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

Xu Z, Zeng L, Hu J, Wang Z, Zhang P, Brabec C, Forberich K, Mai Y, Guo F (2022)

Publication Type: Journal article

Publication year: 2022

Journal

Nano Energy Elsevier

Book Volume: 91

Article Number: 106658

DOI: 10.1016/j.nanoen.2021.106658

Abstract

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.

Authors with CRIS profile

Christoph Brabec Institute Materials for Electronics and Energy Technology (i-MEET)

Involved external institutions

Jinan University CN China (CN) Zhejiang University CN China (CN) Henan University / 河南大学 CN China (CN) Forschungszentrum Jülich / Research Centre Jülich (FZJ) DE Germany (DE)

How to cite

APA:

Xu, Z., Zeng, L., Hu, J., Wang, Z., Zhang, P., Brabec, C.,... Guo, F. (2022). Reducing energy barrier of δ-to-α phase transition for printed formamidinium lead iodide photovoltaic devices. Nano Energy, 91. https://dx.doi.org/10.1016/j.nanoen.2021.106658

MLA:

Xu, Zhenhua, et al. "Reducing energy barrier of δ-to-α phase transition for printed formamidinium lead iodide photovoltaic devices." Nano Energy 91 (2022).

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