Preparation method and application of tin-lead binary perovskite thin film growing in preferred orientation mode

Abstract

The invention relates to a preparation method for a tin-lead binary perovskite thin film growing in a preferred orientation mode, which combines additive engineering with ultrasonic external force inthe process of preparing the tin-lead binary perovskite thin film by using a one-step spin-coating method, and treats a precursor solution. By adding the solid additive tartaric acid into the precursor solution, the crystallization speed can be delayed while the perovskite crystal structure is stabilized, and further ultrasonic treatment is adopted, so that controllable preferred growth of different crystal faces can be realized in the growth process of the thin film crystal, and the crystallization quality of the tin-lead binary perovskite polycrystalline thin film is improved. The prepared tin-lead binary perovskite thin film with the (224) preferred orientation is used for manufacturing the perovskite solar cell of an inverted structure, and the cell structure is ITO / PEDOT:PSS / MA0.9Cs0.1Pb0.75Sn0.25I3 / PCBM / Ag. And the photoelectric conversion efficiency of the perovskite solar cell is obviously improved. The preparation process for realizing the kinetic regulation and control on thegrowth of the tin-lead binary absorption layer thin film crystal has the characteristics of simplicity in operation, safety, environmental protection and high repeatability.

Description

Technical field [0001] The invention belongs to the technical field of nano-functional materials, and specifically is a method for preparing a tin-lead binary perovskite film grown in a preferential orientation. The method is manifested in regulating the growth process of a low-toxic tin-lead binary perovskite absorption layer , Realize the controllable preferred orientation growth from (110) crystal plane to (224) crystal plane and the construction of corresponding perovskite solar cells. Background technique [0002] Polycrystalline perovskite materials can be widely used in emerging fields such as solar cells, light-emitting diodes, and quantum dots due to their excellent photoelectric properties, such as high volume mobility, micron diffusion length, and large absorption coefficient. in. Up to now, perovskite solar cells have attracted the attention of many researchers with their cheap production costs and continuous breakthroughs in photovoltaic characteristics. Among them...

AI Technical Summary

Problems solved by technology

[0004] In view of the poor photoelectric characteristics of the film caused by the excessive crystallization speed of the current tin-lead low-toxicity binary perovskite polycrystalline material system and the large amount of Sn 2+ is oxidized to Sn 4+ Problems such as the ability to severely damage the three-dimensional perovskite structure at the time greatly limit the improvement of the performance of this type of perovskite photovoltaic device.

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