Evidence for photogenerated intermediate hole polarons in ZnO

@article{Sezen2015,
 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.},
 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 Wöll, Christof},
 doi = {10.1038/ncomms7901},
 file = {:C$\backslash$:/Users/shanghui/AppData/Local/Mendeley Ltd./Mendeley Desktop/Downloaded/Sezen et al. - 2015 - Evidence for photogenerated intermediate hole polarons in ZnO(2).pdf:pdf},
 issn = {2041-1723},
 journal = {Nature Communications},
 month = {dec},
 number = {1},
 pages = {6901},
 pmid = {25902307},
 title = {Evidence for photogenerated intermediate hole polarons in ZnO},
 url = {http://www.nature.com/articles/ncomms7901},
 volume = {6},
 year = {2015}
}