期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 7, 期 7, 页码 1321-1326出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.6b00322
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资金
- Engineering and Physical Sciences Research Council (EPSRC)
- EPSRC Centre for Doctoral Training in New and Sustainable Photovoltaics (CDT-PV)
- Marie Curie Intra European Fellowship (MESO-SUPER-CELLS) within the 7th European Community Framework Programme [PIEG-GA-2012-327015]
- Engineering and Physical Sciences Research Council [EP/L024667/1, EP/G049653/1, 1511770] Funding Source: researchfish
- EPSRC [EP/L024667/1, EP/G049653/1] Funding Source: UKRI
Methylammonium tin triiodide (MASnI(3)) has been successfully employed in lead-free perovskite solar cells, but overall power-conversion efficiencies are still significantly lower than for lead-based perovskites. Here we present photoluminescence (PL) spectra and time resolved PL from 8 to 295 K and find a marked improvement in carrier lifetime and a substantial reduction in PL line width below similar to 110 K, indicating that the cause of the hindered performance is activated at the orthorhombic to tetragonal phase transition. Our measurements therefore suggest that targeted structural change may be capable of tailoring the relative energy level alignment of defects (e.g., tin vacancies) to reduce the background dopant density and improve charge extraction. In addition, we observe for the first time an above-gap emission feature that may arise from higher-lying interband transitions, raising the prospect of excess energy harvesting.
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