文献类型：期刊文献

英文题名：Surface Electronic Modification of Perovskite Thin Film with Water-Resistant Electron Delocalized Molecules for Stable and Efficient Photovoltaics

作者：Wen, Tian Yu[1];Yang, Shuang[1];Liu, Peng Fei[1];Tang, Li Juan[1];Qiao, Hong Wei[1];Chen, Xiao[1];Yang, Xiao Hua[1];Hou, Yu[1];Yang, Hua Gui[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Ultrafine Mat, Minist Educ, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2018

卷号：8

期号：13

外文期刊名：ADVANCED ENERGY MATERIALS

收录：;EI(收录号：20180404674169);WOS:【SCI-EXPANDED(收录号:WOS:000431613800023)】；

基金：T.Y.W. and S.Y. contributed equally to this work. This work was financially supported by National Natural Science Foundation of China (21373083, 21573068, and 51602103), Young Elite Scientists Sponsorship Program by CAST (2017QNRC001), Fundamental Research Funds for the Central Universities (WD1514003, 222201718002 and 222201514301), China Postdoctoral Science Foundation Funded Project (2015M581547 and 2016T90342), "Chen Guang" Project supported by Shanghai Municipal Education Commission and Shanghai Education Development Foundation (15CG26 and 13CG27), the Major Research plan of the National Natural Science Foundation of China (91534202), and Shanghai Sailing Program (16YF1402100).

语种：英文

外文关键词：delocalization; functionalization; perovskite; solar cells; stability

摘要：Although the efficiency of perovskite solar cells (PSCs) is close to crystalline silicon solar cells, the instability of perovskite, especially in humid condition, still hinders its commercialization. As an effective method to improve their stability, surface functionalization, by using hydrophobic molecules, has been extensively investigated, but usually accompanied with the loss of device efficiencies owing to their intrinsic electrical insulation. In this work, for the first time, it is demonstrated that 3-alkylthiophene-based hydrophobic molecules can be used as both water-resistant and interface-modified layers, which could simultaneously enhance both stability and performance significantly. Benefitting from their unique structures of thiophene rings, the p-electrons are highly delocalized and thus enhance the charge transfer and collection at the interface. The device based on 3-hexylthiophene treatment exhibits a champion energy conversion efficiency of 19.89% with a dramatic 10% enhancement compared with the pristine one (18.08%) of Cs-0.05 FA(0.81) MA(0.14) PbBr0.45 I-2.55-based PSCs. More importantly, the degradation of the long-term efficiency of unsealed device is less than 20% in Cs-0.05 FA(0.81) MA(0.14) PbBr0.45I2.55-based PSCs after more than 700 h storage in air. This finding provides an avenue for further improvement of both the efficiency and stability of PSCs.