期刊
ACS ENERGY LETTERS
卷 5, 期 10, 页码 3322-3329出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.0c01849
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资金
- National Key Research and Development Program of China [2016YFA0202402]
- Science and Technology Program of Jiangsu Province [BZ2020011]
- National Natural Science Foundation of China [61911530158, 51803144, 61674111]
- 111 Project
- Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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 similar to 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.
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