Journal
RSC ADVANCES
Volume 11, Issue 38, Pages 23249-23258Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ra02260a
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Funding
- National Natural Science Foundation of China [61620106016/61835009/61804099/62074108/61775145/61975132]
- Guangdong Province Key Area RD Program [2019B110233004]
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In this study, a thin BAI layer was formed on the CH3NH3PbI3 surface and transformed into either a two-dimensional perovskite layer or the organic salt, effectively reducing trap-assisted charge recombination and increasing device stability. As a result, a remarkably enhanced PCE of 20.6% was achieved in the modified inverted perovskite solar cells.
Organic-inorganic lead halide perovskite solar cells have shown a rapid increase in power conversion efficiency (PCE) in the past decade. However, their performance still suffers from trap-assisted decline due to defects at the surface and grain boundaries in the polycrystalline active layer. In this study, a thin BAI layer was formed on the CH3NH3PbI3 surface, which was then transformed into either a two-dimensional (2D) perovskite layer (BA(2)PbI(4)) or the organic salt itself by controlling the post-annealing process. A variety of characterization results show that the 2D perovskites could effectively reduce the trap-assisted charge recombination and increase the device stability. Therefore, a remarkably enhanced PCE of 20.6% was achieved in the modified inverted perovskite solar cells.
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