Journal
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
Volume 108, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.mssp.2019.104870
Keywords
All-inorganic perovskite solar cells; CsPbIBr2; A two-step temperature-control process; Different first-step annealing temperature
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Funding
- National Natural Science Foundation of China, China [51302021]
- Postgraduate Research Innovation Project of Changsha University of Technology, China [CX2019SS41]
- Research-based Learning and Innovative Experiment Program for College Students in Hunan Province in 2018, China
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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 degrees C/280 degrees C, 80 degrees C/280 degrees C, 100 degrees C/280 degrees C, 150 degrees C/280 degrees C, 180 degrees C/280 degrees C) on the photovoltaic conversion efficiency (PCE) of PSCs was investigated for the first time. When the first-step annealing temperature was 150 degrees C and the second-step annealing temperature was 280 degrees 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 degrees 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.
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