This title appears in the Scientific Report :
2022
Please use the identifier:
http://hdl.handle.net/2128/33434 in citations.
Please use the identifier: http://dx.doi.org/10.1016/j.nanoen.2021.106658 in citations.
Reducing energy barrier of δ-to-α phase transition for printed formamidinium lead iodide photovoltaic devices
Reducing energy barrier of δ-to-α phase transition for printed formamidinium lead iodide photovoltaic devices
Recent progress in perovskite photovoltaics has witnessed a growing interest in formamidinium lead iodide (FAPbI3), primarily due to its high efficiency potential and excellent stability. However, the high energy barrier of δ-to-α phase transition presents a major hurdle to fabricate phase-pure α-FA...
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Personal Name(s): | Xu, Zhenhua |
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Zeng, Linxiang / Hu, Jinlong / Wang, Zhenya / Zhang, Putao / Brabec, Christoph / Forberich, Karen / Mai, Yaohua (Corresponding author) / Guo, Fei (Corresponding author) | |
Contributing Institute: |
Helmholtz-Institut Erlangen-Nürnberg Erneuerbare Energien; IEK-11 |
Published in: | Nano energy, 91 (2022) S. 106658 - |
Imprint: |
Amsterdam [u.a.]
Elsevier
2022
|
DOI: |
10.1016/j.nanoen.2021.106658 |
Document Type: |
Journal Article |
Research Program: |
Materials and Interfaces |
Link: |
OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1016/j.nanoen.2021.106658 in citations.
Recent progress in perovskite photovoltaics has witnessed a growing interest in formamidinium lead iodide (FAPbI3), primarily due to its high efficiency potential and excellent stability. However, the high energy barrier of δ-to-α phase transition presents a major hurdle to fabricate phase-pure α-FAPbI3 layers. Here, we report a two-step phase transition process to deposit high-quality photovoltaic α-FAPbI3 films by printing method. This is realized by judicious selection of a Lewis base N-methyl-2-pyrrolidone (NMP) and its counter Lewis acid, which enables the regulation of intermediary phase to reduce the energy barrier. With fine tuning the phase transition pathway, phase-pure and stable α-FAPbI3 perovskite films are obtained, which yield solar devices with a champion efficiency of 21.35%. The printed mini-modules with active areas of 12.32 cm2 and 55.44 cm2 are also fabricated, giving efficiencies of 17.07% and 14.17%, respectively. This work provides new insights of α-FAPbI3 crystallization for constructing efficient and stable printed photovoltaic devices. |