Highly stable and efficient perovskite solar cells produced via high-boiling point solvents and additive engineering synergistically

Qingbo Wei, Zhangwen Ye, Xiaodong Ren, Feng Fu, Zhou Yang, Shengzhong (Frank) Liu, Dong Yang

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

The active absorber layer plays a crucial role in a perovskite solar cell. Herein, we used high boiling point γ-butyrolactone (GBL) as the main solvent, Pb(SCN)2 and dimethyl sulfoxide (DMSO) as an effective additive in the FA0.83MA0.17Cs0.05PbI(3−x)Brx solution to improve the quality of perovskite films. The GBL will delay the crystallization speed of the perovskite, and lead to the grain growth assisted by thiocyanate. The synergistic effect of the solvent engineering and additive engineering is beneficial to the slow growth of the grain size. It is found that the addition of Pb(SCN)2 increases Gibbs free energy barrier for the nucleation, leading to the formation of fewer nuclei, which results in a high quality of perovskite absorbers with larger grains and smoother surfaces. The synergistic effect of solvents and Pb(SCN)2 on the morphology and photovoltaic performances is investigated. Compared to devices without the additive, the efficiency of devices with 5% Pb(SCN)2-doped FA0.83MA0.17Cs0.05PbI(3−x)Brx is raised to 19.01% from 15.21%. We believe this breakthrough regarding high efficiency perovskite solar cells will help for their transitions.

Original languageEnglish (US)
Pages (from-to)818-826
Number of pages9
JournalScience China Chemistry
Volume63
Issue number6
DOIs
StatePublished - Jun 1 2020

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

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