Effects of precursor concentration and annealing temperature on CH3NH3PbI3 film crystallization and photovoltaic performance. (August 2017)

• Record Type: Journal Article
• Authors: Zheng, Yan-Zhen; Lai, Xue-Sen; Luo, Yi; Zhao, Er-Fei; Meng, Fan-Li; Zhang, Xiang-Feng; Tao, Xia
• Is Part Of: Journal of physics and chemistry of solids. Volume 107(2017)
• Page Start: 55
• Page End: 61
• Publication Date: 2017-08
• Subjects: Annealing temperature -- One-step process -- Perovskite solar cell -- Precursor concentration; Solids -- Periodicals; Solides -- Périodiques; Solids; Periodicals; 530.41
• DOI: 10.1016/j.jpcs.2017.03.020
• Languages: English
• ISSNs: 0022-3697

Abstract

Abstract: The ability to prepare homogeneous and highly crystalline planar perovskite films via the precise manipulation of a one-step solution-based crystallization process is still a key issue that hinders improvements to the ultimate photoelectric conversion efficiency (PCE) of devices. In this study, we prepared a series of planar CH3 NH3 PbI3 films using a chlorobenzene-assisted fast perovskite crystallization process with various precursor concentrations ranging from 30 to 50 wt% and subsequent annealing at 50–90 °C in order to investigate the effects of the precursor concentration and annealing temperature on crystallization and the photovoltaic performance. By precisely controlling the precursor concentration and annealing temperature, we obtained a homogeneous and highly crystalline planar perovskite film with high coverage under the optimized conditions (ca. 40 wt% and 70 °C), which led to sufficient light absorption and inhibited charge recombination, thereby yielding an enhanced PCE of 16.21%. Furthermore, the unsealed cell still retained a PCE of 10.98% after ambient air exposure for a period of 408 h. Graphical abstract: Highlights: Planar perovskite films were prepared via a one-step solution-process. Superior crystalline perovskite obtained by annealing temperature optimization. Uniform planar perovskite film was obtained by precise control of the concentration. A high photoelectric conversion efficiency of 16.21% was achieved.