Phase Transformation Barrier Modulation of Cspbi3 Films Via Pbi3− Complex for Efficient All-Inorganic Perovskite Photovoltaics
| Autor: | Zhiwen Qiu, Feng Wang, Chenyue Wang, Cheng Zhu, Hao Wang, Qi Chen, Yihua Chen, Yu Zhang, Zhenyu Guo, Nengxu Li, Huachao Zai, José Manuel Vicent-Luna, Shuxia Tao, Huanping Zhou |
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| Přispěvatelé: | Materials Simulation & Modelling, Computational Materials Physics, Center for Computational Energy Research |
| Rok vydání: | 2022 |
| Předmět: |
Pb−I complex
History Polymers and Plastics Stoichiometry modulation Renewable Energy Sustainability and the Environment General Materials Science SDG 7 - Affordable and Clean Energy Electrical and Electronic Engineering Business and International Management Phase transformation SDG 7 – Betaalbare en schone energie Industrial and Manufacturing Engineering Cesium lead iodide |
| Zdroj: | Nano Energy, 99:107388. Elsevier |
| ISSN: | 1556-5068 2211-2855 |
| Popis: | Cesium lead iodide (CsPbI3) has gained great attention due to its thermal stability and appropriate bandgap (≈1.73 eV) at black (γ) phase potentially suitable for tandem solar cells. However, it is challenging to obtain CsPbI3 film with desired black phase. Herein, we fabricate kinetically favorable γ-CsPbI3 thin films by stoichiometry modulation, where in-situ 2D GIWAXS measurement was innovatively performed to illustrate the phase transition process of the precursor films, to aid a full picture study on the entire film evolution process. Conceptually different from introducing other extrinsic species, the cogenetic doping by excessive cesium iodide is found to tailor energy barriers for phase transformations during both the film formation and ageing process simultaneously. During film growth, excessive CsI affects the formation of Pb−I complex in the precursor solution, which facilitates the δ to γ phase transformation. Also, the Cs-rich resultant film could suppress γ to δ phase transformation. The corresponding CsPbI3 solar cells deliver a PCE of 16.68% without performance loss at continuous maximum power point output (MPP) for ~175 h under continuous illumination in a N2 glovebox. This work highlights the importance of precursors chemistry and provides guidelines to adjust the phase transformation barrier in CsPbI3 films without any foreign additives. |
| Databáze: | OpenAIRE |
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