High quality perovskite films fabricated from Lewis acid-base adduct through molecular exchange

被引：46

作者：

Cao, X. B. ^{[1
]}

Li, Y. H. ^{[1
]}

Fang, F. ^{[1
,2
]}

Cui, X. ^{[1
]}

Yao, Y. W. ^{[2
]}

Wei, J. Q. ^{[1
]}

机构：

[1] Tsinghua Univ, Key Lab Adv Mat Proc Technol, State Key Lab New Ceram & Fine Proc, Educ Minist,Sch Mat Sci & Engn, Beijing 100084, Peoples R China

[2] Tsinghua Univ, Grad Sch Shenzhen, Inst Adv Mat, Shenzhen 518055, Peoples R China

来源：

RSC ADVANCES | 2016年 / 6卷 / 75期

基金：

中国国家自然科学基金;

关键词：

SOLAR-CELLS; SEQUENTIAL DEPOSITION; SOLVENT MIXTURES; EFFICIENCY; PERFORMANCE; PASSIVATION; CONVERSION; IONS; N; N-DIMETHYLACETAMIDE; N-DIMETHYLFORMAMIDE;

D O I：

10.1039/c6ra15378j

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We describe a facile method to fabricate high quality CH3NH3PbI3 films with smooth surface and without residual PbI2 through molecular exchange, rather than ionic intercalation. It forms a Lewis acid- base adduct of PbI2.xDMF when PbI2 precipitates from DMF solution. The lattice of PbI2 is expanded more than 30% due to the intercalation of DMF. With the lattice expansion, CH3NH3I (MAI) diffuses into the PbI2.xDMF lattice easily, and the PbI2.xDMF converts completely to CH3NH3PI3 by molecular exchange between DMF and MAI. The lattice volume changes little during the molecular exchange in PbI2.xDMF. Thus, it is easy to fabricate high quality perovskite films from the Lewis adduct of PbI2.xDMF. The perovskite solar cells fabricated from the Lewis adduct exhibit higher photovoltaic performance than those from the PbI2 films. This work reveals the important role of common solvent in controlling the quality of perovskite films.

引用

页码：70925 / 70931

页数：7

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