文献类型：期刊文献

英文题名：A Gradient Heterostructure Based on Tolerance Factor in High-Performance Perovskite Solar Cells with 0.84 Fill Factor

作者：Qiao, Hong Wei[1];Yang, Shuang[2];Wang, Yun[3];Chen, Xiao[1];Wen, Tian Yu[1];Tang, Li Juan[1];Cheng, Qilin[1];Hou, Yu[1];Zhao, Huijun[3];Yang, Hua Gui[1]

机构：[1]East China Univ Sci & Technol, Key Lab Ultrafine Mat, Minist Educ, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China;[2]Shandong Univ, Key Lab Liquid Solid Struct Evolut & Proc Mat, Minist Educ, Sch Mat Sci & Engn, Jinan 250061, Shandong, Peoples R China;[3]Griffith Univ, Ctr Clean Environm & Energy, Gold Coast Campus, Southport, Qld 4222, Australia

年份：2019

卷号：31

期号：5

外文期刊名：ADVANCED MATERIALS

收录：;EI(收录号：20184906209311);WOS:【SCI-EXPANDED(收录号:WOS:000457802000021)】；

基金：H.W.Q., S.Y., and Y.W. contributed equally to this work. This work was financially supported by the National Natural Science Foundation of China (51602103), the National Natural Science Funds for Distinguished Young Scholar (51725201), Young Elite Scientists Sponsorship Program by CAST (2017QNRC001), Shanghai Pujiang Program (18PJD009), "Chen Guang" Project supported by Shanghai Municipal Education Commission and Shanghai Education Development Foundation (15CG26), Fundamental Research Funds for the Central Universities (222201718002), and the Major Research plan of the National Natural Science Foundation of China (91534202).

语种：英文

外文关键词：charge transfer; fill factor; gradient heterostructures; perovskite solar cells; tolerance factor

摘要：A gradient heterosturcture is one of the basic methods to control the charge flow in perovskite solar cells (PSCs). However, a classical route for gradient heterosturctures is based on the diffusion technique, in which the guest ions gradually diffuse into the films from a concentrated source of dopants. The gradient heterosturcture is only accessible to the top side, and may be time consuming and costly. Here, the "intolerant" n-type heteroatoms (Sb3+, In3+) with mismatched cation sizes and charge states can spontaneously enrich two sides of perovskite thin films. The dopants at specific sides can be extracted by a typical hole-transport layer. Theoretical calculations and experimental observations both indicate that the optimized charge management can be attributed to the tailored band structure and interfacial electronic hybridization, which promote charge separation and collection. The strategy enables the fabrication of PSCs with a spontaneous graded heterojunction showing high efficiency. A champion device based on Sb3+ doped film shows a stabilized power-conversion efficiency of 21.04% with a high fill factor of 0.84 and small hysteresis.