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Relaxation of Multiple Excitons in ZnCdS and ZnCdS/ZnS Alloy Quantum Dotsстатья
- Авторы: Vasin A.A., Dobryakov A.L., Kochev S.Yu, Antonova O.Yu, Gostev F.E., Shelayev I.V., Kostrov A.N., Aibush A.V., Nadtochenko V.A.
- Журнал: Russian Journal of Physical Chemistry B
- Том: 18
- Номер: 6
- Год издания: 2024
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 1646
- Последняя страница: 1650
- DOI: 10.1134/s1990793124701380
- Аннотация: The relaxation dynamics of "hot" and band-edge excitons in ZnCdS (2.8 eV edge exciton) and ZnCdS/ZnS (2.7 eV) quantum dot alloys was studied using femtosecond pump (360 nm, 3.44 eV, 25 fs)-probe (380-700 nm) laser spectroscopy. Transients were studied as a function of the pump pulse energy, which changes the number of excitons. The relaxation of the "hot" exciton is controlled by the Auger mechanism. The decay time of a "hot" exciton depends very weakly on the pump energy and is in the range of 140-190 fs. The decay of a band-edge exciton depends significantly on the pump energy, which suggests an Auger recombination mechanism. The multiexponential transient decay is well described within the stochastic model with only two constants and k(i)(Auger) and k(i)(1) = i/tau(1)
- Добавил в систему: Антонова Ольга Юрьевна