Two-dimensional perovskite material, preparation method thereof and solar cell
A technology of perovskite materials and perovskite precursors, applied in the field of solar cells, can solve problems such as the difficulty in the industrial preparation of two-dimensional perovskite thin films, and achieve simple and controllable preparation method conditions, stable photoelectric conversion efficiency, and cost-effectiveness. good film effect
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[0039] The present invention also provides a method for preparing the above-mentioned two-dimensional perovskite material, including:
[0040]S1, the first precursor, the second precursor and the third precursor are dissolved in a solvent, and mixed to obtain a perovskite precursor solution, wherein the first precursor is a metal halide, and the second precursor is a metal halide. is an organic ammonium salt, and the structural formula of the third precursor is shown in the following formula (2),
[0041]
[0042] where R 1 is a straight-chain or branched alkyl group with 2-20 carbon atoms;
[0043] S2, providing a substrate, coating the perovskite precursor solution on the substrate and annealing to obtain a two-dimensional perovskite material.
[0044] In step S1, the metal halide includes PbCl 2 , PbBr 2 , PbI 2 , SnCl 2 , SnBr 2 , SnI 2 , GeCl 2 , GeBr 2 , GeI 2 At least one of, preferably PbI 2 ; the organic ammonium salt includes CH 3 NH 3 I(MAI), NH 2 ...
Embodiment 1
[0073] The etched ITO conductive glass substrate was ultrasonically cleaned with a cleaning agent, deionized water, acetone and isopropanol for 20 min respectively, and then placed in an oven to dry to obtain a transparent conductive layer.
[0074] The dried transparent conductive layer was subjected to ultraviolet ozone treatment for 30 min, and the PEDOT:PSS solution was spin-coated at 3000 rpm for 30 s, and then annealed at 150° C. for 10 min to form a hole transport layer.
[0075] the PbI 2 , CH 3 NH 3 I. DPP-2T was dissolved in DMF:DMSO (v / v 4:1) solvent according to the molar ratio (n:n-1:1, n=4), stirred at 60°C for 4 hours, and mixed to obtain perovskite Precursor solution, the concentration of the precursor solution is 0.8mol / L. in N 2 In an atmospheric glove box, 100 μL of the perovskite precursor solution was dropped on the hole transport layer and quickly spin-coated at 6000 rpm for 30 s to form a thin film, which was then annealed on a heating table at 100 °...
Embodiment 2
[0079]The etched ITO conductive glass substrate was ultrasonically cleaned with a cleaning agent, deionized water, acetone and isopropanol for 20 min respectively, and then placed in an oven to dry to obtain a transparent conductive layer.
[0080] The dried transparent conductive layer was subjected to ultraviolet ozone treatment for 30 min, and the PEDOT:PSS solution was spin-coated at 3000 rpm for 30 s, and then annealed at 150° C. for 10 min to form a hole transport layer.
[0081] the PbI 2 , CH 3 NH 3 I. DPP-2T was dissolved in DMF:DMSO (v / v 4:1) solvent according to the molar ratio (n:n-1:1, n=4), stirred at 60°C for 4 hours, and mixed to obtain perovskite Precursor solution, the concentration of the precursor solution is 0.4mol / L. in N 2 In an atmospheric glove box, 100 μL of the perovskite precursor solution was dropped on the hole transport layer and quickly spin-coated at 6000 rpm for 30 s to form a thin film, which was then annealed on a heating table at 80 °C ...
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