Mediating the Local Oxygen-Bridge Interactions of Oxysalt/Perovskite Interface for Defect Passivation of Perovskite Photovoltaics
Mediating the Local Oxygen?Bridge Interactions of Oxysalt/Perovskite Interface for Defect Passivation of Perovskite Photovoltaics
摘要
Abstract
Passivation, as a classical surface treatment technique, has been widely accepted in start-of-the-art perovskite solar cells (PSCs) that can effectively modulate the electronic and chemical property of defective perovskite surface. The discovery of inorganic passivation compounds, such as oxysalts, has largely advanced the efficiency and lifetime of PSCs on account of its favorable electrical property and remarkable inherent stability, but a lack of deep understanding of how its local configuration affects the passivation effectiveness is a huge impediment for future interfacial molecular engineering. Here, we demonstrate the central-atom-dependent-passivation of oxysalt on perovskite surface, in which the central atoms of oxyacid anions dominate the interfacial oxygen-bridge strength. We revealed that the balance of local interactions between the central atoms of oxyacidanions (e.g., N, C, S, P, Si) and the metal cations on perovskite surface (e.g., Pb) generally determines the bond formation at oxysalt/perovskite interface, which can be understood by the bond order conservation principle. Silicate with less electronegative Si central atoms provides strong O-Pb motif and improved passivation effect, delivering a champion efficiency of 17.26％ for -CsPbI2Br solar cells. Our strategy is also universally effective in improving the device performance of several commonly used perovskite compositions.关键词
Solar cell/Lead halide perovskite/Passivation/Oxysalt/Central atomKey words
Solar cell/Lead halide perovskite/Passivation/Oxysalt/Central atom引用本文复制引用
Ze Qing Lin,Hui Jun Lian,Bing Ge,Ziren Zhou,Haiyang Yuan,Yu Hou,Shuang Yang,Hua Gui Yang..Mediating the Local Oxygen-Bridge Interactions of Oxysalt/Perovskite Interface for Defect Passivation of Perovskite Photovoltaics[J].纳微快报（英文）,2021,13(11):266-279,14.基金项目
Ze Qing Lin and Hui Jun Lian contrib-uted equally to this work.This work was financially supported  （）
by National Natural Science Fund for Excellent Young Scholars  （）
(52022030),International(Regional)Cooperation and Exchange  （52022030）
Projects of the National Natural Science Foundation of China  （）
(51920105003),National Natural Science Fund for Distinguished  （51920105003）
Young Scholars(51725201),National Ten Thousand Talent Pro-gram for Young Top-notch Talent,National Natural Science Foun-dation of China(51902185,51972111),Innovation Program of  （51725201）
Shanghai Municipal Education Commission(E00014)and Shang-hai Engineering Research Center of Hierarchical Nanomaterials  （E00014）
(18DZ2252400).The authors also thank the Frontiers Science Center for Materiobiology and Dynamic Chemistry. （18DZ2252400）
