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Small structures: effective strategies for realizing high open circuit voltage perovskite solar cells: crystal growth regulation, defect passivation, energy band regulation

this review first discusses how to control the crystal growth process of polycrystalline Perovskite Thin Films through the composition of precursor solution spin coating process to inhibit the formation of internal defects in perovskite grains so as to reduce the open circuit voltage loss of devices. As well as additives with small molecular defects such as perovskite halogenate can effectively enhance the open circuit voltage of devices. Secondly the post-treatment of perovskite films especially the organic amine halides can greatly inhibit the non radiative recombination of carriers at the interface of the transport layer so as to achieve higher open circuit voltage. At the same time the use of electron hole transport layer matching with the energy b of the perovskite layer is also the necessary guarantee to achieve high open circuit voltage. In addition to the reported effective strategies this review also looks forward to further reducing the voltage loss in Perovskite Thin film crystal at grain boundary surface at the interface of functional layer puts forward some feasible schemes such as rapid screening of efficient passivators by machine learning control of crystallization rate by mesophase Engineering accurate anchoring of energy b position by new testing methods etc One step to improve the energy conversion efficiency of perovskite solar cells.
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