Introducing lead acetate into stoichiometric perovskite lewis acid-base precursor for improved solar cell photovoltaic performance

• Published in: Journal of alloys and compounds Vol. 767; pp. 829 - 837
• Main Authors: Li, Minghua, Zhang, Ruxiao, Guo, Yan, Huan, Yahuan, Xi, Jiahao, Li, Yong, Bai, Zhiming, Yan, Xiaoqin
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 30.10.2018; Elsevier BV
• Subjects: Alternative energy; Carrier lifetime; Crystal defects; Crystallization; Efficiency; Lead acetate; Lead acetates; Lewis acid; Lewis acid-base; Passivation; Perovskite; Perovskite solar cell; Perovskites; Photoluminescence; Photovoltaic cells; Precursors; Solar cells; Solar energy; Spectrum analysis; Lewis acid-base; Perovskite solar cell; Lead acetate; Passivation
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2018.07.190

Recently, numerous efforts have been reported on improving the properties of perovskite absorber, which has a direct and significant influence on the photovoltaic performance of solar cells. In this paper, lead acetate was introduced into stoichiometric lewis acid-base perovskite precursor to prepare high-quality methylammonium lead halide (MAPbI3) perovskite films. The trace lead acetate can facilitate the perovskite crystallization and induce grain size growth. After introducing lead acetate, the perovskite films show higher photoluminescence intensity and longer carrier lifetime due to less traps and defects, which is attributed to the improved film properties. The impedance spectroscopy measurements reveal that the lead acetate can decrease the series resistance and recombination resistance in the perovskite solar cells. As a result, the perovskite solar cells with lead acetate achieve an improved average efficiency of 18.06% (18.86% of best efficiency) compared with 16.87% of average efficiency of the control samples without lead acetate, while the hysteresis behavior is also significantly suppressed with the lead acetate. [Display omitted] •The lead acetate was introduced into the stoichiometric lewis acid-base precursor to prepare high-quality perovskite films.•The lead acetate can improve the perovskite crystallization and passivate the traps.•The device efficiency improved significantly with suppressive hysteresis behavior by introducing lead acetate.