Effective solvent-additive enhanced crystallization and coverage of absorber layers for high efficiency formamidinium perovskite solar cells. Issue 62 (14th June 2016)

• Record Type: Journal Article
• Authors: Wei, Qingbo; Yang, Dong; Yang, Zhou; Ren, Xiaodong; Liu, Yucheng; Feng, Jiangshan; Zhu, Xuejie; Liu, Shengzhong (Frank)
• Is Part Of: RSC advances. Volume 6:Issue 62(2016)
• Page Start: 56807
• Page End: 56811
• Publication Date: 2016-06-14
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra10007d
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : For a high efficiency of planar-type perovskite solar cells, a good crystallization and high surface coverage of the absorber films are required. Abstract : For a high efficiency of planar-type perovskite solar cells, a good crystallization and high surface coverage of the absorber films are required. However, these two key factors are still the main challenges in perovskite film formation to date. Here, 1-chloronaphthalene (CN) is used as a solvent-additive in the precursor HC(NH2 )2 PbI3 (FAPbI3 ) solution to control the crystallization and surface coverage of the FAPbI3 films by adjusting its concentration. The CN chlorinated monodentate ligand is likely to temporarily chelate with Pb 2+ during the crystal growth, facilitating homogenous nucleation to form relatively high quality FAPbI3 films. Meanwhile, the CN additive with a high boiling point delays the growth rate of the FAPbI3 film, which helps to form homogenous continuous FAPbI3 films with fewer pin-holes. As a result, with the addition of the CN solvent-additive, the efficiency of the FAPbI3 planar-type solar cells is enhanced to 16.53%.