Study on Effect of Multifunctional Additives on Performance of All-inorganic Perovskite Photovoltaic Devices
Ion migration in the light-absorbing layer of CsPbI3-xBrx,more surface defects and poor film quality limit the improvement of power conversion efficiency(PCE)of perovskite optoelectronic devices.Therefore,the multifunctional additive guanidinium thiocyanate(GuSCN)was added into the solution of the perovskite precursor to inhibit ion migration by utilizing the strong hydrogen bond between Gu+and[PbI6]4-.Meanwhile,SCN-in GuSCN not only acted as a pseudohalide to reduce the number of halide defects in the perovskite,but also induced Oswald ripening to increase the grain size to obtain high-quality films.Finally,high-quality light-absorbing layer films with excellent stability and good crystallinity was obtained.The treated films were used into all-inorganic perovskite optoelectronic devices,it was found that the PCE increased from the original 9.01%to 11.73%,further demonstrating that the multifunctional additives could effectively improve the performance of optoelectronic devices.
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