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Sandwiched confinement of quantum dots in graphene matrix for efficient electron transfer and photocurrent production.

Zhu, Nan; Zheng, Kaibo LU ; Karki, Khadga Jung LU ; Qenawy, Mohamed LU ; Zhu, Qiushi LU ; Carlson, Stefan LU ; Haase, Dörthe LU ; Zidek, Karel LU ; Ulstrup, Jens and Canton, Sophie LU , et al. (2015) In Scientific Reports 5.
Abstract
Quantum dots (QDs) and graphene are both promising materials for the development of new-generation optoelectronic devices. Towards this end, synergic assembly of these two building blocks is a key step but remains a challenge. Here, we show a one-step strategy for organizing QDs in a graphene matrix via interfacial self-assembly, leading to the formation of sandwiched hybrid QD-graphene nanofilms. We have explored structural features, electron transfer kinetics and photocurrent generation capacity of such hybrid nanofilms using a wide variety of advanced techniques. Graphene nanosheets interlink QDs and significantly improve electronic coupling, resulting in fast electron transfer from photoexcited QDs to graphene with a rate constant of... (More)
Quantum dots (QDs) and graphene are both promising materials for the development of new-generation optoelectronic devices. Towards this end, synergic assembly of these two building blocks is a key step but remains a challenge. Here, we show a one-step strategy for organizing QDs in a graphene matrix via interfacial self-assembly, leading to the formation of sandwiched hybrid QD-graphene nanofilms. We have explored structural features, electron transfer kinetics and photocurrent generation capacity of such hybrid nanofilms using a wide variety of advanced techniques. Graphene nanosheets interlink QDs and significantly improve electronic coupling, resulting in fast electron transfer from photoexcited QDs to graphene with a rate constant of 1.3 × 10(9) s(-1). Efficient electron transfer dramatically enhances photocurrent generation in a liquid-junction QD-sensitized solar cell where the hybrid nanofilm acts as a photoanode. We thereby demonstrate a cost-effective method to construct large-area QD-graphene hybrid nanofilms with straightforward scale-up potential for optoelectronic applications. (Less)
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type
Contribution to journal
publication status
published
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in
Scientific Reports
volume
5
publisher
Nature Publishing Group
external identifiers
  • pmid:25996307
  • wos:000355502100001
  • scopus:84930226749
ISSN
2045-2322
DOI
10.1038/srep09860
language
English
LU publication?
yes
id
e66a35b3-1fc2-4db1-9a21-6089c1f05206 (old id 5442718)
date added to LUP
2015-06-23 17:09:13
date last changed
2017-02-12 03:42:29
@article{e66a35b3-1fc2-4db1-9a21-6089c1f05206,
  abstract     = {Quantum dots (QDs) and graphene are both promising materials for the development of new-generation optoelectronic devices. Towards this end, synergic assembly of these two building blocks is a key step but remains a challenge. Here, we show a one-step strategy for organizing QDs in a graphene matrix via interfacial self-assembly, leading to the formation of sandwiched hybrid QD-graphene nanofilms. We have explored structural features, electron transfer kinetics and photocurrent generation capacity of such hybrid nanofilms using a wide variety of advanced techniques. Graphene nanosheets interlink QDs and significantly improve electronic coupling, resulting in fast electron transfer from photoexcited QDs to graphene with a rate constant of 1.3 × 10(9) s(-1). Efficient electron transfer dramatically enhances photocurrent generation in a liquid-junction QD-sensitized solar cell where the hybrid nanofilm acts as a photoanode. We thereby demonstrate a cost-effective method to construct large-area QD-graphene hybrid nanofilms with straightforward scale-up potential for optoelectronic applications.},
  articleno    = {09860},
  author       = {Zhu, Nan and Zheng, Kaibo and Karki, Khadga Jung and Qenawy, Mohamed and Zhu, Qiushi and Carlson, Stefan and Haase, Dörthe and Zidek, Karel and Ulstrup, Jens and Canton, Sophie and Pullerits, Tönu and Chi, Qijin},
  issn         = {2045-2322},
  language     = {eng},
  publisher    = {Nature Publishing Group},
  series       = {Scientific Reports},
  title        = {Sandwiched confinement of quantum dots in graphene matrix for efficient electron transfer and photocurrent production.},
  url          = {http://dx.doi.org/10.1038/srep09860},
  volume       = {5},
  year         = {2015},
}