Dissolution and recrystallization of perovskite induced by N-methyl-2-pyrrolidone in a closed steam annealing method

查看全文 作　　者：Lili [1,2]Zhi;Yanqing [2,3]Li;Xiaobing [4]Cao;Yahui [4]Li;Xian [4]Cui;Lijie [1]Ci;Jinquan [4]Wei 机构地区：[1]SDU & Rice Joint Center for Carbon Nanomaterials, Key Laboratory for Liquid-Solid Structural Evolution & Processing of Materials (Ministry of Education),School of Materials Science and Engineering, Shandong University;[2]Department of Physics, Changji College;[3]State Key Laboratory of Crystal Materials, Shandong University;[4]State Key Lab of New Ceramic and Fine Processing, Education Ministry Key Laboratory for Advanced Materials Processing Technology, School of Materials Science and Engineering, Tsinghua University 出　　处：《Journal of Energy Chemistry》索引2019年第28卷第3期,共6页 基　　金：financially supported by the National Natural Science Foundation of China(Grant No.21463002);Startup Funding of Distinguished Professorship of '1000 Talents Program'(31370086963030);Shenzhen Jiawei Photovoltaic Lighting Co.,Ltd.;Tsinghua University Initiative Scientific Research Program(20161080165);Natural Science Foundation of Xinjiang Uygur Autonomous Region(No.2016D01C008);Opening Project of State Key laboratory of Crystal Material(No.KF1610);Scientific Research Program of the Higher Education Institution of Xinjiang(XJEDU2017M038) 摘　　要：High quality perovskite films with large columnar grains are greatly desired for efficient perovskite solar cells. Here, low volatility N-methyl-2-pyrrolidone(NMP) was added in MAI/IPA solution in a two-step spin-coating method, which promoted the conversion of lead iodide to perovskite. The perovskite films were annealed by a closed-steam annealing method to prolong the recrystallization process of perovskite films assisted by the residual NMP. It leaded to high quality CH_3NH_3PbI_3 perovskite films with large columnar grains due to its enhancement of the Oswald ripening. The large grain perovskite film leaded to efficient carrier transformation and injection, and low recombination. The photovoltaic performance of the perovskite solar cells was improved significantly. 关 键 词：PEROVSKITE solar cell N-METHYL-2-PYRROLIDONE (NMP) DISSOLUTION and RECRYSTALLIZATION Closed-steam ANNEALING Oswald RIPENING