期刊
NANO ENERGY
卷 77, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2020.105309
关键词
Inorganic perovskite; Bandgap; Solar cells; Stability
类别
资金
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [NRF-2018R1C1B6008028, 2019K2A9A2A08000132, 2018R1A4A1024 691]
- Korea Institute of Energy Technology Evaluation and Planning(KETEP) - Korea government (MOTIE) [20193091010160]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20193091010160] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The instability of organic/inorganic hybrid perovskite solar cells (PSCs) has motivated the development of the inorganic halide PSCs. However, the representative inorganic CsPbI3 still suffers from phase instability in ambient air and an unfavorable wide bandgap (1.75 eV), thereby limiting its efficiency. In this study, a binary metal composition of Pb:Sn = 4:6 in CsPb1-xSnxI3 is found to stabilize the cubic CsPbI3 phase and reduce its bandgap. Based on the parental CsPb0.4Sn0.6I3, compositional engineering is further conducted for CsPb0.4Sn0.6I3 Br-y(y) perovskites. After introducing a suitable Br content (y = 0.6), there are remarkable improvements in the crystalline quality and a denser morphology in the perovskite films. Furthermore, in the novel inorganic CsPb(0.4)ASn(0.6)I(2.4)Br(0.6) perovskite, trap-assisted recombination is effectively suppressed, with a desirable narrow bandgap of 1.35 eV. As a result, the corresponding PSC delivered an unprecedented efficiency of 12.34%, which is the highest among the inorganic Sn-rich (Sn > 50%) PSCs reported to date. Additionally, the unencapsulated PSC demonstrates impressive long-term air stability, which exceeds the performance of 100% Pb-based inorganic CsPbI3 and/or CsPbI2Br PSCs reported. This near-infrared absorbing (similar to 930 nm) inorganic PSC with exceptional efficiency, durability and Pb-reduction generates a promising route for further progress of perovskite-based photovoltaics.
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