Near-infrared light absorption enhanced semi-transparent organic solar cells and methods of making the same

Abstract

The application provides a near-infrared light absorption enhanced semi-transparent organic solar cell and a preparation method thereof. The cell comprises, from bottom to top, a substrate, an anode, a hole transport layer, an organic active layer, an electron transport layer, a metal top electrode and a near-infrared reflection layer; the hole transport layer is a PEDOT:PSS / gold nanobipyramid film; the organic active layer is a PM6:Y6 film; and the near-infrared reflection layer is a LiF / MoO3 film. The application uses a non-fullerene material Y6 as an acceptor, reduces the proportion of PM6 in the active layer, and increases the visible light transmittance. The gold nanobipyramid is introduced into the hole transport layer, the plasmonic effect is used, the near-infrared band light absorption is increased, the secondary absorption of near-infrared light is realized in combination with the LiF / MoO3 film, the PCE is improved under the premise of maintaining good AVT, and thus the optimal device light energy utilization efficiency is obtained.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of energy saving and environmental protection, in particular to a semi-transparent organic solar cell with enhanced near-infrared light absorption and a preparation method thereof. BACKGROUND

[0002] Organic solar cells (OSCs) have become one of the most promising sustainable photovoltaic technologies due to their low cost, solution processability and flexibility. Non-fullerene acceptors (NFAs) have advantages of good electron mobility, tunable energy levels, and good light absorption in the near-infrared (NIR) region which accounts for more than 50% of solar energy. Organic solar cells based on non-fullerene acceptors have made significant breakthroughs in power conversion, with power conversion efficiency (PCE) higher than 18%.

[0003] Semi-transparent organic solar cells (ST-OSCs) have unique application prospects in self-powered greenhouses and building-integrated photovoltaic devices. Semi-transparent organic solar cells based on non-fullerene acceptors can selectively absorb light in the near-infrared region and allow visible light to pass through the device, thereby achieving high photoelectric conversion efficiency while maintaining good visible light transmittance.

[0004] Most existing semi-transparent organic solar cells achieve high average visible light transmittance (AVT) by adjusting the thickness of the active layer, reducing the proportion of materials with strong absorption in the visible light region, and using ultra-thin top electrodes. However, these strategies reduce the light absorption of the device while improving the visible light transmittance, resulting in low PCE. How to simultaneously improve the PCE and AVT of ST-OSCs, which are two core indicators that are mutually restrictive, remains a key problem to be solved. SUMMARY

[0005] The purpose of the present application is to provide a semi-transparent organic solar cell with enhanced near-infrared light absorption and a preparation method thereof, which can simultaneously improve the PCE and AVT of ST-OSCs, thereby achieving optimal light energy utilization efficiency (LUE) of the device.

[0006] To achieve the above purpose, the present application provides the following solutions:

[0007] The semi-transparent organic solar cell with enhanced near-infrared light absorption comprises, from bottom to top, a substrate, an anode, a hole transport layer, an organic active layer, an electron transport layer, a metal top electrode and a near-infrared reflection layer.

[0008] The hole transport layer is a PEDOT:PSS / gold nanopyramid thin film;

[0009] The organic active layer is a PM6:Y6 thin film; the organic active layer is used to absorb visible light and near-infrared light in sunlight and generate dissociated excitons.

[0010] The near-infrared reflective layer is a LiF / MoO3 film; the near-infrared reflective layer is used to reflect the incident near-infrared light to the organic active layer to enable the organic active layer to perform secondary absorption on the near-infrared light.

[0011] Optionally, the PEDOT:PSS / gold nanobipyramid film has a thickness of 40 nm.

[0012] Optionally, the PM6:Y6 film has a thickness of 110 nm to 130 nm.

[0013] Optionally, the electron transport layer is BCP; the BCP has a thickness of 8 nm.

[0014] Optionally, the substrate is a glass substrate.

[0015] Optionally, the anode is an ITO conductive film.

[0016] Optionally, the metal top electrode is an Au / Ag conductive film.

[0017] A preparation method of the semi-transparent organic solar cell with enhanced near-infrared light absorption, comprising:

[0018] ITO is deposited on the surface of a glass substrate by magnetron sputtering to obtain an ITO conductive film; the glass substrate and the ITO conductive film constitute an ITO substrate;

[0019] The surface of the ITO substrate is cleaned using a cleaning agent, and the cleaned ITO substrate is placed in a high-temperature drying cabinet for drying;

[0020] The dried ITO substrate is placed in an ultraviolet-ozone environment;

[0021] Gold nanobipyramids are doped in an aqueous solution of a conductive polymer PEDOT:PSS to obtain a PEDOT:PSS / nanobipyramid solution;

[0022] The PEDOT:PSS / nanobipyramid solution is spin-coated on the surface of the ITO substrate treated in the ultraviolet-ozone environment to obtain a PEDOT:PSS / gold nanobipyramid film; the ITO substrate and the PEDOT:PSS / gold nanobipyramid film constitute a PEDOT:PSS / gold nanobipyramid substrate;

[0023] A PM6 / Y6 organic donor-acceptor blending solution is obtained according to the mass ratio of an organic donor PM6 and an organic acceptor Y6.

[0024] spin-coating the PM6 / Y6 organic acceptor blended solution on the surface of the PEDOT:PSS / gold nanobipyramidal substrate to obtain a PM6:Y6 film; the PM6:Y6 film and the PEDOT:PSS / gold nanobipyramidal substrate constitute a PM6:Y6 substrate;

[0025] annealing the PM6:Y6 substrate;

[0026] depositing BCP on the surface of the annealed PM6:Y6 substrate under a vacuum environment to obtain BCP; the BCP and the PM6:Y6 substrate constitute a BCP substrate;

[0027] depositing Au / Ag on the surface of the BCP substrate under a vacuum environment to obtain an Au / Ag conductive film; the Au / Ag conductive film and the BCP substrate constitute an Au / Ag substrate;

[0028] depositing LiF and MoO3 on the surface of the Au / Ag substrate under a vacuum environment to obtain a near-infrared reflective layer; the Au / Ag substrate and the near-infrared reflective layer constitute a semi-transparent organic solar cell.

[0029] Optionally, the PEDOT:PSS aqueous solution comprises PEDOT and PSS; the PEDOT is a polymer of 3,4-ethylenedioxythiophene monomer; and the PSS is polystyrene sulfonate.

[0030] Optionally, the cleaning agent comprises deionized water, acetone and isopropyl alcohol.

[0031] According to the specific embodiments of the present application, the following technical effects are provided:

[0032] The application provides a near-infrared light absorption enhanced semi-transparent organic solar cell, which comprises, from bottom to top, a substrate, an anode, a hole transport layer, an organic active layer, an electron transport layer, a metal top electrode and a near-infrared reflection layer; the hole transport layer is a PEDOT:PSS / gold nanobipyramidal film; the organic active layer is a PM6:Y6 film; the organic active layer is used for absorbing visible light and near-infrared light in sunlight and generating dissociated excitons; the near-infrared reflection layer is a LiF / MoO3 film; and the near-infrared reflection layer is used for reflecting the transmitted near-infrared light to the organic active layer so that the organic active layer performs secondary absorption on the near-infrared light. The non-fullerene material Y6 is used as an acceptor in the application, and the light absorption in the near-infrared band is good. By reducing the proportion of PM6 in the active layer, the average visible light transmittance of the device is improved. On this basis, by introducing gold nanobipyramids into the hole transport layer, the light absorption in the near-infrared band is increased by means of the plasmonic effect, and under the premise of not affecting the AVT, a higher PCE is achieved, so that the LUE is improved. Finally, by adding a near-infrared reflection layer at the metal top electrode, the near-infrared light that is not completely absorbed by the active layer is reflected back into the device, so that the secondary absorption of the near-infrared light is realized, and the PCE of the device is further improved, and the optimal LUE is obtained. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described below only show some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0034] Figure 1 The structural diagram of the near-infrared light absorption enhanced semi-transparent organic solar cell of the embodiment of the present application;

[0035] Figure 2 The flowchart of the preparation method of the near-infrared light absorption enhanced semi-transparent organic solar cell of the embodiment of the present application;

[0036] Figure 3 The J-V characteristic curve of the near-infrared light absorption enhanced semi-transparent organic solar cell of the embodiment of the present application;

[0037] Figure 4 The transmittance curve of the semi-transparent organic solar cell with different proportions of the embodiment of the present application;

[0038] Figure 5 The light absorption spectrum of PM6 and Y6 and the extinction spectrum of AuNBPs (gold nanobipyramids) of the near-infrared light absorption enhanced semi-transparent organic solar cell of the embodiment of the present application;

[0039] Figure 6 A comparison chart of the transmittance in the visible light band of the semi-transparent organic solar cell with enhanced near-infrared light absorption according to the embodiment of the present application and the transmittance in the visible light band of a solar cell without a near-infrared reflective layer;

[0040] Figure 7 A comparison chart of the short-circuit current density rate of the semi-transparent organic solar cell with enhanced near-infrared light absorption according to the embodiment of the present application and the short-circuit current density rate of a solar cell without a near-infrared reflective layer.

[0041] Symbol explanation:

[0042] Glass substrate - 1, ITO conductive film - 2, PEDOT:PSS / gold nanobipyramid film - 3, PM6:Y6 film - 4, BCP - 5, Au / Ag conductive film - 6, near-infrared reflective layer - 7. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present application.

[0044] The purpose of the present application is to provide a semi-transparent organic solar cell with enhanced near-infrared light absorption and a preparation method thereof, which can synergistically improve the PCE and AVT of ST-OSCs, thereby obtaining optimal device light utilization efficiency (LUE).

[0045] In order to make the above objectives, characteristics and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0046] As shown in Figure 1 The semi-transparent organic solar cell with enhanced near-infrared light absorption provided by the present application comprises, from bottom to top, a substrate, an anode, a hole transport layer, an organic active layer, an electron transport layer, a metal top electrode and a near-infrared reflective layer.

[0047] The hole transport layer is a PEDOT:PSS / gold nanobipyramid film 3. Specifically, the thickness of the PEDOT:PSS / gold nanobipyramid film 3 is 40 nm. The PEDOT:PSS doped with gold nanobipyramids is used as the hole transport layer. The plasmonic effect of the gold nanobipyramids enhances the light absorption of the device in the near-infrared band.

[0048] The organic active layer is a PM6:Y6 film 4; the organic active layer is used for absorbing near-infrared light in sunlight and generating dissociated excitons. Specifically, the thickness of the PM6:Y6 film 4 is 110 nm to 130 nm. Among them, the acceptor material of the organic active layer is a non-fullerene acceptor material Y6, and this acceptor material has strong light absorption in the near-infrared band, thereby enhancing the photoelectric conversion efficiency of the semi-transparent organic solar cell.

[0049] In addition, the organic active layer uses an organic polymer PM6 as a donor and a non-fullerene small molecule Y6 as an acceptor, the mass ratio is (0.4-1):1.2, and the thickness is 110-130 nm.

[0050] The near-infrared reflective layer 7 is a LiF / MoO3 film; the near-infrared reflective layer 7 is used for reflecting the incident near-infrared light to the organic active layer to enable the organic active layer to absorb the near-infrared light again. Among them, the thickness of LiF is 150 nm, and the thickness of MoO3 is 100 nm.

[0051] The electron transport layer is BCP 5; the thickness of BCP 5 is 8 nm. The substrate is a glass substrate 1. The anode is an ITO conductive film 2. The metal top electrode is an Au / Ag conductive film.

[0052] Specifically, the glass substrate is the substrate. The ITO film is deposited on the surface of the substrate by magnetron sputtering to obtain the ITO conductive film as the anode. The PEDOT:PSS / gold nanobipyramidal film is deposited on the surface of the ITO conductive film by spin coating to obtain the PEDOT:PSS / gold nanobipyramidal film, and the PEDOT:PSS / gold nanobipyramidal film is used as the hole transport layer. The PM6:Y6 film is deposited on the surface of the PEDOT:PSS / gold nanobipyramidal film by spin coating as the organic active layer, and the PM6:Y6 film is used for absorbing sunlight and generating dissociated excitons. The electrons and holes after the dissociation of the excitons pass through the electron and hole transport layers, respectively, and are extracted by the metal top electrode and the anode to form a photoelectric current. The metal top electrode is the cathode of the near-infrared light absorption enhanced semi-transparent organic solar cell.

[0053] The Au / Ag conductive film is a semi-transparent ultra-thin metal top electrode in the near-infrared light absorption enhanced semi-transparent organic solar cell provided by the application. The non-fullerene acceptor Y6 has strong light absorption in the near-infrared band; the gold nanobipyramidal is added to enhance the light absorption in the near-infrared band; the donor material PM6 has strong absorption in the visible light band; the semi-transparent ultra-thin metal top electrode is evaporated; and finally the near-infrared light reflective layer is combined to realize the secondary absorption of the active layer to the near-infrared light, thereby obtaining a high-performance semi-transparent organic solar cell with enhanced near-infrared light absorption.

[0054] As shown in Figure 2 The preparation method of the near-infrared light absorption enhanced semi-transparent organic solar cell provided by the application includes:

[0055] Step S1: ITO is deposited on the surface of a glass substrate by magnetron sputtering to obtain an ITO conductive film; the glass substrate and the ITO conductive film constitute an ITO substrate.

[0056] Step S2: The surface of the ITO substrate is cleaned using a cleaning agent, and the cleaned ITO substrate is placed in a high-temperature drying cabinet for drying.

[0057] Specifically, the cleaning agent includes deionized water, acetone, and isopropyl alcohol.

[0058] Further, the ITO conductive film with a glass substrate is ultrasonically cleaned with deionized water, acetone, and isopropyl alcohol, respectively, and dried in a high-temperature drying cabinet.

[0059] Step S3: The dried ITO substrate is placed in an ultraviolet-ozone environment.

[0060] Specifically, the dried ITO substrate is treated in the ultraviolet-ozone environment for 25 minutes.

[0061] Step S4: Gold nanobipyramids are doped in a conductive polymer PEDOT:PSS aqueous solution to obtain a PEDOT:PSS / nanobipyramid solution.

[0062] Specifically, the PEDOT:PSS aqueous solution includes PEDOT and PSS; PEDOT is a polymer of 3,4-ethylenedioxythiophene monomer; and PSS is polystyrene sulfonate.

[0063] Step S5: The PEDOT:PSS / gold nanobipyramid solution is spin-coated on the surface of the ITO substrate treated in the ultraviolet-ozone environment to obtain a PEDOT:PSS / gold nanobipyramid film; the ITO substrate and the PEDOT:PSS / gold nanobipyramid film constitute a PEDOT:PSS / gold nanobipyramid substrate.

[0064] Specifically, the PEDOT:PSS / gold nanobipyramid solution is spin-coated on the ITO conductive film to a thickness of 40 nm, and annealed into a film on an annealing table at 120-140°C for 20-30 minutes.

[0065] Further, PEDOT:PSS is a high-molecular polymer and usually exists in the form of an aqueous solution, and has the characteristics of high conductivity and adjustable conductivity. The conductive polymer material is composed of PEDOT and PSS, wherein PEDOT is a polymer of PEDOT (3,4-ethylenedioxythiophene monomer), and PSS is polystyrene sulfonate. The water solubility of PEDOT can be greatly improved by the introduction of PSS.

[0066] Step S6: obtaining a PM6 / Y6 organic donor-acceptor blend solution according to the mass ratio of the organic donor PM6 and the organic acceptor Y6.

[0067] Specifically, the PM6 / Y6 organic donor-acceptor blend solution is configured in a mass ratio of (0.4-1):1.2. The mass ratio of PM6 is in a range of 0.4-1, and the mass ratio of Y6 is 1.2.

[0068] In addition, when the organic active layer blend solution is configured, the proportion of the donor-acceptor in the solution is adjusted, and the proportion of the donor material PM6 is reduced, so that the device has better light absorption in the near-infrared band and better transparency in the visible light band. The organic active layer uses the organic polymer PM6 as the donor and the non-fullerene small molecule Y6 as the acceptor.

[0069] Step S7: spin-coating the PM6 / Y6 organic donor-acceptor blend solution on the surface of the PEDOT:PSS / gold nanotube substrate to obtain a PM6:Y6 thin film; and the PM6:Y6 thin film and the PEDOT:PSS / gold nanotube substrate constitute a PM6:Y6 substrate.

[0070] Specifically, the PM6 / Y6 organic donor-acceptor blend solution is stirred for 24 hours to obtain a fully mixed PM6 / Y6 organic donor-acceptor blend solution. The fully mixed PM6 / Y6 organic donor-acceptor blend solution is spin-coated on the PEDOT:PSS / gold nanotube hole transport layer thin film in a glove box filled with N2, and the spin-coating speed is 2400 rpm-2600 rpm.

[0071] Step S8: annealing the PM6:Y6 substrate.

[0072] Specifically, the PM6:Y6 substrate is annealed to form an organic active layer PM6:Y6 thin film. The thickness of the organic active layer is in a range of 110-130 nm. After spin-coating, annealing is performed on an annealing table at 110°C for 10 minutes.

[0073] Step S9: evaporating and depositing BCP on the surface of the annealed PM6:Y6 substrate in a vacuum environment to obtain BCP; and the BCP and the PM6:Y6 substrate constitute a BCP substrate.

[0074] Specifically, the hole blocking material BCP with a thickness of 8 nm is evaporated and deposited on the surface of the organic active layer at a rate of 0.2 A / s in a vacuum environment, and the BCP is an electron transport layer and can block holes.

[0075] Step S10: evaporating and depositing Au / Ag on the surface of the BCP substrate in a vacuum environment to obtain an Au / Ag conductive thin film, and the Au / Ag conductive thin film and the BCP substrate constitute an Au / Ag substrate. ​

[0076] Specifically, in a vacuum environment, 1 nm Au / 10 nm Ag is deposited on the surface of the electron transport layer BCP to form a semi-transparent ultra-thin metal top electrode. Specifically, in a vacuum environment, 1 nm Au / 10 nm Ag is deposited on the surface of the electron transport layer BCP to form a semi-transparent ultra-thin metal top electrode.

[0077] Step S11: In a vacuum environment, LiF and MoO3 are deposited on the surface of the Au / Ag substrate to form a near-infrared reflective layer; the Au / Ag substrate and the near-infrared reflective layer form a semi-transparent organic solar cell.

[0078] Specifically, in a vacuum environment, 1 nm Au / 10 nm Ag is deposited on the surface of the electron transport layer BCP to form a semi-transparent ultra-thin metal top electrode. Specifically, in a vacuum environment, 1 nm Au / 10 nm Ag is deposited on the surface of the electron transport layer BCP to form a semi-transparent ultra-thin metal top electrode.

[0079] The PCE (power conversion efficiency, representing the ability of the solar cell to convert into electrical energy) of the near-infrared light absorption enhanced organic solar cell provided by the present application reaches 12.04%, the AVT (average visible light transmittance, representing the transparency of the semi-transparent solar cell) reaches 25.5%, and the LUE (light energy utilization rate, which is the product of AVT and PCE, and is a comprehensive evaluation index of the transparency and efficiency of the semi-transparent solar cell) reaches 3.07, which has strong competitiveness in the field of semi-transparent organic solar cells.

[0080] Table 1 is a performance table of different semi-transparent organic solar cell devices

[0081]

[0082]

[0083] As shown in Table 1, the LUE of the semi-transparent device doped with gold nanobipyramids with a ratio of 0.6:1.2 and deposited with a near-infrared reflective layer reaches the highest 3.07%. The organic active layer of the present application uses a non-fullerene acceptor Y6 which has good light absorption ability in the near-infrared band. At the same time, while keeping the total concentration of the organic active layer blending solution (16 mg / ml) unchanged, the ratio of the acceptor (Y6) is increased by reducing the ratio of the donor (PM6), so that the transmittance of the semi-transparent organic solar cell provided by the present application in the visible light band is increased, thereby improving the AVT.

[0084] As shown in Table 1, the LUE of the semi-transparent device doped with gold nanobipyramids with a ratio of 0.6:1.2 and deposited with a near-infrared reflective layer reaches the highest 3.07%. The organic active layer of the present application uses a non-fullerene acceptor Y6 which has good light absorption ability in the near-infrared band. At the same time, while keeping the total concentration of the organic active layer blending solution (16 mg / ml) unchanged, the ratio of the acceptor (Y6) is increased by reducing the ratio of the donor (PM6), so that the transmittance of the semi-transparent organic solar cell provided by the present application in the visible light band is increased, thereby improving the AVT. Figure 3 As shown in Table 1, the LUE of the semi-transparent device doped with gold nanobipyramids with a ratio of 0.6:1.2 and deposited with a near-infrared reflective layer reaches the highest 3.07%. The organic active layer of the present application uses a non-fullerene acceptor Y6 which has good light absorption ability in the near-infrared band. At the same time, while keeping the total concentration of the organic active layer blending solution (16 mg / ml) unchanged, the ratio of the acceptor (Y6) is increased by reducing the ratio of the donor (PM6), so that the transmittance of the semi-transparent organic solar cell provided by the present application in the visible light band is increased, thereby improving the AVT.

[0085] Figure 4 ​As shown, unlike PM6, the absorption peak of Y6 is in the near-infrared band around 820 nm. The use of non-fullerene small molecule material Y6 as an acceptor has little effect on the visible band transmittance of the device. At the same time, since 93% of the solar energy is concentrated in the visible and near-infrared bands, of which the near-infrared band accounts for >50%, the selection of non-fullerene material Y6 as the acceptor of the organic active layer helps to improve the light absorption and conversion efficiency.

[0086] As shown in Figure 5 The extinction spectrum of the gold nanobipyramid and the absorption peak of Y6 are highly matched. Doping gold nanobipyramids in the PEDOT: PSS hole transport layer can strengthen the light absorption of the solar cell in the near-infrared band through plasmonic effect. As can be seen from the table, under the same formulation, the efficiency of the semi-transparent solar cell doped with gold nanobipyramids is better than that of the undoped semi-transparent solar cell, thereby achieving higher light energy utilization of the device.

[0087] As shown in Figure 6 The semi-transparent organic solar cell with a near-infrared reflective layer has slightly improved transmittance in the visible band and higher AVT. In the near-infrared band of 780-1000 nm, the transmittance is obviously decreased. This part of sunlight is reflected back to the organic active layer by the near-infrared reflective layer and is finally absorbed by the organic active layer for the second time.

[0088] As shown in Figure 7 Due to the near-infrared light sensitivity of the aforementioned organic active layer, the near-infrared sunlight reflected back to the organic active layer by the near-infrared reflective layer and absorbed for the second time improves the short-circuit current density of the semi-transparent organic solar cell, thereby improving the PCE and LUE of the semi-transparent organic solar cell.

[0089] The method first uses non-fullerene material Y6 as an acceptor, so that the solar cell has good light absorption in the near-infrared band. By reducing the formulation of PM6 in the active layer, the average visible light transmittance of the solar cell is increased. On this basis, by introducing gold nanobipyramids into the hole transport layer, the light absorption in the near-infrared band of the solar cell is increased by means of plasmonic effect, without affecting the AVT, thereby achieving higher PCE. Finally, the combination of the near-infrared light reflective layer realizes the secondary absorption of the near-infrared light by the active layer and the improvement of the transmittance of the device in the visible band, thereby improving the LUE to 3.07%.

[0090] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be mutually referred to.

[0091] The principles and implementation manners of the present application are described by using specific examples in the present application, and the above examples are only used to help understand the method of the present application and its core idea; meanwhile, for the general technical personnel in the art, the specific implementation manners and application ranges will be changed according to the idea of the present application. In conclusion, the content of the present specification should not be understood as the limitation of the present application.

Claims

1. A semi-transparent organic solar cell with enhanced near-infrared light absorption, characterized in that, The battery comprises, from bottom to top, a substrate, an anode, a hole transport layer, an organic active layer, an electron transport layer, a metal top electrode and a near-infrared reflective layer; The hole transport layer is a PEDOT:PSS / gold nanobipyramid film; the plasmonic effect of the gold nanobipyramid enhances the light absorption of the device in the near-infrared waveband; The organic active layer is a PM6:Y6 film; the organic active layer is used to absorb near-infrared light in sunlight and generate dissociated excitons; the acceptor material of the organic active layer is a non-fullerene acceptor material Y6, the organic active layer uses an organic polymer PM6 as a donor, a non-fullerene small molecule Y6 as an acceptor, and the mass ratio is (0.4-1):1.2; The near-infrared reflective layer is a LiF / MoO3 film; the near-infrared reflective layer is used to reflect the incident near-infrared light to the organic active layer so that the organic active layer absorbs the near-infrared light again.

2. The near-infrared light absorption-enhanced translucent organic solar cell according to claim 1, wherein The thickness of the PEDOT:PSS / gold nanobipyramid film is 40 nm.

3. The near-infrared light absorption enhanced semi-transparent organic solar cell according to claim 1, wherein The thickness of the PM6:Y6 film is 110-130 nm.

4. The near-infrared light absorption enhanced semi-transparent organic solar cell according to claim 1, wherein The electron transport layer is BCP; the thickness of the BCP is 8 nm.

5. The near-infrared light absorption enhanced semi-transparent organic solar cell according to claim 1, wherein The substrate is a glass substrate.

6. The near-infrared light absorbing enhanced semi-transparent organic solar cell according to claim 1, wherein The anode is an ITO conductive film.

7. The near-infrared light absorbing enhanced semi-transparent organic solar cell according to claim 1, wherein The metal top electrode is an Au / Ag conductive film.

8. A method for the production of a semi-transparent organic solar cell with enhanced near-infrared light absorption, characterized in that The preparation method is applied to the near-infrared light absorption enhanced semi-transparent organic solar cell of any one of claims 1-7, and the preparation method comprises the following steps: ITO is deposited on the surface of a glass substrate by magnetron sputtering to obtain an ITO conductive film; the glass substrate and the ITO conductive film constitute an ITO substrate; The surface of the ITO substrate is cleaned with a cleaning agent, and the cleaned ITO substrate is placed in a high-temperature drying cabinet for drying; The dried ITO substrate is placed in an ultraviolet-ozone environment; Gold nanobipyramids are doped in an aqueous solution of a conductive polymer PEDOT:PSS to obtain a PEDOT:PSS / gold nanobipyramid solution; The PEDOT:PSS / gold nanobipyramid solution is spin-coated on the surface of the ITO substrate treated in the ultraviolet-ozone environment to obtain a PEDOT:PSS / gold nanobipyramid film; the ITO substrate and the PEDOT:PSS / gold nanobipyramid film constitute a PEDOT:PSS / gold nanobipyramid substrate; An organic donor PM6 and an organic acceptor Y6 are blended according to a mass ratio to obtain a PM6 / Y6 organic donor-acceptor blending solution; The PM6 / Y6 organic donor-acceptor blending solution is spin-coated on the surface of the PEDOT:PSS / gold nanobipyramid substrate to obtain a PM6:Y6 film; the PM6:Y6 film and the PEDOT:PSS / gold nanobipyramid substrate constitute a PM6:Y6 substrate; The PM6:Y6 substrate is annealed; BCP is deposited on the surface of the annealed PM6:Y6 substrate under vacuum to obtain BCP; the BCP and the PM6:Y6 substrate constitute a BCP substrate; In a vacuum environment, Au / Ag is deposited on the surface of the BCP substrate to obtain an Au / Ag conductive film; the Au / Ag conductive film and the BCP substrate form an Au / Ag substrate; In a vacuum environment, LiF and MoO3 are deposited on the surface of the Au / Ag substrate to obtain a near-infrared reflective layer; the Au / Ag substrate and the near-infrared reflective layer form a semi-transparent organic solar cell.

9. The method of producing a near-infrared light absorption enhanced semi- transparent organic solar cell according to claim 8, wherein The PEDOT:PSS aqueous solution comprises PEDOT and PSS; the PEDO is a polymer of 3,4-ethylenedioxythiophene monomer; and the PSS is polystyrene sulfonate.

10. The method of claim 8, wherein the near-infrared light absorption enhanced semi-transparent organic solar cell is prepared by the steps of: (a) preparing a semi-transparent organic solar cell; (b) coating the semi-transparent organic solar cell with a near-infrared light absorption layer; and (c) coating the semi-transparent organic solar cell with a semi-transparent metal layer. The cleaning agent comprises deionized water, acetone and isopropyl alcohol.

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