Abstract:
:The influence of the growth conditions of multilayer CdTe/ZnTe quantum dots (QDs) on Si substrate upon their carrier dynamics is studied using intensity integration and broadening photoluminescence. The unusual temperature dependence of the line broadening is explained using a model for interband transitions that involves a lowest discrete electronic state (1Se) with different discrete hole states (1S3/2 and 2S3/2) and a 1P transition. These transitions are expected to play a critical role in both the thermally activated energy and the line broadening of the QDs. We also demonstrate that a thermally activated transition between two different states occurs with band low-temperature quenching, with values separated by 5.8-16 meV. The main nonradiative process is thermal escape assisted by carrier scattering via emission of longitudinal phonons through the hole states at high temperature, with an average energy of 19.3-20.2 meV.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Man MT,Lee HSdoi
10.1038/srep08267subject
Has Abstractpub_date
2015-02-05 00:00:00pages
8267issn
2045-2322pii
srep08267journal_volume
5pub_type
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