Accelerated Crystal Growth in >16% Printed MAxFAyCszPbI3 Perovskite Solar Cells from Aqueous Inks

摘要

A key to commercializing perovskite solar cells(PSCs) is to use less toxic solvents such as water, alcohol, andother nontoxic compounds when printing them. Improving theperovskite crystal growth rate to reduce defects produced by theOstwald ripening effect is a critical challenge in fabricating high-quality perovskitefilms from aqueous inks. In this study, wereported an accelerated crystal growth strategy for printingMAxFAyCszPbI3perovskitefilms with aqueous inks. The use oftrace amounts of MAI in aqueous inks to generate nanosized PbI2seeds increased the perovskite formation speed by about 30% andreduced the apparent activation energy of the perovskite formingreaction by about 700 Jmiddotmol-1. Consequently, printed PSCsachieved a power conversion efficiency (PCE) of 16.53% andshowed an ameliorative stability of 400 h in a dry environment. We proved that high-performance PSCs can be fabricated usingaqueous inks, which demonstrated that toxic solvents are not inevitable of fabricating high-performance PSCs

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