Manipulating Crystal Growth and Secondary Phase PbI_(2)to Enable Efficient and Stable Perovskite Solar Cells with Natural Additives  

作　　者：Yirong Wang Yaohui Cheng Chunchun Yin Jinming Zhang Jingxuan You Jizheng Wang Jinfeng Wang Jun Zhang 

机构地区：[1]Institute of Chemistry,Chinese Academy of Sciences(CAS),Beijing 100190,People’s Republic of China [2]University of Chinese Academy of Sciences,Beijing 100049,People’s Republic of China [3]Nanjing University,Nanjing 210023,People’s Republic of China [4]Wuhan Textile University,Wuhan 430200,People’s Republic of China

出　　处：《Nano-Micro Letters》2024年第9期432-448,共17页纳微快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.52173292 and U2004211);the Youth Innovation Promotion Association CAS(No.2018040).

摘　　要：In perovskite solar cells(PSCs),the inherent defects of perovskite film and the random distribution of excess lead iodide(PbI_(2))prevent the improvement of efficiency and stability.Herein,natural cellulose is used as the raw material to design a series of cellulose derivatives for perovskite crystallization engineering.The cationic cellulose derivative C-Im-CN with cyano-imidazolium(Im-CN)cation and chloride anion prominently promotes the crystallization process,grain growth,and directional orientation of perovskite.Meanwhile,excess PbI_(2)is transferred to the surface of perovskite grains or formed plate-like crystallites in local domains.These effects result in suppressing defect formation,decreasing grain boundaries,enhancing carrier extraction,inhibiting non-radiative recombination,and dramatically prolonging carrier lifetimes.Thus,the PSCs exhibit a high power conversion efficiency of 24.71%.Moreover,C-Im-CN has multiple interaction sites and polymer skeleton,so the unencapsulated PSCs maintain above 91.3%of their initial efficiencies after 3000 h of continuous operation in a conventional air atmosphere and have good stability under high humidity conditions.The utilization of biopolymers with excellent structure-designability to manage the perovskite opens a state-of-the-art avenue for manufacturing and improving PSCs.

关 键 词：PEROVSKITE Solar cells Defect passivation Biomass additives Crystal orientation 

分 类 号：TM914.4[电气工程—电力电子与电力传动] O78[理学—晶体学]