期刊
ADVANCED ENERGY MATERIALS
卷 10, 期 4, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201903231
关键词
fermi level; ionic liquids; perovskite solar cell; reduced defect density; time-resolved microwave conductivity
类别
资金
- Engineering and Physical Sciences Research Council, UK
- Princeton Center for Complex Materials (PCCM)
- European Commission via a Marie Sklodowska-Curie individual fellowship (REA Grant) [706552-APPEL]
- US Department of Energy
- Director's Fellowship program of the National Renewable Energy Laboratory [DE-AC3608GO28308]
- U.S. Department of Energy (DOE) [DE-AC36-08GO28308]
- Princeton Center for Complex Materials, a National Science Foundation (NSF) Materials Research Science and Engineering Center (MRSEC) [DMR-1420541]
- EPSRC [EP/S004947/1, EP/M024881/1, EP/P006329/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/S004947/1, EP/M024881/1] Funding Source: researchfish
Halide perovskites are currently one of the most heavily researched emerging photovoltaic materials. Despite achieving remarkable power conversion efficiencies, perovskite solar cells have not yet achieved their full potential, with the interfaces between the perovskite and the charge-selective layers being where most recombination losses occur. In this study, a fluorinated ionic liquid (IL) is employed to modify the perovskite/SnO2 interface. Using Kelvin probe and photoelectron spectroscopy measurements, it is shown that depositing the perovskite onto an IL-treated substrate results in the crystallization of a perovskite film which has a more n-type character, evidenced by a decrease of the work function and a shift of the Fermi level toward the conduction band. Photoluminescence spectroscopy and time-resolved microwave conductivity are used to investigate the optoelectronic properties of the perovskite grown on neat and IL-modified surfaces and it is found that the modified substrate yields a perovskite film which exhibits an order of magnitude lower trap density than the control. When incorporated into solar cells, this interface modification results in a reduction in the current-voltage hysteresis and an improvement in device performance, with the best performing devices achieving steady-state PCEs exceeding 20%.
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