CN-121984432-A - System and method for improving conversion efficiency of solar cell by using circularly polarized light

Abstract

The invention relates to a system and a method for improving the conversion efficiency of a solar cell by using circularly polarized light, and belongs to the technical field of solar cell light energy conversion. The conventional unpolarized light is converted into circularly polarized light, so that the spin direction of an excited carrier in the solar cell is regulated and controlled to be matched with the spin selectivity of the cell, and the transport efficiency and the light energy conversion efficiency of the carrier are improved. Experiments show that in chiral dye sensitized solar cells, organic photovoltaics and perovskite solar cells, the photoelectric conversion efficiency can be remarkably improved by adopting circularly polarized light irradiation. The invention provides a novel optical regulation strategy for the high-efficiency light energy utilization of the solar cell.

Inventors

• WANG YIOU
• ZHANG YANG

Assignees

• 北京理工大学

Dates

Publication Date

20260505

Application Date

20260127

Claims (9)

1. 1. A system for improving solar cell conversion efficiency by using circularly polarized light, which is characterized in that: the system comprises a sunlight simulator, a polarization optical system, a solar cell and an efficiency evaluation system; the polarization optical system consists of a linear polaroid and a quarter wave plate and can convert unpolarized light into left-handed or right-handed circularly polarized light; The solar simulator is used for simulating solar light and outputting the simulated solar light to the linear polaroid, the linear polaroid outputs linear polarized light to the quarter wave plate after polarizing the received simulated solar light, and the quarter wave plate converts the received linear polarized light into circularly polarized light to the solar cell; the solar battery converts the received circularly polarized light into electric energy and outputs the electric energy to the efficiency evaluation system; The efficiency evaluation system evaluates the performance of the solar cell according to the received electric energy.
2. 2. A system for improving solar cell conversion efficiency using circularly polarized light as claimed in claim 1, wherein: The quarter wave plate is an achromatic wave plate; the solar cell is at least one of a dye sensitized solar cell, an organic photovoltaic cell and a perovskite solar cell; the dye-sensitized solar cell is a chiral dye-modified dye-sensitized solar cell; the organic photovoltaic cell is a chiral organic photovoltaic cell; the perovskite solar cell is a perovskite solar cell with chiral ligand modification or chiral A position.
3. 3. A method for improving the conversion efficiency of a solar cell by using circularly polarized light, characterized in that the method comprises the following steps: the method comprises the steps that firstly, simulated sunlight is output to a linear polarizer through a sunlight simulator, the linear polarizer is used for outputting linear polarized light to a quarter wave plate after polarized to the received simulated sunlight, and the quarter wave plate is used for converting the received linear polarized light into circularly polarized light to a solar cell; the second step, the solar battery converts the received circularly polarized light into electric energy and outputs the electric energy to the efficiency evaluation system; and thirdly, performing performance evaluation of the solar battery by the efficiency evaluation system according to the received electric energy.
4. 4. A method for improving conversion efficiency of a solar cell by using circularly polarized light according to claim 3, wherein: the polarization direction of the circularly polarized light is matched with the spin selectivity direction of the solar cell.
5. 5. A method for improving conversion efficiency of a solar cell by using circularly polarized light according to claim 3, wherein: In the first step, the calibration method of the light intensity of the simulated sunlight output by the sunlight simulator comprises the following steps: the intensity of light was calibrated to 100 mW cm - 2 using a standard silicon cell; The intensity of the circularly polarized light was calibrated to 100 mW cm - using a standard silicon cell.
6. 6. A method for improving conversion efficiency of a solar cell by using circularly polarized light according to claim 3, wherein: The preparation method of the dye sensitized solar cell comprises the steps of sequentially carrying out ultrasonic cleaning on FTO glass in water, ethanol and acetone, then spin-coating a TiO 2 porous film on the surface of the FTO glass, placing the porous film in a muffle furnace for sintering at 500 ℃ for 4 h, naturally cooling, soaking the porous film in a chiral dye solution for 24 h to obtain a photo-anode, finally combining a platinum counter electrode with an iodine electrolyte for assembly, and carrying out packaging treatment to ensure stability.
7. 7. A method for improving conversion efficiency of a solar cell by using circularly polarized light according to claim 3, wherein: The preparation method of the organic photovoltaic cell comprises the steps of based on an ITO/ZnO/PTB7-Th (S, S) -IE 4F/MoO 3 /Ag structure, spin-coating a ZnO precursor solution on the surface of ITO glass, annealing at 200 ℃ to form a ZnO electron transport layer, spin-coating active layer materials PTB7-Th and (S, S) -IE4F in an inert atmosphere, annealing at 100 ℃, finally vacuum evaporating MoO 3 and Ag, and packaging to ensure stability.
8. 8. A method for improving conversion efficiency of a solar cell by using circularly polarized light according to claim 3, wherein: The perovskite solar cell adopts an n-i-p type planar structure, is formed by sequentially spin-coating precursor solution of compact TiO 2 /SnO 2 on an ITO/FTO electron transport layer material, wherein TiO 2 is annealed at 450 ℃ and SnO 2 is annealed at 150 ℃, MAPbI 3 precursor solution is annealed at 100 ℃, a hole transport layer material Spiro-OMeTAD is dried and formed at room temperature, and finally a vacuum evaporation gold electrode is used for completing device construction, and packaging treatment is carried out in the assembly process to ensure stability.
9. 9. A method for improving conversion efficiency of a solar cell by using circularly polarized light according to claim 3, wherein: in the third step, the method for evaluating the performance of the solar cell comprises the following steps: firstly, measuring a J-V standard curve of a solar cell under unpolarized light; then, by adjusting the angle of the quarter wave plate to generate circularly polarized light with set rotation direction, measuring the J-V test curve of the solar cell again; And calculating the J-V standard curve and the J-V test curve to obtain the conversion efficiency of the solar cell under the unpolarized light condition and the polarized light condition, and evaluating the improvement effect of the circularly polarized light on the performance of the solar cell.

Description

System and method for improving conversion efficiency of solar cell by using circularly polarized light Technical Field The invention relates to a system and a method for improving the efficiency of a solar cell by using circularly polarized light, belongs to the technical field of solar cells, and particularly relates to a system and a method for improving the photoelectric conversion efficiency of the solar cell by regulating and controlling the spin state of a carrier through optical polarization. Background The solar cell is a key device for directly converting light energy into electric energy, and the efficiency of the solar cell is influenced by various factors such as light absorption of materials, carrier separation and transportation. Under the irradiation of unpolarized light, the conventional solar cell has random spin directions of excited carriers, so that partial carriers are scattered or compounded due to mismatching of spins in the transportation process, and the energy conversion efficiency is reduced. Disclosure of Invention The invention solves the technical problem of overcoming the defects of the prior art and provides a system and a method for improving the conversion efficiency of a solar cell by utilizing circularly polarized light. The technical scheme of the invention comprises the following steps: A system for improving the conversion efficiency of a solar cell by using circularly polarized light comprises a sunlight simulator, a polarization optical system, a solar cell and an efficiency evaluation system; the polarization optical system consists of a linear polaroid and a quarter wave plate, and can convert unpolarized light into left-handed or right-handed circularly polarized light; The solar simulator is used for simulating solar light and outputting the simulated solar light to the linear polaroid, the linear polaroid outputs linear polarized light to the quarter wave plate after polarizing the received simulated solar light, and the quarter wave plate converts the received linear polarized light into circularly polarized light to the solar cell; the solar battery converts the received circularly polarized light into electric energy and outputs the electric energy to the efficiency evaluation system; the efficiency evaluation system evaluates the performance of the solar cell according to the received electric energy. The quarter wave plate is an achromatic wave plate to reduce wavelength dependent loss; the solar cell is at least one of a dye sensitized solar cell, an organic photovoltaic cell and a perovskite solar cell; the solar cell is provided with a spin-selective interface or a chiral structure, and can selectively transmit carriers in a set spin direction; the dye-sensitized solar cell is a chiral dye-modified dye-sensitized solar cell; the organic photovoltaic cell is a chiral organic photovoltaic cell; The perovskite solar cell is a perovskite solar cell modified by chiral ligand or chiral A-site; a method for improving conversion efficiency of a solar cell using circularly polarized light, the method comprising the steps of: the method comprises the steps that firstly, simulated sunlight is output to a linear polarizer through a sunlight simulator, the linear polarizer is used for outputting linear polarized light to a quarter wave plate after polarized to the received simulated sunlight, and the quarter wave plate is used for converting the received linear polarized light into circularly polarized light to a solar cell; the second step, the solar battery converts the received circularly polarized light into electric energy and outputs the electric energy to the efficiency evaluation system; and thirdly, performing performance evaluation of the solar battery by the efficiency evaluation system according to the received electric energy. The polarization direction of the circularly polarized light is matched with the spin selectivity direction of the solar cell; In the first step, the calibration method of the light intensity of the simulated sunlight output by the sunlight simulator comprises the following steps: the intensity of light was calibrated to 100 mW cm - 2 using a standard silicon cell; The calibration of the light intensity of the circularly polarized light is to use a standard silicon cell to calibrate the light intensity to 100 mW cm -; The preparation method of the dye sensitized solar cell comprises the steps of sequentially carrying out ultrasonic cleaning on FTO glass in water, ethanol and acetone, then spin-coating a TiO 2 porous membrane on the surface of the FTO glass, placing the porous membrane in a muffle furnace for sintering at 500 ℃ for 4h, naturally cooling, soaking the porous membrane in a chiral dye solution (such as chlorophyll) for 24h to obtain a photo-anode, finally combining a platinum counter electrode with an iodine electrolyte for assembly, and carrying out packaging treatment to ensure stability; The preparation method of th