Abstract
In recent years, flexible perovskite solar cells have drawn tremendous attention in the field of wearable devices, and optimization of perovskite composition plays an important role in improving film quality and photophysical properties. At present, some researchers have only studied A-site organic cations mixing or X-site halide anions mixing in the ABX3 structure of perovskite, but there are few reports on co-mixing of A-site and X-site ions in flexible perovskite solar cells. In this paper, we mainly try to study the effects of different concentrations of mixed formamidine methylamine halide (FAxMA1-xBrxClyI1-x-y) precursor solutions on the quality and photophysical properties of perovskite films under low temperature process. We conclude that the film quality and photophysical properties reached the best results when the optimized precursor solution concentration was 60:6:6. The investigation on composition optimization in this experiment laid the foundation for the improvement of the performance of flexible perovskite solar cells. We also use the results of this experiment to prepare flexible perovskite solar cells based on carbon electrodes, which are expected to be applied in other flexible optoelectronic or electro-optical devices.
Highlights
Flexible perovskite solar cells are expected to be integrated into wearable mobile devices to form self-powered devices due to their light weight, flexibility, and low cost, which has aroused increasing interest in the field of organic–inorganic hybrid perovskite solar cells [1,2,3,4,5]
We mainly investigated the effects of different concentrations of mixed formamidine methylamine halide (FAx MA1-x Brx Cly I1-x-y ) precursor solution on perovskite film quality and photophysical properties under a low temperature process
Our work shows that the optimization of the perovskite composition can improve the film quality and photophysical properties
Summary
Flexible perovskite solar cells are expected to be integrated into wearable mobile devices to form self-powered devices due to their light weight, flexibility, and low cost, which has aroused increasing interest in the field of organic–inorganic hybrid perovskite solar cells [1,2,3,4,5]. By changing the concentration of the mixed formamidine methylamine halide (FAx MA1-x Brx Cly I1-x-y ) precursor solution, we prepared perovskite solar cells under low temperature process and characterized the perovskite film and device performance. We have obtained an optimal ratio of precursor solution, which has laid the foundation for the flexible perovskite solar cell preparation and optimization process; we used the results of this experimental study to prepare flexible perovskite solar cells based on carbon film counter electrodes In this experiment, we prepared perovskite layers by adjusting the concentrations of mixed formamidine methylamine halide (FAx MA1-x Brx Cly I1-x-y ) precursor solution, and prepared the perovskite solar cell. Through the characterization of the perovskite film and device performance, we found that when the concentration was 60:6:6, the film quality, photophysical properties, and device performance reached the best result
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