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Short‐Chain Ligand‐Passivated Stable α‐CsPbI3 Quantum Dot for All‐Inorganic Perovskite Solar Cells
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2019-04-10 , DOI: 10.1002/adfm.201900991
Keqiang Chen 1, 2 , Qiaohui Zhong 2 , Wen Chen 2 , Binghua Sang 2 , Yingwei Wang 1 , Tingqiang Yang 2 , Yueli Liu 2 , Yupeng Zhang 1 , Han Zhang 1
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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%.

中文翻译:

用于全无机钙钛矿太阳能电池的短链配体钝化稳定α-CsPbI3量子点

立方相CsPbI 3(α-CsPbI 3)的钙钛矿量子点(QD)已经受到了广泛的关注,因为它们的全无机组合物和合适的带隙(1.73电子伏特)。然而,α-CsPbI 3量子点可能转换为δ-CsPbI 3(具有2.82电子伏特的间接带隙正交相),由于表面配体的易丢失。此外,常用的长链配体(油酸,OA和油胺,OLA)阻碍了光电器件中有效的电荷传输。为了减轻这些缺点,OA,OLA,辛酸,和辛胺用作加帽配合基用于合成高质量的α-CsPbI 3QD。结果表明,与仅用OA和OLA封端的QD相比,这些QD表现出出色的光学性能和长期稳定性。此外,具有较短配体的量子点表现出增强的电荷传输速率,从而将光伏器件的功率转换效率从7.76%提升至11.87%。
更新日期:2019-04-10
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