Max Grischek, Pietro Caprioglio, Jiahuan Zhang, Francisco Pena-Camargo, Kari Sveinbjornsson, Fengshuo Zu, Dorothee Menzel, Jonathan Warby, Jinzhao Li, Norbert Koch, Eva Unger, Lars Korte, Dieter Neher, Martin Stolterfoht, Steve Albrecht
- 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 CsPbI2Br perovskite solar cells are investigated. Intensity-dependent photoluminescence measurements for different layer stacks reveal that n-i-p and p-i-n CsPbI2Br solar cells exhibit a strong mismatch between quasi-Fermi level splitting (QFLS) and V-OC. Specifically, the CsPbI2Br p-i-n perovskite solar cell has a QFLS-e center dot 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 CsPbI2Br 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 TiO2. Using ultraviolet photoelectron spectroscopy measurements, energy levelInorganic 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 CsPbI2Br perovskite solar cells are investigated. Intensity-dependent photoluminescence measurements for different layer stacks reveal that n-i-p and p-i-n CsPbI2Br solar cells exhibit a strong mismatch between quasi-Fermi level splitting (QFLS) and V-OC. Specifically, the CsPbI2Br p-i-n perovskite solar cell has a QFLS-e center dot 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 CsPbI2Br 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 TiO2. Using ultraviolet photoelectron spectroscopy measurements, energy level misalignment is identified as a possible reason for the QFLS-e center dot 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.…
MetadatenAuthor details: | Max GrischekORCiD, Pietro CaprioglioORCiDGND, Jiahuan Zhang, Francisco Pena-CamargoORCiDGND, Kari SveinbjornssonORCiD, Fengshuo ZuORCiD, Dorothee MenzelORCiD, Jonathan WarbyORCiDGND, Jinzhao Li, Norbert KochORCiD, Eva UngerORCiD, Lars KorteORCiD, Dieter NeherORCiDGND, Martin StolterfohtORCiDGND, Steve AlbrechtORCiD |
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DOI: | https://doi.org/10.1002/solr.202200690 |
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ISSN: | 2367-198X |
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Title of parent work (English): | Solar RRL |
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Publisher: | Wiley-VCH |
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Place of publishing: | Weinheim |
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Publication type: | Article |
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Language: | English |
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Date of first publication: | 2022/09/06 |
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Publication year: | 2022 |
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Release date: | 2024/05/23 |
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Tag: | CsPbI2Br; efficiency potentials; inorganic perovskites; photoluminescence; solar cells; voltage losses |
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Volume: | 6 |
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Issue: | 11 |
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Article number: | 2200690 |
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Number of pages: | 12 |
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Funding institution: | Helmholtz Association via HI-SCORE (Helmholtz International Research; School); Deutsche Forschungsgemeinschaft (DFG, German Research; Foundation) [498155101, SFB 951, SPP 2196, 182087777, 423749265,; 424709669]; Federal Ministry for Economic Affairs and Energy [03EE1017C,; 03EE1017A]; HyPerCells, a joint graduate school of the Potsdam; University; Helmholtz-Zentrum Berlin; Projekt DEAL; Heisenberg program |
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Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
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DDC classification: | 6 Technik, Medizin, angewandte Wissenschaften / 60 Technik / 600 Technik, Technologie |
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Peer review: | Referiert |
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Publishing method: | Open Access / Hybrid Open-Access |
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License (German): | CC-BY - Namensnennung 4.0 International |
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