Efficient and Stable Perovskite Solar Cells were Obtained by Salicylic Acid Interface Passivation
By using salicylic acid as an interface passivator between the perovskite active layer and the hole transport layer,C=O in SA can interact with uncoordinated Pb2+,effectively passivating defects at the interface and grain boundaries of perovskite films,and improving the transport and extraction capabilities of charge carriers.In addition,SA,as a conjugated molecule,has different insulation properties from commonly used alkyl additives.Its excellent conductivity significantly improves the photoelectric performance of PSCs,and the coplanar properties of conjugated molecules make it well covered on the surface of perovskite films,providing a certain insulation effect on oxygen and water in the external environment.Therefore,under the optimal concentration of SA modification,the PCE of PSCs increased from 20.10% to 22.35%,and their stability was significantly improved.
perovskite solar cellsinterfaceconjugated moleculespassivationdefects
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