Perovskite solar cell and preparation method thereof

Abstract

The invention provides a perovskite solar cell and a preparation method thereof and relates to a solar cell. The perovskite solar cell is of a laminated structure and is sequentially provided with a substrate, a transparent electrode, a compact electron transfer layer, a mesopore layer, a perovskite light absorption layer, a hole transporting layer and a counter electrode from bottom to top. The preparation method comprises the steps of performing evaporation or sputtering of the transparent electrode on the substrate; coating the transparent electrode with dispersion liquid, and after sintering, preparing the electron transfer layer; coating the electron transfer layer with dispersion liquid, and after sintering, preparing the mesopore layer; coating the mesopore layer with a one-step method perovskite alkaline solution, and after annealing, preparing a perovskite crystal film; preparing the counter electrode on the perovskite crystal film, and obtaining the perovskite solar cell. Prepared perovskite film crystal is high in thickness and compact, holes and needle holes and the like are eliminated completely, the high quality film-forming reproducibility of perovskite is very good, and the stability and photoelectric conversion efficiency of the perovskite solar cell are greatly improved.

Description

technical field [0001] The invention relates to a solar cell, in particular to a perovskite solar cell and a preparation method thereof. Background technique [0002] Solar energy is the energy produced by the continuous nuclear fusion reaction process inside the sun. Although the energy radiated by the sun into the earth's atmosphere is only 1 / 2.2 billion of its total radiated energy, the average solar radiation intensity in the earth's orbit is 1,369w / m 2 , The energy obtained by the earth can reach 173,000TW, which means that the energy that the sun irradiates on the earth every second is equivalent to burning 5 million tons of coal. According to the survey of the 64th edition of "BP Energy Statistical Yearbook" in 2015, the total primary energy consumption of countries in the world reached 12,928.4 million tons of oil equivalent in 2014, which is equivalent to consuming 586 tons of coal per second, which is close to the sun shining on the earth every second One ten-tho...

AI Technical Summary

Problems solved by technology

[0006] subject to PbI 2 The solubility is small and PbI 2 and CH 3 NH 3 Factors such as uneven proportioning ratio, whether it is a one-step method or a two-step method, the concentration of the solution is low, resulting in a thin perovskite film, which is easy to cause the perovskite film to be not compact enough, and there are phenomena such as holes and pinholes, which lead to calcium The high-quality film-forming reproducibility of titanium ore is extremely poor, resulting in the low voltage, current and fill factor of the key parameters of perovskite solar cells, which ultimately affects the photoelectric conversion efficiency of solar cells and seriously restricts the improvement of the efficiency of perovskite solar cells and the commercialization of solar cells. process

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