Reducing energy barrier of δ-to-α phase transition for printed formamidinium lead iodide photovoltaic devices

Medientyp: E-Artikel

Titel: Reducing energy barrier of δ-to-α phase transition for printed formamidinium lead iodide photovoltaic devices

Beteiligte: Xu, Zhenhua [Verfasser:in]; Zeng, Linxiang [Verfasser:in]; Hu, Jinlong [Verfasser:in]; Wang, Zhenya [Verfasser:in]; Zhang, Putao [Verfasser:in]; Brabec, Christoph [Verfasser:in]; Forberich, Karen [Verfasser:in]; Mai, Yaohua [Verfasser:in]; Guo, Fei [Verfasser:in]

Erschienen: Elsevier, 2022

Sprache: Englisch

DOI: https://doi.org/10.1016/j.nanoen.2021.106658

ISSN: 2211-3282; 2211-2855

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Beschreibung: 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.

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