Efficient inverted planar formamidinium lead iodide perovskite solar cells via a post improved perovskite layer
Abstract
Formamidinium lead iodide (FAPbI3) is a more promising broader absorption material than methylammonium lead iodide (MAPbI3) for perovskite solar cells (PSCs). However, in most cases the power conversion efficiencies (PCE) of FAPbI3 based inverted planar PSCs are still lower than those of MAPbI3 ones due to the inferior morphology of FAPbI3 film. In this paper, we demonstrate an optimised formamidinium iodide/isopropyl alcohol (FAI/IPA) modification procedure to improve the photoactive layer for efficient inverted planar FAPbI3 PSCs. The results show that there is an obvious improvement in open circuit voltage, short current density (JSC), and fill factor (FF). Finally, the best PCE of 14.00% with a JSC of 21.75 mA cm−2 and a FF of 0.78 was achieved in low-temperature solution-processed PSCs, which represents a more than 40% enhancement in PCE over that of the PSCs without surface modification. Moreover, the devices exhibit good reproducibility and excellent stability. The simple FAI/IPA modification on the photoactive layer can greatly improve planar FAPbI3 based device performance, which can be a good choice for practical applications.
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