2021
DOI: 10.1063/5.0066176
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Dynamics of exciton–polariton emission in CuI

Abstract: 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 Z1,2 excitons in CuI. For free exciton–polaritons, an increase in the decay time with increasing temperature up to 360 … Show more

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Cited by 10 publications
(18 citation statements)
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“…In the case of CuI, the calculated quasi-particle gap of 3.07 eV (see Fig. 3 (a)) matches the experimental value under consideration of the exciton binding energy of 62 meV for CuI 25 excellently well. For CuBr, the calculated quasi-particle gap is approximately 2.7 eV (see Fig.…”
Section: A Dielectric Function Of Cubrxi1-xsupporting
confidence: 76%
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“…In the case of CuI, the calculated quasi-particle gap of 3.07 eV (see Fig. 3 (a)) matches the experimental value under consideration of the exciton binding energy of 62 meV for CuI 25 excellently well. For CuBr, the calculated quasi-particle gap is approximately 2.7 eV (see Fig.…”
Section: A Dielectric Function Of Cubrxi1-xsupporting
confidence: 76%
“…A full discussion of the influence of the ordered configurations together with other effects one needs to consider is given in the supplementary material. Furthermore, we note that due to the high exciton binding energy of 62 meV for CuI 25 and 108 meV for CuBr 68 , the optical transitions exhibit a strong excitonic character even at room temperature. Thus, since the exciton binding energy is expected to depend on the alloy composition, it is not immediately obvious that the theoretically computed bowing of the bandgap must match the experimentally observed bowing of the E 0 transition.…”
Section: B Bandgap Bowingmentioning
confidence: 81%
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“…In the search for suitable transparent p ‐type semiconductors, copper iodide (CuI) in particular has become the focus of current research. With its large bandgap of 3.1 eV, [ 1,2 ] high exciton binding energy of 62 meV , [ 2,3 ] and high hole mobility up to 43 cm 2 Vs 1 [ 4 ] , CuI is ideally suited for future applications in transparent transistors, [ 5,6 ] solar cells, [ 7,8 ] and photodetectors. [ 9 ] Recently, various approaches have also been discussed to modify the electrical and optical properties of CuI using alloys, such as CuBr x normalI 1 x [ 10–12 ] Ag x Cu 1 x I .…”
Section: Introductionmentioning
confidence: 99%