CZTSSe flexible double-sided solar cell and preparation method thereof
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A double-sided solar cell and solar cell technology, applied in the field of solar cells, can solve the problems of lack of process technology, large occupied area, and inability to fully utilize sunlight, etc., to achieve cost savings, reduced occupied area, and improved utilization efficiency.
Inactive Publication Date: 2020-12-04
FUZHOU UNIV
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[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a CZTSSe flexible double-sided solar cell and its preparation method, thus solving the existing problems in the prior art such as inability to fully utilize sunlight, large occupied area, and lack of process technology.
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Embodiment 1
[0030] Preparation process of double-sided CZTSSe thin film:
[0031] (1) Add elemental copper, zinc, tin, sulfur, and selenium into the mixture of ethylenediamine and ethylenedithiol in a certain proportion, heat and stir to obtain a uniform and clear CZTSSe precursor solution.
[0032] (2) Transfer the CZTSSe precursor solution to the glove box, drop it onto one side (front) of the flexible molybdenum foil for spin coating, turn it at 3000 rpm for 30s, and then sinter it on a hot stage at 300 degrees to obtain a Thin CZTSSe films.
[0033] (3) Spin-coat the reverse side of the molybdenum foil onto which the CZTSSe precursor solution was dropped, spin at 3000 rpm for 30s, then place the sample in the air, place it on the hot stage for sintering at 300 degrees, and obtain a thin layer of CZTSSe film on the reverse side of the molybdenum foil .
[0034] (4) Repeat the process of spin coating and sintering, alternately deposit CZTSSe film on the front and back of the above fil...
Embodiment 2
[0036] The specific preparation process of CZTSSe flexible double-sided solar cells:
[0037] (1) Under constant pressure conditions, the molybdenum foil was placed in a mixed solution of methanol (85mL) and concentrated sulfuric acid (15mL) through electrochemical cleaning to remove surface impurities and molybdenum oxide. Then ultrasonically clean with deionized water, isopropanol, and absolute ethanol in sequence, each for 5 minutes, and then blow dry with nitrogen.
[0038] (2) Using precursor solution spin-coating technology, spin-coat CZTSSe precursor solution on both sides of the molybdenum foil substrate, and then obtain a CZTSSe thin film by overhead annealing. Repeat spin-coating and annealing many times to obtain a thickness of 1 μm ~ 4 μm;
[0039] (3) Put the Mo sheet sample with CZTSSe layer and selenium powder into a closed graphite box, place it in a rapid thermal annealing furnace protected by nitrogen, and selenize it at a temperature of 550 °C for 15 min to...
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Abstract
The invention discloses a CZTSSe flexible double-sided solar cell. The CZTSSe flexible double-sided solar cell comprises a CZTSSe solar cell body on the front side, a CZTSSe solar cell body on the back side and the same flexible substrate connected in the middle. The front side and the back side of the double-sided solar cell structurally comprise a flexible molybdenum foil substrate, a molybdenumselenide layer, a CZTSSe absorption layer, a CdS buffer layer, a ZnO / ITO window layer and a metal electrode from inside to outside. The preparation method comprises the following steps of: (1) double-sided cleaning of molybdenum foil, namely, simultaneously cleaning two sides by using an electrochemical method; (2) preparing a double-sided CZTSSe thin film by using a solution method and carryingout common selenization treatment on the double-sided CZTSSe thin film; (3) simultaneously carrying out chemical water bath deposition on a double-sided buffer layer; (4) depositing a double-sided window layer by adopting an alternate sputtering method; and (5) preparing a double-sided metal electrode by adopting an evaporation method. According to the CZTSSe flexible double-sided solar cell and the preparation method thereof, sunlight can be utilized in an omnibearing and multi-angle mode, the utilization rate and the conversion efficiency of the sunlight are improved, flexible portable products, suspension type photovoltaic decoration products and the like can be manufactured, and photovoltaic building decoration integration is achieved.
Description
technical field [0001] The invention belongs to the field of solar cells, and more specifically relates to a CZTSSe flexible double-sided solar cell and a preparation method thereof. Background technique [0002] Cu with kesterite structure 2 ZnSn(S, Se) 4 (abbreviated as CZTSSe) has a suitable energy band gap (1.02-1.5eV) and absorption coefficient (10 4 cm -1 ), and its constituent elements are more abundant, cheap and environmentally friendly, and it is considered to be one of the more promising absorbing layer materials for thin-film batteries in the future. Due to the advantages of light weight, low cost, and bendability, CZTSSe flexible thin-film solar cells have shown great application value in portable devices, mobile power and other applications. Commonly used flexible substrates include polyimide, aluminum foil, molybdenum foil, flexible glass and stainless steel, etc., and the obtained flexible CZTSSe cell efficiency exceeds 10%. Because the molybdenum subst...
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