Improved crystallinity and self-healing effects in perovskite solar cells via functional incorporation of polyvinylpyrrolidone  

作　　者：Yunjuan Niu Dingchao He Zhengguo Zhang Jun Zhu Tulloch Gavin Polycarpos Falaras Linhua Hu 

机构地区：[1]Key Laboratory of Photovoltaic and Energy Conservation Materials,Institute of Solid State Physics,HFIPS,Chinese Academy of Sciences,Hefei 230031,Anhui,China [2]University of Science and Technology of China,Hefei 230026,Anhui,China [3]School of Chemistry and Chemical Engineering,North Minzu University,Yinchuan 750021,Ningxia,China [4]Special Display and Imaging Technology Innovation Center of Anhui Province,Anhui Province Key Laboratory of Measuring Theory and Precision Instrument,Academy of Opto-Electric Technology,Hefei University of Technology,Hefei 230009,Anhui,China [5]National Center for Scientific Research‘‘Demokritos”,Institute of Nanoscience and Nanotechnology(INN),15310 Agia Paraskevi Attikis,Athens,Greece [6]Greatcell Energy,280 Byrnes Rd,Wagga Wagga,NSW 2650,Australia

出　　处：《Journal of Energy Chemistry》2022年第5期12-18,共7页能源化学（英文版）

基　　金：supported by the National Key Research and Development Program of China (2017YFE0133800);the National Natural Science Foundation of China (51961165106);the West Light Foundation of the Chinese Academy of Sciences(XAB2020YW11);European Union’s HORIZON 2020 Marie Curie Innovative Training Network 764787 MAESTRO project。

摘　　要：Air moisture is the key issue for perovskites which invades the films and accelerates the damage of devices. Here, polyvinylpyrrolidone(PVP) is introduced to the methylammonium lead iodide(MAPbI_(3)) perovskite precursor to control crystal growth and endow the devices with self-healing ability in a moisture environment. The strong C=O...ΗAΝ hydrogen bonding interactions between PVP and MAPbI_(3) was confirmed by nuclear magnetic resonance measurements. By introducing hydrogen bonding in the MAPbI_(3)-based PSCs, we form a compact perovskite film of excellent electronic quality with a power conversion efficiency(PCE) of up to 20.32%. Furthermore, the O...ΗAΝ hydrogen bonding interactions at the grain boundaries suppress the decomposition of methylammonium cations and improve the recyclable dissolution–recrystallization of perovskite. As a result, the MAPbI_(3)-PVP based cells exhibited striking moisture stability and self-healing behavior, with negligible decay in efficiency after 500 h of operation in high humidity(65% ± 5% relative humidity) and rapid recovering ability after their removal from the humid environment.

关 键 词：Perovskite solar cells SELF-HEALING Carbonyl groups Hydrogen bonding 

分 类 号：TM914.4[电气工程—电力电子与电力传动] TQ317[化学工程—高聚物工业]