Abstract
It is a great challenge to obtain the uniform films of bromide-rich perovskites such as CsPbBr3 in the two-step sequential solution process (two-step method), which was mainly due to the decomposition of the precursor films in solution. Herein, we demonstrated a novel and elegant face-down liquid-space-restricted deposition to inhibit the decomposition and fabricate high-quality CsPbBr3 perovskite films. This method is highly reproducible, and the surface of the films was smooth and uniform with an average grain size of 860 nm. As a consequence, the planar perovskite solar cells (PSCs) without the hole-transport layer based on CsPbBr3 and carbon electrodes exhibit enhanced power conversion efficiency (PCE) along with high open circuit voltage ( VOC). The champion device has achieved a PCE of 5.86% with a VOC of 1.34 V, which to our knowledge is the highest performing CsPbBr3 PSC in planar structure. Our results suggest an efficient and low-cost route to fabricate the high-quality planar all-inorganic PSCs.
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Jan 9, 2020·ACS Applied Materials & Interfaces·Weidong ZhuYue Hao
Jun 1, 2019·ACS Applied Materials & Interfaces·Weidong ZhuYue Hao
Jan 1, 2019·ACS Applied Materials & Interfaces·Qianni ZhangYue Hao
Jul 31, 2019·ACS Applied Materials & Interfaces·Xin LiJunyou Yang
Dec 26, 2019·ACS Applied Materials & Interfaces·Xiaobing CaoJinquan Wei
May 22, 2020·Nano Letters·Chen ChenYang Yang