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.
%0 Journal Article
%1 sezen2015evidence
%A Sezen, Hikmet
%A Shang, Honghui
%A Bebensee, Fabian
%A Yang, Chengwu
%A Buchholz, Maria
%A Nefedov, Alexei
%A Heissler, Stefan
%A Carbogno, Christian
%A Scheffler, Matthias
%A Rinke, Patrick
%A others,
%D 2015
%I Nature Publishing Group
%J Nature communications
%K ZnO polarons theory
%P 6901
%T Evidence for photogenerated intermediate hole polarons in ZnO
%V 6
%X 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.
@article{sezen2015evidence,
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.},
added-at = {2019-07-12T20:54:06.000+0200},
author = {Sezen, Hikmet and Shang, Honghui and Bebensee, Fabian and Yang, Chengwu and Buchholz, Maria and Nefedov, Alexei and Heissler, Stefan and Carbogno, Christian and Scheffler, Matthias and Rinke, Patrick and others},
biburl = {https://www.bibsonomy.org/bibtex/28f5d883bb626492a5ecf976e37e1a503/skoerbel},
interhash = {b4f2513a164742bdb5bbf38cf14d6047},
intrahash = {8f5d883bb626492a5ecf976e37e1a503},
journal = {Nature communications},
keywords = {ZnO polarons theory},
pages = 6901,
publisher = {Nature Publishing Group},
timestamp = {2019-07-12T20:54:06.000+0200},
title = {Evidence for photogenerated intermediate hole polarons in ZnO},
volume = 6,
year = 2015
}