178 results about "Carrier lifetime" patented technology

The invention discloses an online defect detection method for a main-grid-free photovoltaic cell panel, which comprises the following steps of: obtaining a life distribution diagram of a main-grid-free photovoltaic cell through time-resolved photoluminescence, and obtaining a heat dissipation diagram of the main-grid-free photovoltaic cell through optically-induced phase-locked thermal imaging; an ultrasonic diagram of the main-grid-free photovoltaic cell is obtained through laser ultrasound; preprocessing and registering the life distribution diagram, the heat dissipation diagram and the ultrasonic diagram so as to uniformly map the life distribution diagram, the heat dissipation diagram and the ultrasonic diagram to a cell coordinate system, extracting minority carrier life, heat dissipation power, ultrasonic propagation time delay offset and scattering energy, and forming a multi-modal feature together with a thermal phase; and based on the abnormal score, performing defect detection and classification on the multi-modal features of the possible defect area to obtain classification results of electrical defects, thermal defects and mechanical defects. The invention also discloses a system for realizing the method. According to the invention, full-coverage detection of electrical, thermal and mechanical defects is realized.

The invention discloses a high-voltage fast recovery diode with a positive temperature characteristic and a manufacturing method of the high-voltage fast recovery diode. A central region of the device is a P-type doped active region which is used as an anode when the device works in the forward direction; p-type doped field limiting rings are arranged on the two sides of the active region and serve as voltage dividing rings of the device, and the field limiting rings and the active region are doped independently; an N-type doped cut-off ring is arranged on the outermost periphery of the device and provides an electric field cut-off effect; a metal field plate is arranged above each field limiting ring to improve the distribution of a peripheral electric field and improve the stability of the device; except for the position of the contact hole, CVD, silicon nitride and polyimide in the vertical direction of the device are used as passivation layers of the device to isolate the influence of external moisture, charges and the like, so that the reliability of the device is improved; metal is directly deposited above the active region to serve as an anode of the device; and a layer of metal is evaporated on the back of the device after being thinned to serve as a device cathode. A platinum diffusion and electron irradiation process is used as a minority carrier lifetime control technology to adjust the temperature characteristic of the device.

The invention relates to the technical field of organic compound solar cells, and provides a large-size perovskite assembly pre-illumination synergistic aging test system and method, and the system comprises a light attenuation subsystem, a current-voltage test subsystem, and a control and region light supplement array subsystem. The method comprises the following steps: the light attenuation subsystem obtains the physical and chemical state change of the perovskite component through processing dual-band cooperative irradiation; the current-voltage test subsystem calculates the variance of the carrier lifetime to obtain a performance uniformity evaluation result of the perovskite assembly; a performance uniformity evaluation result forms a PID algorithm output signal through the control subsystem; the control subsystem processes a PID algorithm output signal to obtain an LED intensity adjusting signal for each light supplementing area; lED intensity adjusting signals pass through the area light supplementing array subsystem to form a uniform illumination environment, and a compensated perovskite component surface light field is obtained. According to the invention, a multi-parameter coupled accelerated aging platform is provided for the reliability research of the perovskite component.

The embodiment of the invention relates to a solar cell, a preparation method thereof and a photovoltaic module. The preparation method of the solar cell comprises the steps of providing a substrate; the substrate is provided with a first surface and a second surface which are arranged oppositely; forming a passivation layer on at least one side of the first surface and the second surface of the substrate; under a normal temperature condition, carrying out first light treatment by adopting a light beam with a first wavelength; the minority carrier lifetime in the substrate after the first light treatment is greater than or equal to 2000 [mu] s.

The invention discloses a solar cell and a photovoltaic module, which are used for realizing light trapping, electric leakage prevention, minority carrier lifetime prolonging and cell efficiency improving. Comprising a silicon substrate, a first doped semiconductor layer, a second doped semiconductor layer and a passivation layer, the silicon substrate has a first surface, a second surface and a side surface. The first surface has a pyramid structure, and the side surface comprises a first region and a second region which are sequentially distributed; the first region is adjacent to the first surface and the second region is adjacent to the first region. The second region is recessed into the silicon substrate by a first distance relative to the first region; the first doped semiconductor layer and the second doped semiconductor layer with opposite conduction types are respectively arranged on the first surface and the second surface; the passivation layer is arranged on the first surface, the second surface and the side surface; the second surface comprises groove regions and doped regions which are alternately arranged, and the groove regions are recessed towards the silicon substrate by a second distance relative to the doped regions; the second doped semiconductor layer is located in the doped region, and the passivation layer is located in the trench region and the doped region; wherein the first distance is greater than or equal to the second distance.

The invention belongs to the technical field of solar cells, and particularly discloses a texturing additive, a texturing solution and a texturing method of a back contact cell. The texturing additive for the back contact battery comprises the following components in percentage by mass: 1.0%-5.0% of sodium carboxymethyl cellulose, 0.03%-0.2% of sodium lignin sulfonate, 0.003%-0.03% of paeoniflorin, 0.005%-0.05% of salvianolic acid B, 0.001%-0.01% of polyhexamethylene biguanide hydrochloride, 0.3%-1.0% of a buffering agent, 0.01%-0.1% of a surfactant and the balance of water. The components interact with each other, and the texturing additive is added into the texturing liquid to improve the flatness of the texturing surface and effectively solve the problem that the texturing surface is not fully distributed, so that the minority carrier lifetime and the open voltage of the back contact battery are improved, and the photoelectric conversion efficiency of the battery is improved.

The invention discloses a wide-band-gap perovskite thin film based on interface engineering regulation and control and a preparation method and application thereof. The preparation method comprises the following steps: dissolving 4-hydroxyphenylethyl amine iodide powder in an FA0. 8Cs0. 2Pb (I0. 6Br0. 4) 3 precursor solution to obtain a wide-band-gap perovskite precursor solution with the doping concentration of 0.5-2mol%; the wide-band-gap perovskite thin film is obtained by performing two-step spin coating on the wide-band-gap perovskite precursor solution on a substrate and then performing two-step annealing, and when the wide-band-gap perovskite thin film is applied to a wide-band-gap perovskite solar cell or a laminated wide-band-gap perovskite solar cell, the stability and the performance of a device can be improved. The method is mainly characterized by improving the uniformity of the film, reducing non-radiative recombination, prolonging the service life of current carriers, improving filling factors and current density and improving the photoelectric conversion efficiency. According to the invention, generation of a two-dimensional phase is inhibited, a dipole layer is generated on an interface, energy level matching between a perovskite light absorption layer and an electron transport layer is promoted, interface connection is enhanced, and carrier transport capability is improved.

The invention relates to the technical field of solar cells, in particular to a preparation method of a single-wave precisely doped N-type BC cell. The invention discloses a preparation method of a single-wave precisely doped N-type BC battery. The preparation method comprises the following steps: S1, pre-treating an N-type silicon wafer; s2, performing boron doping on the front surface of the silicon wafer by adopting infrared single-wavelength laser to form a P + shallow junction; performing phosphorus doping on the back surface of the silicon wafer by adopting ultraviolet single-wavelength laser to form an N + region; s3, carrying out single-frequency microwave annealing treatment; s4, preparing a tunneling oxide layer, a boron-doped polycrystalline silicon passivation layer and a surface laminated passivation film; s5, carrying out laser grooving and copper electrode electroplating; s6, cutting the edge of the silicon wafer by adopting single-wavelength femtosecond laser; and S7, low-temperature annealing treatment. According to the method, the doping accuracy is improved, the service life of N-type silicon wafer carriers is ensured, the carrier recombination loss is remarkably reduced, the contact resistance and edge recombination loss is reduced, and the filling factor and the conversion efficiency of the cell are improved.

The application discloses a photovoltaic silicon monocrystal wafer group, a crystal column group, a photovoltaic cell and a photovoltaic module. The wafer group comprises rectangular silicon wafers cut from the middle of a base circle silicon wafer and axisymmetric non-rectangular polygonal silicon wafers symmetrically cut from the periphery of the rectangular silicon wafers. The cutting size of the rectangular silicon wafers is determined according to the distribution of vacancy-type point defect density C V and interstitial-type point defect density C I of the base circle silicon wafer and the distribution of minority carrier lifetime in different radial regions of the base circle silicon wafer, so that the rectangular silicon wafers are located in the region of C V ‑ C I ≥0, and the ratio d of the distance between the four corners of the rectangular silicon wafer and the minimum point of the minority carrier lifetime in the edge region of the base circle silicon wafer to the diameter of the base circle silicon wafer is 2%≤d≤8%. The method is based on the quality distribution rule of the silicon wafer to divide the silicon wafers into two types, and different cell processes are adopted to fully tap the potential of each type, so that the area utilization rate of the base circle silicon wafer is more than 90% while high-quality photovoltaic modules are obtained.

This application provides a passivation structure and its preparation method, as well as a silicon solar cell and its preparation method. The passivation structure includes a first aluminum oxide layer, a first aluminum nitride layer, a second aluminum oxide layer, and a second aluminum nitride layer stacked together. The first aluminum oxide layer directly contacts the silicon edge and repairs cutting damage and dangling bonds through chemical passivation. It adapts to the p-type silicon region with a negative fixed charge. The first aluminum nitride layer passivates the n-type silicon with a positive fixed charge. The high hydrogen content enhances defect repair, and the dense structure blocks impurities from intruding. The second aluminum oxide layer supplements the negative charge to improve the passivation effect of the p-type silicon and forms stress complementarity with the aluminum nitride layer to prevent film cracking. The second aluminum nitride layer resists stringing and lamination damage, blocks moisture and corrosion, and ensures long-term performance. This structure achieves optimal simultaneous passivation of p / n-type silicon through charge complementarity and synergistic hydrogen passivation, improving the minority carrier lifetime at the cell edge, the implicit open-circuit voltage, and the module power, and solving the pain points of incomplete passivation and poor stability.

The invention relates to the technical field of photovoltaic cells and materials thereof, and discloses a crystalline silicon wafer for preparing a crystalline silicon photovoltaic cell, a silicon ingot and a laminated photovoltaic cell. The crystal silicon wafer has one of the following characteristics: 1) the crystal silicon wafer is a lithium crystal silicon wafer of lithium-doped silicon; and 2) the crystal silicon wafer is an alloy crystal silicon wafer, the alloy crystal silicon wafer comprises a substrate, an alloy area containing silicon, tin and germanium alloy elements is locally prepared on the substrate, the alloy crystal silicon wafer is formed, and the alloy area of the alloy crystal silicon wafer comprises the following alloy elements in percentage by atomic number: 5-53% of silicon, 2-12% of tin and the balance of germanium. Compared with the prior art, the current output potential is improved, the photoelectric conversion efficiency is improved, lithium in the lithium crystal silicon wafer effectively passivates defects in crystalline silicon, the minority carrier lifetime of the crystalline silicon is prolonged, the mobility of the crystalline silicon is improved, a better lithium interface passivation effect is achieved, and the function of resisting the ultraviolet induced degradation effect is achieved.

The invention discloses a silicon carbide epitaxial wafer for inhibiting irradiation induced defects, a preparation method and application, and belongs to the technical field of semiconductor materials, the silicon carbide epitaxial wafer comprises an n-type or p-type silicon carbide wafer as a substrate, and an epitaxial layer doped with group IV atoms is epitaxially grown on the substrate. The preparation method comprises the following steps: cleaning an n-type or p-type silicon carbide wafer; placing the cleaned silicon carbide wafer in epitaxial growth equipment and keeping a vacuum environment; raising the temperature of the vacuum environment, and introducing monosilane, propane, nitrogen / hydrogen carrying trimethyl aluminum and gas containing at least one atom of germanium, tin and lead after the temperature is stable; and growing an epitaxial layer on the silicon carbide wafer. The silicon carbide epitaxial wafer is used for producing an anti-radiation silicon carbide power device. According to the invention, generation of carbon vacancies in a silicon carbide device in an irradiation process and minority carrier lifetime degradation caused by the generation of the carbon vacancies can be effectively inhibited, so that the reliability of the silicon carbide epitaxial wafer and a power device thereof under particle irradiation application is improved.

Device for controlling at least one light-emitting diode (LED1) to generate short light pulses (LP),- with an H-bridge (H) consisting of a first half-bridge (HB1: T1, T2) with a first transistor (T1) and a second transistor (T2) and a second half-bridge (HB2: T2, T3) with a third transistor (T3) and a fourth transistor (T4),- wherein the H-bridge (H) is controlled by a control unit (ST) and- wherein the H-bridge (H) can be operated by the control unit (ST) in pulsed mode (GPB) and in quasi-continuous mode (QDB) and- wherein the first half-bridge (HB1: T1, T2) is supplied with electrical energy from a first positive supply voltage (VCC1) and a first negative supply voltage (GND1) and- wherein the second half-bridge (HB2: T3,T4) is supplied with electrical energy from a second positive supply voltage (VCC2) and a second negative supply voltage (GND2) and- wherein the light-emitting diode (LED1) is connected with its cathode (K) to the output of the first half-bridge (HB1: T1, T2) and- wherein the light-emitting diode (LED1) is connected with its anode (A) to the output of the second half-bridge (HB2: T3, T4) and- wherein the first positive supply voltage (VCC1) and the second positive supply voltage (VCC2) can be equal and- wherein the first negative supply voltage (GND1) and the second negative supply voltage (GND2) can be equal and- wherein the light source, in particular the one or more light-emitting diodes (LED1), represents the load of the H-bridge (H) between the output of the first half-bridge (HB1: T1, T2) and the output of the second half-bridge (HB2: T3, T4) and- wherein the control device (ST) is designed to operate in pulsed mode (GPB) a “PAn” condition,in which a forward voltage in the forward direction of the light-emitting diode (LED1) is applied to the light-emitting diode (LED1) through the H-bridge (H), is not maintained by the H-bridge (H) for longer than a turn-on time (τpp), and- wherein the control device (ST) is designed so that in pulsed operation (GPB) a "PAus" state, in which a reverse voltage against the forward direction of the light-emitting diode (LED1) is applied to the light-emitting diode (LED1) through the H-bridge (H), is not maintained by the H-bridge (H) for longer than a clearing time (τpn), and- wherein the clearing time (τpn) is less than the charge carrier lifetime (τ) in the PN junction of the light-emitting diode (LED1), and- wherein the turn-on time (τpp) is less than the charge carrier lifetime (τ) in the PN junction of the light-emitting diode (LED1).

The invention provides a photoconductive switch of a comb electrode, which comprises a semi-insulating gallium arsenide substrate layer, a low-temperature gallium arsenide layer and an insulating protective layer, and is characterized in that the low-temperature gallium arsenide layer is formed on the semi-insulating gallium arsenide substrate layer, and the insulating protective layer is arranged on the low-temperature gallium arsenide layer; a switch anode and a switch cathode are respectively formed on the inner side of the low-temperature gallium arsenide layer surface insulation protection layer; a comb-shaped electrode is arranged on the surface of the low-temperature gallium arsenide layer and located at the switch anode. According to the invention, by arranging the comb-shaped electrode structure, a plurality of comb-tooth electrodes which are distributed in a staggered manner are formed in the electrode region, so that the action area of incident light and a semiconductor active region is increased under an illumination condition, and generation and collection of photon-generated carriers are facilitated; meanwhile, the distribution state of an electric field near the electrode is improved, and the possibility of local electric field concentration is reduced; in addition, a low-temperature gallium arsenide material is adopted as the photoconductive layer, the service life of a current carrier is short, and the device is suitable for photoelectric trigger application scenes with requirements for response speed and stability.

A kind of tin lead perovskite photodetector based on introducing guanidinium ion and strontium ion and preparation method thereof, belong to perovskite photoelectric device technical field.The photodetector described in the application is composed of ITO conductive glass anode, PTAA anode buffer layer, tin lead perovskite film introducing guanidinium ion and strontium ion, C 60 / BCP cathode buffer layer, Cu cathode from bottom to top. + When A-site cation is doped with ion in perovskite, the carrier lifetime of perovskite material can be improved, and the open-circuit voltage of the device can be improved, the carrier diffusion length can be increased, the defects can be reduced, and the stability of the device can be improved;Sr 2+ Doping with ion in B-site of perovskite can increase conductivity, improve stability and optimize electrode performance, ultimately achieve the effect of passivating defects, reducing the capture of electrons by traps and improving photoelectric conversion efficiency, and the optimization effect mainly reflects on light and dark current and external quantum efficiency, and a high-performance photodetector is obtained.

The utility model discloses back contact solar cell and photovoltaic module. The back light surface of back contact solar cell forms the P area, N area and the interval area between both of them of alternate distribution, the back light surface includes central region and edge area, the area ratio of N area in central region is less than the area ratio of N area in edge area, the area ratio of interval area in central region is greater than the area ratio of interval area in edge area. Therefore, can enhance the edge passivation effect of back contact solar cell to prolong the minority carrier lifetime of edge area, reduce the recombination loss of edge area, improve the passivation uniformity of battery whole, and then be favorable to the promotion battery's efficiency.

The invention provides a neural network training method and device, equipment and a medium, and the method comprises the following steps: 1, obtaining training data of an image, voice or text type, and carrying out the normalization and feature extraction processing; according to the invention, the three-terminal two-dimensional photoelectric synapse device is prepared, a single / double input mode is supported, cooperative regulation and control of an optical pulse sequence and a grid electric signal sequence are realized, the problem that the multi-mode processing capability of a traditional double-terminal device is limited is solved, and the complex feature extraction efficiency is improved; the nonvolatile storage of synaptic weight is realized through the ferroelectric regulation and control layer, and the remanent polarization of the ferroelectric regulation and control layer is Prgt; 5 [mu] C / cm < 2 > and erasing durability gt; 106 cycles are carried out, continuous power supply is not needed, and training power consumption and cost are reduced; through the high carrier mobility (gt, 200cm < 2 > / Vs) and nanosecond-level photoresponse characteristics (carrier lifetime lt, 10ns) of the two-dimensional photosensitive layer (such as MoS2 / WSe2), the response speed of the device is increased to nanosecond level, and the training requirement of a high-speed neural network is met.

The invention provides a monocrystalline silicon wafer and a solar cell, and belongs to the technical field of solar cells. The monocrystalline silicon wafer is doped with oxygen elements, and the total content range of the oxygen elements is 8 * 10 < 11 > atoms / cm < 3 >-2 * 10 < 18 > atoms / cm < 3 >. The monocrystalline silicon wafer is also doped with at least one of a third main group element and / or a fifth main group element, and the total content of the third main group element and the fifth main group element is less than the total content of the oxygen element. The monocrystalline silicon wafer provided by the invention has relatively long minority carrier lifetime, and when the monocrystalline silicon wafer is applied to a solar cell, the solar cell with high photoelectric conversion efficiency can be obtained.

The invention discloses a wide-band-gap perovskite solar cell and a full-perovskite laminated solar cell. Methyl ammonium bromide and guanidine bromide are jointly doped into the perovskite precursor solution to partially replace formamidine iodide, and a multi-element A-site alloy structure is introduced into the perovskite solar cell, so that defects in a perovskite layer are reduced, the service life of a carrier is prolonged, surface non-radiation is inhibited, the voltage loss of a device is reduced, and the performance of the device is improved. Therefore, the performance of the perovskite solar cell is obviously improved.

The invention relates to the technical field of solar cells, and provides a silicon wafer gettering method, a silicon wafer, a cell, a preparation method, an assembly and a photovoltaic system, and the method comprises the steps: determining an impurity-containing silicon wafer from a plurality of silicon wafers produced by a crystal pulling furnace; the impurity-containing silicon wafers are silicon wafers of which the minority carrier lifetime is smaller than the mean value of the minority carrier lifetime of the silicon wafers; and gettering the impurity-containing silicon wafer to absorb impurities in the silicon wafer. Therefore, impurities in the silicon wafer can be reduced, the minority carrier lifetime of the silicon wafer is prolonged, and the photoelectric conversion efficiency of the cell is improved.

This invention relates to the field of optical inspection technology, specifically to a micro LED wafer-level rapid defect localization system based on photoluminescence. A broadband pulse excitation module outputs pulsed laser light matching the characteristics of the material under test; a two-dimensional scanning platform carries the wafer and achieves nanometer-level precise positioning; a time-resolved acquisition module collects fluorescence signals and converts them into time-resolved photoluminescence data; a data processing and control module synchronously controls the operation of each module, receives and processes the time-resolved photoluminescence data, extracts the transient luminescence intensity and carrier lifetime of each detection point, compares the two-dimensional feature vector formed by these two parameters with a preset defect feature database, identifies the defect type of each micro LED chip, and generates a wafer-level defect fingerprint spectrum. This system can accurately distinguish different types of failure modes such as epitaxial defects, surface state defects, and poor electrode contact, significantly improving detection efficiency and defect classification accuracy.

The present invention discloses a field plate terminal structure with single particle radiation reinforcement and a preparation method thereof, belonging to the field of microelectronics technology. The structure includes a substrate, an epitaxial layer, a device main junction region and a carrier lifetime control region, a field oxide layer, an anode, a field plate, which is arranged on the field oxide layer, and a cathode, wherein the anode is in contact with the field plate; the carrier lifetime control region is located in the region of the field plate corresponding to the epitaxial layer. The present invention reduces the number of hole carriers moving to the edge of the main junction by introducing a carrier lifetime control layer (i.e., the carrier lifetime control region) on the upper surface layer of the semiconductor material in the terminal region, thereby alleviating the current density and heat accumulation at the edge of the main junction and improving the SEB resistance of the field plate terminal structure.

The invention discloses a method for monitoring metal pollution in an ion implantation process by using PFG and a PFG metal pollution monitoring system of an ion implanter. The method comprises the following steps: providing a P-type semiconductor wafer, and carrying out ion implantation and annealing treatment on the P-type semiconductor wafer; adopting a plasma gun as an electron source to neutralize positive charges on the surface of the P-type semiconductor wafer in ion implantation treatment; and measuring the diffusion length of a carrier of the P-type semiconductor wafer, calculating the service life of the carrier according to the diffusion length, and outputting a PFG metal pollution degree result. The SPV method is adopted, and the service life of the carriers is calculated by measuring the diffusion length of the carriers in the silicon crystal, so that the PFG metal pollution degree is monitored, the PFG metal pollution condition of the ion implanter can be monitored efficiently and accurately, process parameters are adjusted in time, and the manufacturing quality of semiconductor devices is ensured.

This application relates to the technical field of solar cells, and provides a method, device, and storage medium for determining the minority carrier lifetime of a solar cell. The method includes: determining the open-circuit voltage decay data of the solar cell according to the grayscale value image of the solar cell; the open-circuit voltage decay data refers to the difference between the first open-circuit voltage and the second open-circuit voltage; the first open-circuit voltage is the open-circuit voltage when the solar cell is irradiated with a light source; the second open-circuit voltage is the open-circuit voltage after the photogenerated carriers excited by the light source neutralize the charges on the surface of the solar cell; determining the minority carrier lifetime of the solar cell according to the open-circuit voltage decay data. Thus, it is possible to test the minority carrier lifetime on the surface of the solar cell when there are charges on the surface of the solar cell.

The application relates to the field of photovoltaic technology and discloses a passivated contact solar cell and a preparation method thereof. The preparation method comprises the following steps: providing a substrate layer with opposite first and second surfaces; forming an oxide layer on the first surface of the substrate layer; performing laser sintering treatment on the surface of the oxide layer; forming a first doped layer on the oxide layer after the laser sintering treatment; forming a second doped layer on the second surface of the substrate layer; forming a first electrode connected with the first doped layer on the first surface side of the substrate layer; and forming a second electrode connected with the second doped layer on the second surface side of the substrate layer. In the application, the laser sintering treatment on the oxide layer realizes accurate optimization of the surface of the oxide layer, improves the surface and interface characteristics, further reduces the surface recombination rate of the oxide layer and the substrate layer and the first doped layer, improves the carrier lifetime, and thus the photoelectric conversion efficiency and stability of the cell are improved, and the power generation efficiency is improved.

The invention discloses a TiO2 composite photo-anode material based on ZIF-8 and MXene synergistic modification and a preparation method of the TiO2 composite photo-anode material. The material comprises an FTO conductive substrate, a vertically arranged TiO2 nanowire array, an in-situ grown ZIF-8 pore structure layer and an MXene two-dimensional conductive sheet layer spin-coated and loaded on the surface of the ZIF-8 pore structure layer, and a TiO2 / ZIF-8 / MXene multi-layer composite heterostructure is constructed and formed. The preparation method sequentially comprises the steps of FTO substrate cleaning, hydrothermal synthesis and annealing of the TiO2 nano array, in-situ growth of ZIF-8, spin-coating loading of MXene and annealing treatment. According to the material, space separation channel design of electrons and holes is achieved, the service life of photon-generated carriers is remarkably prolonged, the migration efficiency of the photon-generated carriers is remarkably improved, and compared with original TiO2, the light current density, the interface charge transfer impedance, the carrier concentration and the stability of the composite photo-anode material are remarkably improved.

The invention relates to the technical field of photovoltaic cells, in particular to a back contact crystalline silicon cell and a preparation method thereof. A back contact crystalline silicon cell comprises a silicon substrate layer, a composite layer, a tunneling oxide layer, a second passivation layer, a composite doped silicon layer and a back electrode layer. A composite layer is arranged on the first surface of the silicon substrate layer; a tunneling oxide layer is arranged on the second surface; a second passivation layer is arranged on the surface of the tunneling oxide layer; a composite doped silicon layer is arranged on the surface of the second passivation layer, and the composite doped silicon layer comprises a first antimony doped layer, a phosphorus-antimony doped layer and a second antimony doped layer which are sequentially stacked in the direction from the silicon substrate layer to the second passivation layer; and a back electrode layer is arranged on the surface of the composite doped silicon layer. According to the back contact crystalline silicon cell, the contact resistivity of the back electrode can be reduced, the service life of a carrier is prolonged, accurate adaptation of the doping structure and the BC interdigital electrode is achieved, back side parasitism is reduced, the preparation process can be simplified, the cost is reduced, and the long-term reliability of the cell and the conversion efficiency of the cell are improved.

According to the gallium nitride-based semiconductor laser with the gradually-changed polarized optical phonon energy waveguide layer, a fitting curve of In ion strength distribution or In atom concentration distribution of an upper waveguide layer and a lower waveguide layer is tested through SIMS, and a fitting curve of polarized optical phonon energy distribution meets any function distribution of Log3P1, Lop2P2 and Biphase. The spatial continuous regulation and control of the phonon energy of the optical field are realized, so that the LO phonon energy is continuously and gradually changed along the propagation direction, the phonon energy gradient is formed, the LO phonon scattering is improved, the inelastic scattering and energy relaxation of carriers and LO phonons are inhibited, the carrier transportation and phonon scattering are optimized, the service life of the carriers and the gain retention time are prolonged, and the optical field performance is improved. According to the invention, the threshold current density is reduced, the thermal stability of the laser is improved, the use power and the use temperature of the laser are improved, meanwhile, the phonon energy valley value is matched with the quantum well gain peak, the scattering loss is inhibited, additional scattering caused by phonon energy mutation is avoided, the light field limitation is enhanced, and the slope efficiency is improved.

The present invention relates to the field of solar cell technology, and discloses a CdTe-based high-efficiency stacked solar cell structure and a preparation method thereof. The cell structure includes a substrate, a first transparent conductive layer is formed on the substrate, a buffer layer is formed on the first transparent conductive layer, a first light absorbing layer is formed on the buffer layer, and a back contact layer is formed on the first light absorbing layer to obtain a cadmium telluride sub-cell; a second transparent conductive layer is formed on the back contact layer, a hole transport layer is formed on the second transparent conductive layer, and a second light absorbing layer is formed on the hole transport layer to obtain a perovskite sub-cell. The TCO layer of the present application optimizes the SnO2 energy band through nitrogen ion implantation, and the first light absorbing layer is gradiently doped with Cl and As to improve the carrier lifetime, thereby achieving a single junction efficiency of >23% and a stacking efficiency of >31%. The fully dry process of the present invention is suitable for the industrial production of glass substrates and is applicable to high-reliability scenarios.

The invention relates to a passivation layer film material for a photovoltaic cell and a preparation method of the passivation layer film material, and belongs to the technical field of photovoltaic cells. The passivation layer is a thin film of a SiNx-TiO2-SiOyNz sandwich laminated structure, SiNx hydrogen passivation and TiO2 field effect shielding are carried out, the interface state density is remarkably reduced, the service life of a device carrier is prolonged, the gradient oxygen-nitrogen ratio of SiOyNz is regulated and controlled, the fixed charge density is stabilized at the order of magnitude of 1010, the threshold voltage drift defect caused by the high fixed charge density of the traditional SiNx layer is weakened, and the performance of the device is improved. The laminated structure design inhibits the charge injection effect and enhances the dynamic stability, meanwhile, the atomic layer deposition process of a traditional Al2O3 layer is avoided, the passivation process complexity is reduced, the production equipment is simplified, the production efficiency is improved, and a new method is provided for industrial production of photovoltaic devices.