钙钛矿(结构)
带隙
紫外光电子能谱
能量转换效率
光致发光
钙钛矿太阳能电池
X射线光电子能谱
材料科学
开路电压
电压
热稳定性
太阳能电池
光电子学
费米能级
分析化学(期刊)
化学
化学工程
物理
结晶学
工程类
电子
有机化学
量子力学
色谱法
作者
Max Grischek,Pietro Caprioglio,Jiahuan Zhang,Francisco Peña‐Camargo,Kári Sveinbjörnsson,Fengshuo Zu,Dorothee Menzel,Jonathan Warby,Jinzhao Li,Norbert Koch,Eva Unger,Lars Korte,Dieter Neher,Martin Stolterfoht,Steve Albrecht
出处
期刊:Solar RRL
[Wiley]
日期:2022-09-20
卷期号:6 (11)
被引量:9
标识
DOI:10.1002/solr.202200690
摘要
Inorganic perovskite solar cells show excellent thermal stability, but the reported power conversion efficiencies are still lower than for organic–inorganic perovskites. This is mainly caused by lower open‐circuit voltages ( V OC s). Herein, the reasons for the low V OC in inorganic CsPbI 2 Br perovskite solar cells are investigated. Intensity‐dependent photoluminescence measurements for different layer stacks reveal that n–i–p and p–i–n CsPbI 2 Br solar cells exhibit a strong mismatch between quasi‐Fermi level splitting (QFLS) and V OC . Specifically, the CsPbI 2 Br p–i–n perovskite solar cell has a QFLS– e · V OC mismatch of 179 meV, compared with 11 meV for a reference cell with an organic–inorganic perovskite of similar bandgap. On the other hand, this study shows that the CsPbI 2 Br films with a bandgap of 1.9 eV have a very low defect density, resulting in an efficiency potential of 20.3% with a MeO–2PACz hole‐transporting layer and 20.8% on compact TiO 2 . Using ultraviolet photoelectron spectroscopy measurements, energy level misalignment is identified as a possible reason for the QFLS– e · V OC mismatch and strategies for overcoming this V OC limitation are discussed. This work highlights the need to control the interfacial energetics in inorganic perovskite solar cells, but also gives promise for high efficiencies once this issue is resolved.
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