Additive-assisted perovskite solar cell and preparation method thereof

Abstract

The invention discloses an additive-assisted perovskite solar cell and a preparation method thereof, and the solar cell sequentially comprises a bottom layer substrate, a bottom electrode layer, a bottom charge collection layer, an active light absorption layer, a top layer charge collection layer and a top electrode layer from the bottom to the top; At least one of the bottom electrode layer and the top electrode layer is transparent. The active light absorption layer is an additive-assisted growth perovskite semiconductor material APbX3, wherein A is at least one of alkylamine, acid amidine and alkali family elements, and X is at least one of iodine, bromine and chlorine. According to the invention, the method adjusts the thin film shape and crystallinity of a perovskite active layer through adding a little additive to anhydrous lead acetate perovskite solution, and improves the transmission and collection of carriers. The method improves the positive and negative sweep difference of the perovskite solar cell, guarantees the steady-state output, and improves the efficiency and repeatability of the cell.

Description

technical field [0001] The invention belongs to the field of organic-inorganic hybrid perovskite batteries, and in particular relates to an additive-assisted high-efficiency perovskite solar battery and a preparation method thereof. Background technique [0002] In recent years, the efficiency of solar cells based on organic-inorganic perovskites has been developed rapidly, especially with CH 3 NH 3 PB 3 For representative solar cells, the efficiency has rapidly increased from the initially reported 3.8% to over 20%. Currently, PbI 2 as the preparation of CH 3 NH 3 PB 3 The most commonly used source of lead, widely used in many preparation methods. In order to achieve low-cost preparation of high-efficiency perovskite solar cells, various thin-film deposition techniques have been developed in the past few years, among which one-step or two-step solution methods have become the focus of attention. In comparison, the one-step process is simpler than the two-step proces...

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Problems solved by technology

[0004] (1) The photoelectric conversion efficiency of the device is relatively low, only about 14%;

[0005] (2) Under different forward and reverse scans, the device efficiency is quite different;

[0006] (3) The steady-state output characteristics of the device are not good

[0007] In addition, when using Pb(Ac) 2 .3H 2 In the process of O, triple crystallization water is introduced at the same time, and alkylamine ions are very sensitive to water, resulting in poor repeatability of the final device.

At the same time, the boiling point of water itself is higher than that of methylammonia acetate in the by-product, and the required heating temperature is relatively high and takes a long time, which does not match the requirements of low-temperature preparation of organic-inorganic perovskite solar cells.

[0008] Therefore, with Pb(Ac) 2 .3H 2 O is the raw material, and the disadvantages of using the existing one-step method to prepare organic-inorganic perovskite solar cells include: low device efficiency, poor steady-state output at the maximum power point, Pb(Ac) 2 .3H 2 OCrystal water affects device repeatability, etc.

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