钝化
钙钛矿(结构)
结晶
甲脒
材料科学
化学工程
能量转换效率
螯合作用
同音
开路电压
齿合度
化学
图层(电子)
纳米技术
光电子学
金属
电压
冶金
物理
量子力学
工程类
作者
Haichao Yang,Ru Li,Shaokuan Gong,Huaxin Wang,Saif M. H. Qaid,Qian Zhou,Wensi Cai,Xihan Chen,Jiangzhao Chen,Zhigang Zang
出处
期刊:Nano Letters
[American Chemical Society]
日期:2023-09-06
卷期号:23 (18): 8610-8619
被引量:5
标识
DOI:10.1021/acs.nanolett.3c02444
摘要
Defects in the electron transport layer (ETL), perovskite, and buried interface will result in considerable nonradiative recombination. Here, a bottom-up bilateral modification strategy is proposed by incorporating arsenazo III (AA), a chromogenic agent for metal ions, to regulate SnO2 nanoparticles. AA can complex with uncoordinated Sn4+/Pb2+ in the form of multidentate chelation. Furthermore, by forming a hydrogen bond with formamidinium (FA), AA can suppress FA+ defects and regulate crystallization. Multiple chemical bonds between AA and functional layers are established, synergistically preventing the agglomeration of SnO2 nanoparticles, enhancing carrier transport dynamics, passivating bilateral defects, releasing tensile stress, and promoting the crystallization of perovskite. Ultimately, the AA-optimized power conversion efficiency (PCE) of the methylammonium-free (MA-free) devices (Rb0.02(FA0.95Cs0.05)0.98PbI2.91Br0.03Cl0.06) is boosted from 20.88% to 23.17% with a high open-circuit voltage (VOC) exceeding 1.18 V and ultralow energy losses down to 0.37 eV. In addition, the optimized devices also exhibit superior stability.
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