Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 29, Issue 24, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201900991
Keywords
all-inorganic perovskite solar cell; ligand passivated; stability; alpha-CsPbI3 quantum dot
Categories
Funding
- National Natural Science Foundation of China [11674258, 51602305, 51702219]
- International Science & Technology Cooperation Program of China [2013DFR50710]
- Fundamental Research Funds for the Central Universities [2017II22GX]
- Nature Science Foundation of Guangdong Province [2018A030313401]
- Science and Technology Innovation Commission of Shenzhen [JCYJ20170818141519879, JCYJ20170818141429525, JCYJ20180206121837007]
- Shenzhen Nanshan District Pilotage Team Program [LHTD20170006]
- Postdoctoral Research Foundation of China [2018M633102, 2017M620383, 2017M622758]
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Cubic phase CsPbI3 (alpha-CsPbI3) perovskite quantum dots (QDs) have received extensive attention due to their all-inorganic composition and suitable band gap (1.73 eV). However, alpha-CsPbI3 QDs might convert to delta-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 alpha-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%.
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