Journal
ACS ENERGY LETTERS
Volume 5, Issue 8, Pages 2512-2519Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.0c01166
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Funding
- Deutsche Forschungsgemeinschaft (DFG) [408012143]
- Materials for Sustainability (Mat4Sus) programme of The Netherlands Organisation for Scientific Research (NWO) [739.017.005]
- Institut Universitaire de France
- European Union's Horizon 2020 research and innovation Programme [862656]
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Formamidinium tin triiodide (FASnI(3)) is a strong contender for sustainable harvesting of solar energy and further optoelectronic applications. So far, only a few studies have considered its fundamental structure-property relationships, given the challenge of ensuring a high material quality. In a concerted effort, we here study high-quality FASnI(3) single crystals through a combination of X-ray crystallography, density-functional-theory-based electronic structure calculations, and photoluminescence spectroscopy from room temperature down to 4 K. The luminescence exhibits irregular trends upon cooling with a generally strong intensity increase, but a range of negative thermal quenching, leading to an intensity maximum around 185 K which is absent in low-quality samples. Differences in the photoluminescence peak position and density-functional-theory-calculated band-gap energies highlight the importance of dynamic processes to the observable properties of FASnI(3). The presented data offer deeper insight into the temperature-dependent characteristics of this halide perovskite and present opportunities for future exploration of its optoelectronic properties.
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