All-inorganic, hole-transporting-layer-free, carbon-based CsPbIBr2 planar perovskite solar cells by a two-step temperature-control annealing process. (15th March 2020)

• Record Type: Journal Article
• Authors: Wang, Cheng; Zhang, Junsen; Duan, Jipeng; Gong, Li; Wu, Jie; Jiang, Liangxiang; Zhou, Conghua; Xie, Haipeng; Gao, Yongli; He, Haiping; Lu, Jianguo; Fang, Zhishan; Lu, Bojing
• Is Part Of: Materials science in semiconductor processing. Volume 108(2020)
• Publication Date: 2020-03-15
• Subjects: All-inorganic perovskite solar cells -- CsPbIBr2 -- A two-step temperature-control process -- Different first-step annealing temperature; Semiconductors -- Periodicals; Integrated circuits -- Materials -- Periodicals; Semiconducteurs -- Périodiques; Circuits intégrés -- Matériaux -- Périodiques; Electronic journals; 621.38152
• DOI: 10.1016/j.mssp.2019.104870
• Languages: English
• ISSNs: 1369-8001

Abstract

Abstract: In this paper, all-inorganic CsPbIBr2 thin films were annealed by a two-step temperature-control process. All-inorganic, hole-transporting-layer-free, carbon-based planar perovskite solar cells (PSCs) with these CsPbIBr2 thin films (FTO/c-TiO2 /CsPbIBr2 /C) were fabricated. The effect of different first-step annealing temperatures during the two-step temperature-control process (50 °C/280 °C, 80 °C/280 °C, 100 °C/280 °C, 150 °C/280 °C, 180 °C/280 °C) on the photovoltaic conversion efficiency (PCE) of PSCs was investigated for the first time. When the first-step annealing temperature was 150 °C and the second-step annealing temperature was 280 °C, the highest efficiency of 8.31% was obtained. Without encapsulation, the solar cell could retain 97% of the initial PCE, when it was stored at 80 °C and zero humidity for 8 days. For comparison, solar cells with CsPbIBr2 films annealed by a one-step temperature-control process were fabricated. The highest PCE was 4.98%. From this, we could see that there is an increase of 66.9% in PCE, through using a two-step temperature-control annealing process. And also, in order to investigate why the PSCs by a two-step temperature-control annealing process has a higher PCE, all kinds of measurements were done for the first time. According to the results of the measurements, the perovskite film annealed by a two-step temperature-control process has a bigger crystal size, fewer grain boundaries, stronger PL and UV–vis absorption intensities, longer lifetime of minority carriers, less energy loss for hole transporting. Highlights: The effect of different first-step temperature during a two-step annealing process on PCEs of PSCs was studiedfor the first time. When the first-step annealing temperature was 150 °C and the second-step annealing temperature was 280 °C, the highest efficiency was 8.31%. Compared with solar cells annealed by a one-step annealing process, there is an increase of 66.9 % in PCE. The study on why the PSCs by a two-step annealing process has a higher PCE was done for the first time.