Journal
APL MATERIALS
Volume 9, Issue 12, Pages -Publisher
AIP Publishing
DOI: 10.1063/5.0066176
Keywords
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Funding
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [FOR 2857, 403159832]
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The temperature-dependent spectral and dynamical properties of free exciton-polariton and bound exciton emission in copper iodide bulk single crystals were analyzed, revealing different decay times and localization energy dependencies. The observation of characteristic line shapes and defect densities provides insights into the behavior of excitons in CuI crystals over a wide temperature range.
We report on temperature-dependent (10 K - 250 K) spectral and dynamical properties of free exciton-polariton and bound exciton emission in copper iodide (CuI) bulk single crystals analyzed by means of time-resolved photoluminescence spectroscopy. The characteristic line shape of the polariton emission at low temperatures is interpreted in terms of the k-linear term effect on the degenerate Z(1,2) excitons in CuI. For free exciton-polaritons, an increase in the decay time with increasing temperature up to 360 ps at 160 K is observed. For bound exciton emission, decay times between 180 ps and 380 ps are observed at low temperatures, revealing the expected EB3/2 dependence of radiative lifetime on the localization energy. Based on the observed rise times of bound excitons at low temperatures, a defect density of shallow acceptors of 1 x 10(17) cm(-3) was estimated, in agreement with measured room temperature free hole density. (c) 2021 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). https://doi.org/10.1063/5.0066176
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