1. Synergistic Effects of Lead Thiocyanate Additive and Solvent Annealing on the Performance of Wide-Bandgap Perovskite Solar Cells
- Author
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Alexander J. Cimaroli, Randy J. Ellingson, Dewei Zhao, Weiwei Meng, Lei Guan, Niraj Shrestha, Changlei Wang, Kai Zhu, Yanfa Yan, Rasha A. Awni, Yue Yu, Corey R. Grice, and Wei-Qiang Liao
- Subjects
Materials science ,Thiocyanate ,Renewable Energy, Sustainability and the Environment ,Annealing (metallurgy) ,Band gap ,Energy conversion efficiency ,Inorganic chemistry ,Energy Engineering and Power Technology ,Perovskite solar cell ,02 engineering and technology ,Carrier lifetime ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Grain size ,0104 chemical sciences ,chemistry.chemical_compound ,Fuel Technology ,chemistry ,Chemistry (miscellaneous) ,Materials Chemistry ,Thin film ,0210 nano-technology - Abstract
We show that the cooperation of lead thiocyanate additive and a solvent annealing process can effectively increase the grain size of mixed-cation lead mixed-halide perovskite thin films while avoiding excess lead iodide formation. As a result, the average grain size of the wide-bandgap mixed-cation lead perovskite thin films increases from 66 ± 24 to 1036 ± 111 nm, and the mean carrier lifetime shows a more than 3-fold increase, from 330 ns to over 1000 ns. Consequently, the average open-circuit voltage of wide-bandgap perovskite solar cells increases by 80 (70) mV, and the average power conversion efficiency (PCE) increases from 13.44 ± 0.48 (11.75 ± 0.34) to 17.68 ± 0.36 (15.58 ± 0.55)% when measured under reverse (forward) voltage scans. The best-performing wide-bandgap perovskite solar cell, with a bandgap of 1.75 eV, achieves a stabilized PCE of 17.18%.
- Published
- 2017