Electron relaxation in the CdSe quantum dot - ZnO composite: prospects for photovoltaic applications.
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/4815843
- author
- Zidek, Karel LU ; Qenawy, Mohamed LU ; Zheng, Kaibo LU and Pullerits, Tönu LU
- organization
- publishing date
- 2014
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Scientific Reports
- volume
- 4
- article number
- 7244
- publisher
- Nature Publishing Group
- external identifiers
-
- pmid:25430684
- wos:000346255000002
- scopus:84922610589
- pmid:25430684
- ISSN
- 2045-2322
- DOI
- 10.1038/srep07244
- language
- English
- LU publication?
- yes
- additional info
- The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Chemical Physics (S) (011001060)
- id
- 521672df-9f8f-470a-a015-df7d51597ad1 (old id 4815843)
- date added to LUP
- 2016-04-01 13:06:22
- date last changed
- 2023-09-30 21:02:19
@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%.}},
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}},
doi = {{10.1038/srep07244}},
volume = {{4}},
year = {{2014}},
}