Tuning the surface-passivating ligand anchoring position enables phase robustness in CsPbI3 perovskite quantum dot solar cells

Jahangeer Khan, Xuliang Zhang, Jianyu Yuan*, Yao Wang, Guozheng Shi, Robert Patterson, Junwei Shi, Xufeng Ling, Long Hu, Tom Wu, Songyuan Dai*, Wanli Ma*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Cubic CsPbI3 perovskite quantum dots (PQDs) with ideal optoelectronic properties are promising materials for solution-processed photovoltaics. However, their phase stability suffers from the weakly bound surface ligands. Here, we report the adoption of p-mercaptopyridine ligand post-treatment on PQDs and obtained enhanced electronic coupling and cubic phase robustness in comparison with the treatment using analogous o-mercaptopyridine and pyridine ligands. As a result, CsPbI3 PQDs solar cells achieved an efficiency of 14.25%. More importantly, the device stability was drastically improved, showing decent efficiency after storage under ambient conditions for ∼70 days. We revealed that tuning of the anchoring position can facilely enhance the ligand binding strength and surface coverage, providing efficient ways to significantly improve the performance and stability of PQD-based optoelectronic devices.

Original languageEnglish
Pages (from-to)3322-3329
Number of pages8
JournalACS Energy Letters
Volume5
Issue number10
DOIs
Publication statusPublished - 9 Oct 2020
Externally publishedYes

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