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Portrait of Tönu Pullerits; Photo: Kennet Ruona

Tönu Pullerits

Professor

Portrait of Tönu Pullerits; Photo: Kennet Ruona

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

Author

  • Nan Zhu
  • Kaibo Zheng
  • Khadga Jung Karki
  • Mohamed Qenawy
  • Qiushi Zhu
  • Stefan Carlson
  • Dörthe Haase
  • Karel Zidek
  • Jens Ulstrup
  • Sophie Canton
  • Tönu Pullerits
  • Qijin Chi

Summary, in English

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.

Department/s

  • Chemical Physics
  • MAX IV Laboratory
  • NanoLund: Center for Nanoscience

Publishing year

2015

Language

English

Publication/Series

Scientific Reports

Volume

5

Document type

Journal article

Publisher

Nature Publishing Group

Topic

  • Physical Chemistry

Status

Published

ISBN/ISSN/Other

  • ISSN: 2045-2322