36 results about "Exciton dissociation" patented technology

Efficient photovoltaic devices with quantum dots are provided. Quantum dots have numerous desirable properties that can be used in solar cells, including an easily selected bandgap and Fermi level. In particular, the size and composition of a quantum dot can determine its bandgap and Fermi level. By precise deposition of quantum dots in the active layer of a solar cell, bandgap gradients can be present for efficient sunlight absorption, exciton dissociation, and charge transport. Mismatching Fermi levels are also present between adjacent quantum dots, allowing for built-in electric fields to form and aid in charge transport and the prevention of exciton recombination.

The invention relates to a solar cell with a small organic molecule mixture heterojunction, which comprises a transparent insulating layer, wherein a transparent electrode layer, a first buffer layer, a first photosensitive layer, a second photosensitive layer, a third photosensitive layer, a second buffer layer and a high-reflectivity electrode layer are sequentially laminated at one side of the transparent insulating layer; and a lower transition layer is formed at the other side of the transparent insulating layer. The mixture heterojunction and the lower transition layer are combined together, so that the solar spectrum utilization ratio of the organic solar cell and exciton dissociation efficiency can be improved; meanwhile, the high-reflectivity electrode is reasonable utilized, the optical field distribution in the device can be adjusted, therefore, the solar cell can work at an optimum state. The invention also relates to a preparation method of the solar cell.

The present invention relates to an organic photoelectric detector with high external quantum efficiency and a broad spectral response. The organic photoelectric detector provided by the invention comprises the followings connecting in order: a lower conversion layer, a substrate, an anode, an electron injection barrier layer, an electron-transporting layer, an active layer and a cathode. The thickness of the electron injection barrier layer is from 1 nm to 10 nm, the thickness of the electron-transporting layer is from 5 nm to 60 nm, the thickness of the active layer is from 5 nm to 200 nm, and the thickness of the cathode is from 50 nm to 1000 nm. According to the invention, a relatively high photoelectric multiplication effect (EQE>15000%) is realized as well by means of improving the electron tunneling injection at electrodes through employing holes after exciton dissociation, and the structure provided by the invention is fully beneficial to an organic photoelectric detection device realizing a broad spectral response.

The invention relates to a polymer solar battery and a preparation method of the polymer solar battery. The polymer solar battery comprises an anode substrate, a cavity buffer layer, an active layer and a metal cathode which are sequentially stacked, and also comprises an inorganic layer arranged between the active layer and the metallic cathode.\The polymer solar battery comprises the active layer/ inorganic layer structure, the distribution of an optical field in the active layer can be improved, so that a generating region of a carrier is changed, a good place is provided for exciton dissociation, and meanwhile, the transmission efficiency of the carrier is improved; and a contacting interface of the active layer and the cathode is separated, so that metal atoms are prevented from diffusing to the active layer to further destroy the structure of the active layer, the role of a buffering layer is played, and the collection efficiency of electrons at the position of the electrode is improved.

The invention discloses an ordered heterojunction photovoltaic device and a preparation method thereof. the ordered heterojunction photovoltaic devices includes a negative layer, an interface modification layer, a photovoltaic active layer, a hole barrier layer, a positive electrode layer and a substrate from top to bottom, wherein the photovoltaic active layer comprises an organic layer and an inorganic layer, wherein the inorganic layer is an ordered nanorod array perpendicular to the substrate, the organic layer fills and covers the nanorod array, the top surface of the organic layer is parallel to the substrate, and the nanorod height in the nanorod array is 300-500 nm, and the diameter is 50-100 nm, and the distance between the nanorods is 60-80nm, the nanorod array and the organic layer of the invention intersect each other to form an ordered network structure, The photogenerated exciton dissociation surface can be ensured to be large, and the electrons and holes generated by thedissociation can be transported in the two transmission channels respectively, so that the hopping transmission of the carriers between the donor material particles and the acceptor material particles is avoided, the charge recombination probability is effectively reduced, and higher photoelectric conversion efficiency can be obtained.

The invention belongs to the technical field of organic photovoltaic devices or organic semiconductor film solar cells, and particularly relates to an active layer used for a ternary blending solar cell and application of the active layer. In the active layer, high-crystallinity P3HT serves as a donor, micromolecular DPP4T-Cz serves as a second donor, and a fullerene derivate PC61BM serves as an acceptor. Under the condition that the active layer is relatively thick, a good carrier transport capacity of the cell is ensured, the carrier recombination efficiency is reduced, a good exciton dissociation efficiency is obtained, and the optical absorption range is enpanded.

The invention discloses a non-fullerene electron acceptor material and a preparation method and application thereof. The star-shaped non-fullerene electron acceptor material is obtained by taking an electron donating structure as a central core unit and a five-membered fused ring as an arm unit, and blocking a terminal group by using electron withdrawing groups such as 3-(dicyanomethylene) indanone and derivatives thereof. The material not only maintains the advantages of a linear non-fullerene electron acceptor material, but also has high electron mobility and isotropic charge transfer characteristics of a fullerene electron acceptor material, and the multidimensional geometric structure of the material is beneficial to intramolecular charge transfer, so that the energy gap is reduced and the absorption range is expanded, and the star-shaped multi-dimensional structure can effectively inhibit excessive aggregation and is beneficial to exciton dissociation. The material can be used as an electron acceptor material of an active layer to be widely applied to preparation of organic solar cells, and excellent material film stability and excellent photoelectric conversion characteristics can be obtained.

The invention discloses a fluorine and rubidium doped perovskite solar cell and a preparation method thereof. The solar cell comprises a substrate, a conductive layer, a TiO2 dense layer, a TiO2 mesoporous layer, a fluorine and rubidium doped perovskite light absorbing layer, a hole transport layer and a counter electrode from bottom to top, wherein the material of the fluorine and rubidium dopedperovskite light absorbing layer is Cs1-xRbxPbBrI2-yFy, x is 0-0.05, y is 0-0.3, and the thickness is 300-500nm. The preparation method includes the following steps of: A, preparation of the conductive layer; B, preparation of the TiO2 dense layer and the TiO2 mesoporous layer; C, preparation of the fluorine and rubidium doped perovskite light absorbing layer; D, preparation of the hole transportlayer; and E, preparation of the counter electrode. According to the scheme of the invention, the spectral absorption performance of the light absorbing layer and the overall efficiency of a battery can be improved; the battery performance attenuation speed can be greatly reduced; the exciton dissociation and charge transfer can be facilitated, and can be relatively stable in the later battery attenuation; and without packaging, the solar cell can be used in higher water oxygen content and has good intrinsic stability.

The invention belongs to the field of organic photovoltaic cells, and particularly relates to an organic small-molecule photovoltaic device based on a three-terminal electrode structure. The organic small-molecule photovoltaic device comprises an ITO layer serving as a first electrode layer, an organic small-molecule donor connected with a conductive face of the ITO layer, an organic small-molecule receptor connected with the other face of the organic small-molecule donor, a second electrode layer connected with the other face of the organic small-molecule receptor, a dielectric layer connected with the other face of the second electrode layer, and a third electrode layer connected with the other face of the dielectric layer, the first electrode layer is connected with a negative electrode of a direct-current voltage source, the third electrode layer is connected to a positive electrode of the direct-current voltage source, and the first electrode layer and the second electrode layer serve as output ends. According to the device, due to the fact that a potential is applied to the two ends of the organic small-molecule photovoltaic device, a strong electric field can be formed in the organic small-molecule photovoltaic device, the exciton disassociation efficiency is improved, and the energy conversion benefit of the organic small-molecule photovoltaic device is improved.

The invention belongs to the organic photoelectric material and organic ultraviolet light detector field and relates to an organic ultraviolet light detector taking HATCN and a Cu (I) complex prepared by the HATCN as an anode buffer layer. A structure of the detector sequentially comprises an ITO anode, an anode buffer layer, an electron donor layer, a mixed donor and acceptor layer, an electron acceptor layer, an electron injecting layer and a cathode. The detector is characterized in that the HATCN and the Cu (I) complex prepared by the HATCN have relatively high electron mobility and relatively good film forming ability and stability, electrons are facilitated through quite low LUMO energy level to shuttle among HOMO energy levels of the anode and the donor, so the electrons and excitons can realize rapid dissociation to form cavity composition, cavity transmission is further facilitated by charge composition mechanism, and thereby performance of the detector is improved. According to the detector, by employing the material of the anode buffer layer, performance of the organic ultraviolet light detector is greatly improved, aging of the organic ultraviolet light detector is slowed down, and stability of the organic ultraviolet light detector is improved.

The invention relates to a preparation method of a two-dimensional transverse polymer heterojunction visible-light response catalytic hydrogen production material and application thereof. A phenanthrene polymer semiconductor plane is grafted to a graphite phase carbon nitride plane through a high-temperature thermo-polymerization method; as a phenanthrene polymer semiconductor is matched with a graphite phase carbon nitride semiconductor energy band to form a heterojunction structure, and a built-in field is formed at a boundary of heterojunctions to promote dissociation of light excitons, thephotocatalytic performance of a graphite phase carbon nitride material is improved; meanwhile, both the phenanthrene polymer semiconductor and graphite phase carbon nitride are visible-light responsecatalysts and are polymer conjugate materials; a pi-pi conjugate exists along a heterojunction plane, so that photon-generated carriers can be transmitted faster in a pi-pi conjugate system, and thetwo-dimensional polymer heterojunction material achieves higher light exciton dissociation efficiency and carrier transmission rate. The method has the advantages of a simple process, low cost, shortperiod, visible-light response and the like, and the finally formed two-dimensional transverse polymer heterojunction photocatalytic material is excellent in photocatalytic hydrogen production performance.

The present invention discloses a quantum dot light-emitting diode device and a preparation method thereof. The device comprises a substrate, a bottom electrode, a hole injection layer, a hole transmission layer, a quantum dot luminescent layer, an electron transfer layer, an electron injection layer and a top electrode in order. The quantum dot luminescent layer at least has one surface provided with a plurality of periodically distributed grooves. Periodically distributed grooves are arranged in the luminescent layer to add the contact areas between the carrier transportation layer and the quantum dot luminescent layer materials so as to improve the efficiency of the carrier injection quantum dot luminescent layer; the transmission obstruction of the between the carriers between the quantum dots to allow more excitons to perform direct injection through the carriers or perform migration formation between short quantum dot; the quantum dot light-emitting diode device and the preparation method thereof can reduce the effect of exciton dissociation between the quantum dots; the quantum dot light-emitting diode device and the preparation method thereof can reduce the formation of lots of exciton-carrier three-body structure caused by carrier injection and imbalance transmission and reduce the exciton quenching; and moreover, the quantum dot light-emitting diode device and the preparation method thereof can employ the raster coupling principle to add the optical coupling of the diode and the emission efficiency.

The invention discloses an amphipathic conjugated polymer and a production method and application thereof. The polymer is a naphthalene diimide polymer derivative which is obtained through copolymerization of naphthalene diimide (NDI), dibenthiophene and amphipathic group-substituted dibromonaphthalene diimide. By introducing an amphipathic group, without having large effects on spectral absorption and energy level alignment, the polymer is applied as an organic solar cell material active layer material or an adding component, a donor-acceptor ratio of an active layer does not need to be changed, the micro-phase separation state can be effectively adjusted, the exciton dissociation efficiency can be improved, and molecular orientation can be enhanced, so that the photoelectric conversion efficiency of an organic photovoltaic device is significantly improved.

The invention provides a lorentz force based novel polymer solar cell preparation method. The preparation method comprises the following steps of sputtering an indium-tin oxide positive electrode (2) on a glass substrate (1), and performing spin-coating on a hole transport layer (3); enabling a layer of 40-60nm neodymium-iron-boron magnetic materials (4-1) to be grown in a strong magnetic field, and performing photoetching to form strip-shaped patterns (4-1), wherein the strip-shaped direction is perpendicular to the magnetic field direction; enabling polymer light-sensitive layer materials (4-2) which are formed by co-mixing of a donor and a receptor to be dispensed or printed between the strip-shaped patterns (4-1) which are formed by photoetching, and forming a lorentz force light-sensitive layer (4) based on alternative growth of the magnetic materials and the strip-shaped light-sensitive materials; and performing spin-coating on an electron transport layer (5) and evaporating an aluminum negative electrode (6). According to the preparation method, the mutual alternative growth mode of the magnetic materials and the strip-shaped light-sensitive materials is established; the directions of the magnetic fields formed by every two strip-shaped magnetic materials are consistent, so that the movement of electrons to the direction of the negative electrode, and the movement of holes to the direction of the positive electrode are reinforced; therefore, the transport of electrons and holes to the transport layer after exciton dissociation can be promoted; the exciton recombination is reduced; the thickness of the light-sensitive layer is increased; and the improvement of the photoelectric conversion efficiency of the polymer solar cell is facilitated.

The invention relates to a diphenylamino-truxene-BODIPY derivative ternary system organic dye as well as a preparation method and application thereof. A 3-site and 5-site modified BODIPY derivative and a diphenylamine derivative are respectively connected to 2, 7 and 12 sites of truxene through covalent bonds through a chemical reaction to construct a D-A-pi-D molecular system, introduction of diphenylamine is beneficial to pi electron delocalization, intramolecular charge transfer is promoted, so that the photoelectric conversion efficiency of organic dye molecules is improved; the organic dye provided by the invention has strong light absorption capability, and can effectively perform exciton dissociation; the synthesis method provided by the invention is simple, mild in reaction condition, relatively good in selectivity and small in environmental pollution; when the organic dye is used in an organic solar cell, a good effect is obtained, and the photoelectric conversion efficiency can reach 13.32%; and the organic dye can be used in the field of solar cells.

The invention relates to a bipolar organic field effect transistor. The bipolar organic field effect transistor comprises a substrate, a gate, a gate dielectric layer, an N-type active layer, a P-typeactive layer, a source and a drain, wherein the N-type active layer and the P-type active layer are arranged side by side in a cross mode among the source, the drain and gate dielectric layer to forma vertical laminated structure. The vertical laminated structure can make exciton dissociation at the interface between the N-type active layer and the P-type active layer sufficient so as to improvethe carrier mobility of electrons and holes in the organic bipolar field effect transistor. Therefore, the bipolar organic field effect transistor effectively improves the performances of the bipolarorganic field effect transistor.

The invention discloses a narrow-band gap conjugated polymer based on benzobithiophene diazole and tellurophene and application of the narrow-band gap conjugated polymer in a self-driven short-wave infrared response organic photoelectric synapse flexible device. The narrow-band-gap polymer is good in solubility, the spectral absorption range covers a visible light area, a near-infrared band and a part of short-wave infrared bands, close packing of molecules is promoted through tellurium-tellurium interaction between polymer chains, and therefore the narrow-band-gap polymer has a high dielectric constant and is beneficial to photogenerated exciton dissociation. And meanwhile, due to the extremely unbalanced hole and electron transmission capability of the polymer, electrons which are relatively slowly transmitted become trap centers, so that holes of an external circuit continuously tunnel and are injected into a device, and a photoconductive effect is generated. The short-wave infrared response organic photoelectric synapse two-end flexible device prepared on the basis of the mechanism can work without external bias voltage, simulates multiple nerve synapse behaviors, and achieves a good effect.