期刊
ADVANCED FUNCTIONAL MATERIALS
卷 32, 期 1, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202106779
关键词
ambient stability; electrochemical delamination; fluorinated black phosphorus; hole extraction; perovskite solar cells
类别
资金
- National Key RAMP
- D Program of China [2018YFE0103500]
- National Natural Science Foundation of China [61965010, 61761016]
- Start-up Research Foundation of Hainan University [KYQD(ZR)1906]
- Hainan Provincial Natural Science Foundation of China [420RC523]
- Hainan Science and Technology Major Project [ZDKJ2019013, ZDKJ2020011]
This study introduces a feasible strategy to enhance the photovoltaic performance and long-term stability of black phosphorus-based perovskite solar cells by introducing high-quality fluorinated BP nanosheets with improved interfacial properties. The optimized interface structure results in higher power conversion efficiency and improved stability of the devices.
Extraordinary electronic and photonic features (e.g., tunable direct bandgap, high ambipolar carrier mobility) render few-layer black phosphorus (BP) nanosheets/quantum dots an important optoelectronic material. However, most of the BP applied in metal halide perovskite solar cells (PSCs) are produced by sonication-assisted liquid exfoliation, which inevitably brings inferior electronic properties, thus leading to limited beneficial effects. Furthermore, this study uncovers that the intrinsic instability of BP nanosheets sandwiched between (CsFAMA)Pb(BrI)(3) perovskite and spiro-OMeTAD has a deleterious effect on the performance stabilization of PSCs. To address the above constraints, a feasible strategy herein is developed by introducing high-quality fluorinated BP (F-BP) nanosheets synthesized by one-step electrochemical delamination. In addition to P-Pb coordination, there is a strong hydrogen bond between F- and MA(+)/FA(+) as well as an ionic bond between F- and Pb2+ for the perovskite/F-BP interface, thus leading to fewer interfacial traps than perovskite/BP, which is responsible for the highest power conversion efficiency (22.06%) of F-BP devices. More importantly, F-BP devices exhibit significantly improved humidity and shelf-life stabilities due to the excellent ambient stability of F-BP, resulting from the antioxidation and antihydration behavior of fluorine adatoms. Overall, the findings provide a promising strategy to simultaneously enhance the photovoltaic performance and long-term stability of BP-based PSCs.
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