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.; Haase, D.; Zídek, K.; Ulstrup, J.; Canton, S. E.; Pullerits, T.; Chi, Q.

doi:10.1038/srep09860

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学術論文

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

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Canton, S. E.
Research Group of Structural Dynamics of (Bio)Chemical Systems, MPI for Biophysical Chemistry, Max Planck Society;

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2395180.pdf
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2395180_Suppl.pdf
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引用

Zhu, N., Zheng, K., Karki, K. J., Abdellah, M., Zhu, Q., Carlson, S., Haase, D., Zídek, K., Ulstrup, J., Canton, S. E., Pullerits, T., & Chi, Q. (2015). Sandwiched confinement of quantum dots in graphene matrix for efficient electron transfer and photocurrent production. Scientific Reports, 5:. doi:10.1038/srep09860.

引用: https://hdl.handle.net/11858/00-001M-0000-002C-60AA-A

要旨

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.