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 language | English |
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Pages (from-to) | 3322-3329 |
Number of pages | 8 |
Journal | ACS Energy Letters |
Volume | 5 |
Issue number | 10 |
DOIs | |
Publication status | Published - 9 Oct 2020 |
Externally published | Yes |