异质结
材料科学
钙钛矿(结构)
结晶度
光电子学
能量转换效率
纳米颗粒
纳米技术
化学工程
化学
复合材料
结晶学
工程类
作者
Minchao Liu,Yiyang Wang,Chenxing Lu,Chen Zhu,Zhe Li,Jinyuan Zhang,Meng Ye,Yuyao Feng,Xin Jiang,Siguang Li,Meng Li,Yongfang Li
标识
DOI:10.1002/anie.202318621
摘要
Perovskite solar cell (pero-SC) has attracted extensive studies as a promising photovoltaic technology, wherein the electron extraction and transfer exhibit pivotal effect to the device performance. The planar SnO2 electron transport layer (ETL) has contributed the recent record power conversion efficiency (PCE) of the pero-SCs, yet still suffers from surface defects of SnO2 nanoparticles which brings energy loss and phase instability. Herein, we report a localized oxidation embellishing (LOE) strategy by applying (NH4 )2 CrO4 on the SnO2 ETL. The LOE strategy builds up plentiful nano-heterojunctions of p-Cr2 O3 /n-SnO2 and the nano-heterojunctions compensate the surface defects and realize benign energy alignment, which reduces surface non-radiative recombination and voltage loss of the pero-SCs. Meanwhile, the decrease of lattice mismatch released the lattice distortion and eliminated tensile stress, contributing to better stability of the devices. The pero-SCs based on α-FAPbI3 with the SnO2 ETL treated by the LOE strategy realized a PCE of 25.72 % (certified as 25.41 %), along with eminent stability performance of T90 >700 h. This work provides a brand-new view for defect modification of SnO2 electron transport layer.
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