Evidence for photogenerated intermediate hole polarons in ZnO

H. Sezen, H. Shang, F. Bebensee, Chengwu Yang, M. Buchholz, A. Nefedov, S. Heissler, C. Carbogno, M. Scheffler, P. Rinke, C. Wöll

Research output: Contribution to journalArticleScientificpeer-review

32 Citations (Scopus)
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Abstract

Despite their pronounced importance for oxide-based photochemistry, optoelectronics and photovoltaics, only fairly little is known about the polaron lifetimes and binding energies. Polarons represent a crucial intermediate step populated immediately after dissociation of the excitons formed in the primary photoabsorption process. Here we present a novel approach to studying photoexcited polarons in an important photoactive oxide, ZnO, using infrared (IR) reflection–absorption spectroscopy (IRRAS) with a time resolution of 100 ms. For well-defined (10-10) oriented ZnO single-crystal substrates, we observe intense IR absorption bands at around 200 meV exhibiting a pronounced temperature dependence. On the basis of first-principles-based electronic structure calculations, we assign these features to hole polarons of intermediate coupling strength.
Original languageEnglish
Article number6901
Pages (from-to)1-4
JournalNature Communications
Volume6
DOIs
Publication statusPublished - 2015
MoE publication typeA1 Journal article-refereed

Keywords

  • first principles
  • infrared spectroscopy
  • polarons
  • ZnO

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