A simple fabrication of high efficiency planar perovskite solar cells: controlled film growth with methylammonium iodide and green antisolvent sec-butyl alcohol

• Published in: Journal of materials chemistry. C, Materials for optical and electronic devices Vol. 8; no. 36; pp. 1256 - 12567
• Main Authors: Qiu, Linlin, Dong, Lika, Mei, Deqiang, Chen, Wei-Hsiang, Song, Lixin, Wang, Jieqiong, Zou, Jiacheng, Jiang, Pei-Cheng, Du, Pingfan, Xiong, Jie
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 28.09.2020
• Subjects: Butanol; Energy conversion efficiency; Film growth; Grain size; Perovskites; Photovoltaic cells; Precursors; Solar cells
• ISSN: 2050-7526; 2050-7534
• DOI: 10.1039/d0tc02535f

Perovskite films can be prepared using sec-butyl alcohol (2-BA) by a one-step antisolvent assisted method. However, 2-BA dissolves a necessary perovskite precursor, methylammonium iodide, CH 3 NH 3 I, (MAI), which is lost during the fabrication, leaving behind residues of another perovskite precursor, PbI 2 . The resulting perovskite films show reduced power conversion efficiency (PCE) and poor stability to ambient conditions. In this work, we propose an elegant strategy, i.e. , the introduction of a small amount of MAI dissolved in the antisolvent 2-BA (1 mg mL −1 ). The additional MAI can react with the residual PbI 2 during the fabrication to form the desired organic-inorganic hybrid perovskite material, CH 3 NH 3 PbI 3 . The high-quality of the perovskite films obtained can provide larger grain sizes and smoother surfaces, with an ideal PCE of 19.29% and superior moisture stabilities. Perovskite films can be prepared using sec-butyl alcohol (2-BA) by a one-step antisolvent assisted method.