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- Title
Short‐Chain Ligand‐Passivated Stable α‐CsPbI<sub>3</sub> Quantum Dot for All‐Inorganic Perovskite Solar Cells.
- Authors
Chen, Keqiang; Zhong, Qiaohui; Chen, Wen; Sang, Binghua; Wang, Yingwei; Yang, Tingqiang; Liu, Yueli; Zhang, Yupeng; Zhang, Han
- Abstract
Cubic phase CsPbI3 (α‐CsPbI3) perovskite quantum dots (QDs) have received extensive attention due to their all‐inorganic composition and suitable band gap (1.73 eV). However, α‐CsPbI3 QDs might convert to δ‐CsPbI3 (orthorhombic phase with indirect band gap of 2.82 eV) due to easy loss of surface ligands. In addition, commonly used long‐chain ligands (oleic acid, OA, and oleylamine, OLA) hinder efficient charge transport in optoelectronic devices. In order to relieve these drawbacks, OA, OLA, octanoic acid, and octylamine are used as capping ligands for synthesizing high‐quality α‐CsPbI3 QDs. The results indicate that these QDs exhibit excellent optical properties and long‐term stability compared to QDs capped only with OA and OLA. Moreover, QDs with shorter ligands exhibit an enhanced charge transport rate, which improves the power conversion efficiency of photovoltaic devices from 7.76% to 11.87%.
- Subjects
SILICON solar cells; DYE-sensitized solar cells; QUANTUM dots; SOLAR cells; PEROVSKITE; OCTANOIC acid; OPTOELECTRONIC devices
- Publication
Advanced Functional Materials, 2019, Vol 29, Issue 24, pN.PAG
- ISSN
1616-301X
- Publication type
Article
- DOI
10.1002/adfm.201900991