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진인수,정재웅 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
All-inorganic perovskite solar cells have attracted attention due to their excellent optical properties and high thermal stability, but energy loss in the photovoltaic performances is a challenge due to the trap-assisted recombination loss at the imperfect film morphology. In this work, we demonstrated the optimization of α-CsPbI<sub>2</sub>Br morphology including low defect density and large grain size by employing cesium chloride (CsCl) as an additive. The high-quality CsPbI2Br film grown with CsCl additive reveals high crystallinity and largely-grained morphology, which provides significantly reduced defect density and energy loss. As a result, we optimized the CsPbI<sub>2</sub>Br device with 1% CsCl additive, which shows power conversion efficiency (PCE) of 11.04% with a record open circuit voltage (VOC) of 1.33 V. The CsPbI<sub>2</sub>Br with CsCl showed good stability maintaining >60% of the initial efficiency being aged for >600 h in ambient atmosphere.
Molecular doping of CuSCN for high efficiency in inverted planar perovskite solar cells
진인수,정재웅 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Among many strategies for high-performance perovskite solar cells, interface engineering is considered as a promising approach to achieve high power conversion efficiency. In this study, we demonstrate that the molecular doping of copper thiocyanate (CuSCN) by 2,3,5,6-tetrafl uoro-7,7,8,8-tetracyanoquinodimethane (F4-TCNQ) significantly enhances the overall photovoltaic performance of perovskite solar cells (PSCs). The PSCs with optimized CuSCN exhibited an ∼35% increased efficiency as high as 15.01% in the inverted planar perovskite solar cells.