Chelate-Pb Intermediate Engineering for High-Efficiency Perovskite Solar Cells

Jinzhi Niu, Dong Yang, Zhou Yang, Dapeng Wang, Xuejie Zhu, Xiaorong Zhang, Shengnan Zuo, Jiangshan Feng, Shengzhong Frank Liu

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


Crystallization quality and grain size are key factors in fabricating high-performance planar-type perovskite photovoltaics. Herein, we used 1,8-octanedithiol as an effective additive in the [HC(NH2)2]0.95Cs0.05PbI3 (FA0.95Cs0.05PbI3) solution to improve the FA0.95Cs0.05PbI3 film quality via solution processing. 1,8-Octanedithiol would coordinate with lead to form the chelate-Pb compound, leading to smaller Gibbs free energy during the perovskite crystallization process, facilitating formation of high-quality perovskite films with larger grains, smoother surfaces, lower electron trap densities, and longer carrier lifetimes compared to the nonadditive ones. As a result, the champion efficiency for devices with 3% 1,8-octanedithiol-doped FA0.95Cs0.05PbI3 is raised to 19.36% from 18.39% of a device without the additive. The new technique is a promising way to fabricate perovskite photovoltaics with high performance.

Original languageEnglish (US)
Pages (from-to)14744-14750
Number of pages7
JournalACS Applied Materials and Interfaces
Issue number17
StatePublished - May 2 2018

All Science Journal Classification (ASJC) codes

  • Materials Science(all)


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