Negative Thermal Quenching in FASnI(3) Perovskite Single Crystals and Thin Films

Kahmann, S., Nazarenko, O., Shao, S., Hordiichuk, O., Kepenekian, M., Even, J., Kovalenko, M., Blake, G. R. & Loi, M. A., 14-Aug-2020, In : ACS Energy Letters. 5, 8, p. 2512-2519 8 p.

Research output: Contribution to journalArticleAcademicpeer-review

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.

Original languageEnglish
Pages (from-to)2512-2519
Number of pages8
JournalACS Energy Letters
Issue number8
Publication statusPublished - 14-Aug-2020



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