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

Zhu, N., Zheng, K., Karki, K. J., Abdellah, M., Zhu, Q., Carlson, S., et al. (2015). Sandwiched confinement of quantum dots in graphene matrix for efficient electron transfer and photocurrent production. Scientific Reports, 5: 9860. doi:10.1038/srep09860.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-60AA-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-60B1-7
Genre: Journal Article

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 Creators:
Zhu, N., Author
Zheng, K., Author
Karki, K. J., Author
Abdellah, M., Author
Zhu, Q., Author
Carlson, S., Author
Haase, D., Author
Zídek, K., Author
Ulstrup, J., Author
Canton, S. E.1, Author              
Pullerits, T., Author
Chi, Q., Author
Affiliations:
1Research Group of Structural Dynamics of (Bio)Chemical Systems, MPI for Biophysical Chemistry, Max Planck Society, ou_578564              

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 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 × 109 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.

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Language(s): eng - English
 Dates: 2015-05-21
 Publication Status: Published online
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1038/srep09860
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Title: Scientific Reports
Source Genre: Journal
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Pages: 14 Volume / Issue: 5 Sequence Number: 9860 Start / End Page: - Identifier: -