Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 24, Pages 27176-27183Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c04577
Keywords
perovskite solar cells; inorganic cesium lead mixed-halide; niobium incorporation; hot-air method; high efficiency; stability
Funding
- Priority Research Centre Program through the National Research Foundation of Korea (NRF) - Ministry of Education, Science, and Technology [2020R1A2C2004880, NRF-2018R1A6A1A03024334]
- Korea Research Fellowship Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT, and Future Planning [2016H1D3A1909289]
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Inorganic cesium lead halide perovskite (CsPbX3) is a promising light-harvesting material to increase the thermal stability and the device performance as compared to the organic-inorganic hybrid counterparts. However, the photoactive stability at ambient conditions is an unresolved issue. Here, we studied the influence of Nb5+ ions' incorporation in the CsPbI2Br perovskite processed at ambient conditions. Our results exhibited that 0.5% Nb-incorporated CsPb1-xNbxI2Br (herein x = 0.005) thin films show excellent uniformity and improved grain size because of the optimum concentration of Nb5+ doping and hot-air flow. The improved grain size and uniform film thickness deliver a superior interface between the CsPb1-xNbxI2Br layer and the hole-transporting material. The fabricated all-inorganic perovskite solar cell (IPVSC) devices exhibited the Nb5+ cation incorporation which enables decreased charge recombination, leading to negligible hysteresis. The champion device produces an open-circuit voltage (V-OC) as high as 1.317 V. The IPVSC device containing a CsPb0.995Nb0.005I2Br composition delivers the highest power conversion efficiency of 16.45% under a 100 mW cm(-2) illumination and exhibits a negligible efficiency loss over 96 h in ambient conditions.
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