Hot-Air-Assisted Fully Air-Processed Barium Incorporated CsPbI2 Br Perovskite Thin Films for Highly Efficient and Stable All-Inorganic Perovskite Solar Cells

Nano Letters
Sawanta S MaliChang Kook Hong

Abstract

Replacement of conventional organic cations by thermally stable inorganic cations in perovskite solar cells (PSCs) is one of the promising approaches to make thermally stable photovoltaics. However, conventional spin-coating and solvent-engineering processes in a controlled inert atmosphere hamper the upscaling. In this study, we demonstrated a dynamic hot-air (DHA) casting process to control the morphology and stability of all-inorganic PSCs which is processed under ambient conditions and free from conventional harmful antisolvents. Furthermore, CsPbI2Br perovskite was doped with barium (Ba2+) alkaline earth metal cations (BaI2:CsPbI2Br). This DHA method facilitates the formation of uniform grain and controlled crystallization that makes stable all-inorganic PSCs which enables an intact black α-phase under ambient conditions. The DHA-processed BaI2:CsPbI2Br perovskite photovoltaics shows the champion power conversion efficiency (PCE) of 14.85% (reverse scan) for a small exposure area of 0.09 cm2 and 13.78% for a large area of 1 × 1 cm2 with excellent reproducibility. Interestingly, the hot-air-processed devices retain >92% of the initial efficiency after 300 h. This DHA method facilitates a wide processing window for upscaling...Continue Reading

References

Mar 19, 2014·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Seigo ItoPeter Lund
Jan 2, 2016·The Journal of Physical Chemistry Letters·Jan C BrauerNatalie Banerji
Sep 22, 2017·Journal of the American Chemical Society·Jia LiangZhong Jin
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Oct 3, 2018·Advanced Materials·Annie NgCharles Surya

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Citations

Jun 3, 2020·ACS Applied Materials & Interfaces·Jyoti V PatilChang Kook Hong

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