Exotic optoelectronic behaviors in CH3NH3PbCl3perovskite single crystals: Co-existence of free and bound excitons with structural phase transitions

Hye Ri Jung, Maryam Bari, Yunae Cho, Yeon Soo Kim, Trang Thi Thu Nguyen, Yejin Kim, Seokhyun Yoon, Young Chan Jo, Jae Hoon Kim, Shavkat Yuldashev, Zuo Guang Ye, William Jo

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

CH3NH3PbCl3 (MAPbCl3) perovskite single crystal is attractive for the ultra-violet detector due to its wide bandgap and comparative stability over iodine or bromine systems. Single crystals of MAPbCl3 perovskite are also intriguing owing to its generic type of materials for fundamental photophysical properties and excitonic behaviors for its use in devices. Furthermore, recent progress using crystal-based device fabrication will shed light on semiconducting devices like III-V compounds. In this study, a structurally well-defined crystal is grown and examined to reveal free and bound excitonic behaviors depending on the structural phase transition. We classified the free and bound excitonic behaviors by temperature- and power density-dependent photoluminescence and optical transmission spectra. The single emission peak located at 3.1 eV and blueshift depending on decreasing the temperature is attributed to the radiative recombination of the free exciton at the cubic and the tetragonal phases, whereas the several peaks from the bound excitonic transition are just revealed under 120 K of the orthorhombic phase. We also determined the work function distribution and band structures with excitonic bound states via Kelvin probe force microscopy. The optoelectronic properties resulted in the excitonic behaviors can be a fundamental approach for the construction of perovskite-based optoelectronic and photonic applications.

Original languageEnglish
Article number143301
JournalApplied Physics Letters
Volume118
Issue number14
DOIs
StatePublished - 5 Apr 2021

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