Temperature-dependent decay dynamics in highly mismatched ZnSe 1-xTe x alloy

Yan Cheng Lin, Wei Shi Jiang, Wu Ching Chou, Wei Kuo Chen, Wen Hao Chang, Chin Hau Chia, Cheng Yu Chen, Jen Inn Chyi

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3 Scopus citations

Abstract

This study investigates the temperature-dependent decay dynamics in highly mismatched ZnSe 0.950Te 0.050 alloy using photoluminescence (PL) and time-resolved PL spectroscopy. The PL peak energy exhibits a V-shaped dependence on temperature (10-300 K), indicating strong carrier localization. Kohlrausch's stretched exponential law, in which the deduced stretching exponent is highly consistent with the V-shaped PL peak shift, closely corresponds to the complex decay curves over a wide temperature range. Additionally, the PL lifetime initially increases and then monotonically declines as the temperature increases. These findings agree excellently with the low electron-hole binding energy upon thermal ionization of weakly bound electrons.

Original languageEnglish
Article number071912
JournalApplied Physics Letters
Volume100
Issue number7
DOIs
StatePublished - 13 Feb 2012

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