Highly Efficient and Stable MAPbI₃ Perovskite Solar Cell Induced by Regulated Nucleation and Ostwald Recrystallization

Materials
Zhen HuangTianjin Zhang

Abstract

Perovskite solar cells have attracted great attention in recent years, due to their high conversion efficiency and solution-processable fabrication. However, most of the solar cells with high efficiency in the literature are prepared employing TiO₂ as electron transport material, which needs sintering at a temperature higher than 450 °C, and is not applicable to flexible device and low-cost fabrication. Herein, the MAPbI₃ perovskite solar cells are fabricated at a low temperature of 150 °C with SnO₂ as the electron transport layer. By dropping the antisolvent of ethyl acetate onto the perovskite precursor films during the spin coating process, compact MAPbI₃ films without pinholes are obtained. The addition of ethyl acetate is found to play an important role in regulating the nucleation, which subsequently improves the compactness of the film. The quality of MAPbI₃ films are further improved significantly through Ostwald recrystallization by optimizing the thermal treatment. The crystallinity is enhanced, the grain size is enlarged, and the defect density is reduced. Accordingly, the prepared MAPbI₃ perovskite solar cell exhibits a record-high conversion efficiency, outstanding reproducibility, and stability, owing to t...Continue Reading

References

Apr 16, 2009·Journal of the American Chemical Society·Akihiro KojimaTsutomu Miyasaka
Feb 25, 2014·Journal of the American Chemical Society·Zonglong ZhuShihe Yang
Aug 30, 2014·Journal of the American Chemical Society·Yaron TidharSaar Kirmayer
Dec 21, 2016·ACS Applied Materials & Interfaces·Xiaodong RenShengzhong Frank Liu

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thermal treatment

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