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

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

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskriftPeer review

Sammanfattning

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.
Originalspråkengelska
Artikelnummer09860
TidskriftScientific Reports
Volym5
DOI
StatusPublished - 2015

Bibliografisk information

The information about affiliations in this record was updated in December 2015.
The record was previously connected to the following departments: Max-laboratory (011012005), Chemical Physics (S) (011001060)

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  • Fysikalisk kemi

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