title: Enhanced performance of perovskite solar cells by modulating the Lewis acid-base reaction.
abstract: The Lewis acid-base reaction between PbI2and solvent molecules is popular in fabricating PbI2films by a two-step method for making perovskite solar cells. Here, we control the microstructure of PbI2films through modulating the Lewis acid-base reaction by adding a small amount of N-methyl pyrrolidone into PbI2/DMF solution. PbI2films with excellent crystallinity and full coverage are fabricated by spin-coating the mixed solution on the substrate, which leads to high quality perovskite layers with low recombination rate and high efficiency for carrier transfer. As a result, the power conversion efficiency of the best perovskite solar cells increases from 13.3% to 17.5%.
authors.affiliation: Key Lab for Advanced Materials Processing Technology of Education Ministry, State Key Lab of New Ceramic and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, P.R. China. jqwei@tsinghua.edu.cn.
authors.forename: Xiaobing
authors.initials: X
authors.lastname: Cao
authors.affiliation: Key Lab for Advanced Materials Processing Technology of Education Ministry, State Key Lab of New Ceramic and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, P.R. China. jqwei@tsinghua.edu.cn.
authors.forename: Changli
authors.initials: C
authors.lastname: Li
authors.affiliation: Key Lab for Advanced Materials Processing Technology of Education Ministry, State Key Lab of New Ceramic and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, P.R. China. jqwei@tsinghua.edu.cn.
authors.forename: Yahui
authors.initials: Y
authors.lastname: Li
authors.affiliation: Key Lab for Advanced Materials Processing Technology of Education Ministry, State Key Lab of New Ceramic and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, P.R. China. jqwei@tsinghua.edu.cn and Institute of Advanced Materials, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, P.R. China.
authors.forename: Fei
authors.initials: F
authors.lastname: Fang
authors.affiliation: Key Lab for Advanced Materials Processing Technology of Education Ministry, State Key Lab of New Ceramic and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, P.R. China. jqwei@tsinghua.edu.cn.
authors.forename: Xian
authors.initials: X
authors.lastname: Cui
authors.affiliation: Institute of Advanced Materials, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, P.R. China.
authors.forename: Youwei
authors.initials: Y
authors.lastname: Yao
authors.affiliation: Key Lab for Advanced Materials Processing Technology of Education Ministry, State Key Lab of New Ceramic and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, P.R. China. jqwei@tsinghua.edu.cn.
authors.forename: Jinquan
authors.initials: J
authors.lastname: Wei