Excitonic properties of layer-by-layer CVD grown ZnO hexagonal microdisks

Sikdar, Mrinal K.; Sarangi, Bhabesh; Sahoo, Pratap K.

doi:10.1088/1361-6528/ac1096

Cited by 6 publications

(2 citation statements)

References 60 publications

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“…where hω LO = 72 meV is the LO phonon energy calculated by Reynolds et al [24], and k B is the Boltzmann constant. The E FX can be described by using the Bose-Einstein model as [25,26], in which a B is the exciton-average phonon interaction strength and Θ B is the average phonon temperature, and E FX (0) is the transition energy of free exciton at 0 K. The parameters of E Fx (0) = 3.380 ± 0.0004 eV, a B = 0.030 ± 0.016 eV and Θ B = 307.27 ± 74.57 K have been obtained from the fitting.…”

Section: Resultsmentioning

confidence: 99%

Recombination dynamics and pronounced re-absorption effect in ZnO single crystals under two-photon excitation

Lu,

Zhao,

Zheng

et al. 2023

J. Phys. D: Appl. Phys.

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Time-resolved photoluminescence measurements were conducted on ZnO single crystals using two-photon (2P) excitation at low temperatures ranging from 25 to 260 K. The decay constants of various emission peaks are determined and compared between one-photon and two-photon excitations using a recently modified localized-state ensemble model. The analysis is focused on the redshift of the phonon-assisted free exciton transition energy with increasing temperature. A significantly longer radiative recombination lifetime of approximately 840 ps is observed under 2P excitation. The extended lifetime of excitons during 2P excitation is achieved through the interplay of multiple mechanisms. Photon-recycling, enabled by high absorption coefficients and total internal reflection, facilitates re-absorption and new carrier generation. Phonon scattering lowers photon energy, allowing their escape from the crystal, while exciton–polariton interactions delay photon travel, collectively contributing to the extension of exciton lifetimes. The re-absorption effect and elongated carrier lifetime observed from our work could be beneficial for applications of ZnO materials in 2P imaging, particularly of biological samples.

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Section: Resultsmentioning

confidence: 99%

Recombination dynamics and pronounced re-absorption effect in ZnO single crystals under two-photon excitation

Lu,

Zhao,

Zheng

et al. 2023

J. Phys. D: Appl. Phys.

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show abstract

“…ZnO is a promising semiconductor for photonic, electronic, optoelectronic and spintronic applications. [1][2][3][4][5][6][7][8][9][10] It is a transparent conducting oxide (TCO) having a direct wide bandgap (3.37 eV) and a high exciton binding energy (60 meV) at room temperature. ZnO thin films and nanorods are also stable under ambient conditions.…”

Section: Introductionmentioning

confidence: 99%