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

Simon Kahmann, Olga Nazarenko, Shuyan Shao, Oleh Hordiichuk, Mikael Kepenekian, Jacky Even, Maksym Kovalenko, Graeme R. Blake*, Maria A. Loi*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

6 Citations (Scopus)
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Abstract

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
Volume5
Issue number8
DOIs
Publication statusPublished - 14-Aug-2020

Keywords

  • FORMAMIDINIUM TIN IODIDE
  • ORGANIC CATIONS
  • SOLAR-CELLS

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