Carrier generation and recombination dynamics in type-II ZnSeTe/ZnMnSe quantum structures

Yan Cheng Lin, Wu-Ching Chou

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Type-II band alignment structure is coveted in the design of photovoltaic devices, since it is beneficial for the transport of photogenerated carriers. Here we study the generation and recombination dynamics of carriers in a type-II quantum structure composed of ZnSe0.92Te0.08 highly mismatched alloys (HMAs) and Zn0.97Mn0.03Se. The photoinduced holes at the ZnSe0.92Te0.08 HMAs firstly undergo rapid relaxation to the isoelectronic centers above the valence band edge and subsequently recombine with the free electrons in the Zn0.97Mn0.03Se. The long carrier lifetimes over 120 ns induced by spatially indirect excitons that are bound to isoelectronic Te trapping states further increase with increasing temperature.

Original languageEnglish
Article number305704
JournalNanotechnology
Volume26
Issue number30
DOIs
StatePublished - 31 Jul 2015

Keywords

  • carrier dynamics
  • long carrier lifetime
  • quantum structure
  • type-II band alignment
  • ZnSeTe

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