期刊
ACS ENERGY LETTERS
卷 5, 期 7, 页码 2200-2207出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.0c01020
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资金
- EPSRC [EP/M015254/2, EP/S516119/1, EP/M005143/1, EP/P032591/1]
- H2020 through the European Union's Horizon 2020 research and innovation programme through PERTPV project [763977]
- H2020 through the European Union's Horizon 2020 research and innovation programme through CHEOPS project [730135]
- Rhodes Trust (India)
- Rhodes Trust (Worcester)
- Centre for Doctoral Training in New and Sustainable Photovoltaics
- Oxford-Radcliffe Scholarship
- TIFR Hyderabad from the Department of Atomic Energy (DAE), India
- Cambridge Materials Limited
- Wolfson College
- University of Cambridge
- EPSRC [EP/M005143/1, EP/M015254/2, EP/P032591/1] Funding Source: UKRI
Double perovskites have recently emerged as possible alternatives to lead-based halide perovskites for photovoltaic applications. In particular, Cs2AgBiBr6 has been the subject of several studies because of its environmental stability, low toxicity, and its promising optoelectronic features. Despite these encouraging features, the performances of solar cells based on this double perovskite are still low, suggesting severe limitations that need to be addressed. In this work we combine experimental and theoretical studies to show that the short electron diffusion length is one of the major causes for the limited performance of Cs2AgBiBr6 solar cells. Using EQE measurements on semitransparent Cs2AgBiBr6 solar cells we estimate the electron diffusion length to be only 30 nm and corroborated this value by terahertz spectroscopy. By using photothermal deflection spectroscopy and surface photovoltage measurements we correlate the limited electron diffusion length with a high density of electron traps. Our findings highlight important faults affecting this double perovskite, showing the challenges to overcome and hinting to a possible path to improve the efficiency of Cs2AgBiBr6 solar cells.
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