Abstract
Simultaneously passivating the perovskite surface defects (VI, Pbi) and suppressing Li+ ions diffusion of hole transport layer (HTL) are still challenging issues. Herein, we report an effective " three birds with one stone " strategy by utilizing sodium 4,4'-(1,4-phenylenebis(oxy))bis(butane-1-sulfonate) (ZR3) containing sulfonic acid groups (SO3-) and Na+ ions as a multifunctional surface treatment modulator to simultaneously address the above issues. It is found that ZR3 is not only capable of passivating the Pb-related defects at the surface of perovskite by the SO3- group, but also possesses the remarkable ability to passivate the halide defects with Na+ ions. Meanwhile, ZR3 treatment enables the enhanced exciton dissociation of perovskite, better energy level alignment with hole transport layer (HTL), improved hole extraction/transfer from perovskite layer into HTL, and reduced charge carrier recombination in device. Therefore, it results in the enhanced power conversion efficiency (PCE) of 25.34% in ZR3-based n-i-p device from 22.97% for the control device. Specifically, p-i-n PSCs with ZR3 also achieves an improved PCE of 25.96% with respect to the pristine one (23.99%), proving the universality of ZR3 for PSCs. Moreover, the stabilities of ZR3-treated devices are significantly enhanced owing to Li+ ions migration suppressing and perovskite defects reduction.
Published Version
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