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Electron relaxation in the CdSe quantum dot - ZnO composite: prospects for photovoltaic applications.

Zidek, Karel LU ; Qenawy, Mohamed LU ; Zheng, Kaibo LU and Pullerits, Tönu LU (2014) In Scientific Reports 4.
Abstract
Quantum dot (QD)-metal oxide composite forms a "heart" of the QD-sensitized solar cells. It maintains light absorption and electron-hole separation in the system and has been therefore extensively studied. The interest is largely driven by a vision of harvesting the hot carrier energy before it is lost via relaxation. Despite of importance of the process, very little is known about the carrier relaxation in the QD-metal oxide composites. In order to fill this gap of knowledge we carry out a systematic study of initial electron dynamics in different CdSe QD systems. Our data reveal that QD attachment to ZnO induces a speeding-up of transient absorption onset. Detailed analysis of the onset proves that the changes are caused by an additional... (More)
Quantum dot (QD)-metal oxide composite forms a "heart" of the QD-sensitized solar cells. It maintains light absorption and electron-hole separation in the system and has been therefore extensively studied. The interest is largely driven by a vision of harvesting the hot carrier energy before it is lost via relaxation. Despite of importance of the process, very little is known about the carrier relaxation in the QD-metal oxide composites. In order to fill this gap of knowledge we carry out a systematic study of initial electron dynamics in different CdSe QD systems. Our data reveal that QD attachment to ZnO induces a speeding-up of transient absorption onset. Detailed analysis of the onset proves that the changes are caused by an additional relaxation channel dependent on the identity of the QD-ZnO linker molecule. The faster relaxation represents an important factor for hot carrier energy harvesting, whose efficiency can be influenced by almost 50%. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Scientific Reports
volume
4
publisher
Nature Publishing Group
external identifiers
  • pmid:25430684
  • wos:000346255000002
  • scopus:84922610589
ISSN
2045-2322
DOI
10.1038/srep07244
language
English
LU publication?
yes
id
521672df-9f8f-470a-a015-df7d51597ad1 (old id 4815843)
date added to LUP
2014-12-12 15:03:06
date last changed
2017-10-01 04:03:13
@article{521672df-9f8f-470a-a015-df7d51597ad1,
  abstract     = {Quantum dot (QD)-metal oxide composite forms a "heart" of the QD-sensitized solar cells. It maintains light absorption and electron-hole separation in the system and has been therefore extensively studied. The interest is largely driven by a vision of harvesting the hot carrier energy before it is lost via relaxation. Despite of importance of the process, very little is known about the carrier relaxation in the QD-metal oxide composites. In order to fill this gap of knowledge we carry out a systematic study of initial electron dynamics in different CdSe QD systems. Our data reveal that QD attachment to ZnO induces a speeding-up of transient absorption onset. Detailed analysis of the onset proves that the changes are caused by an additional relaxation channel dependent on the identity of the QD-ZnO linker molecule. The faster relaxation represents an important factor for hot carrier energy harvesting, whose efficiency can be influenced by almost 50%.},
  articleno    = {7244},
  author       = {Zidek, Karel and Qenawy, Mohamed and Zheng, Kaibo and Pullerits, Tönu},
  issn         = {2045-2322},
  language     = {eng},
  publisher    = {Nature Publishing Group},
  series       = {Scientific Reports},
  title        = {Electron relaxation in the CdSe quantum dot - ZnO composite: prospects for photovoltaic applications.},
  url          = {http://dx.doi.org/10.1038/srep07244},
  volume       = {4},
  year         = {2014},
}