CdSe Quantum Dot-Fullerene Hybrid Nanocomposite for Solar Energy Conversion: Electron Transfer and Photoelectrochemistry
- Authors
- Bang, Jin Ho; Kamat, Prashant V.
- Issue Date
- Dec-2011
- Publisher
- American Chemical Society
- Keywords
- solar cell; quantum dots; fullerene; electron transfer; photoelectrochemistry
- Citation
- ACS Nano, v.5, no.12, pp.9421 - 9427
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS Nano
- Volume
- 5
- Number
- 12
- Start Page
- 9421
- End Page
- 9427
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/36378
- DOI
- 10.1021/nn204350w
- ISSN
- 1936-0851
- Abstract
- The development of organic/inorganic hybrid nanocomposite systems that enable efficient solar energy conversion has been important for applications in solar cell research. Nanostructured carbon-based systems, in particular C-60, offer attractive strategies to collect and transport electrons generated in a light harvesting assembly. We have assembled CdSe-C-60 nanocomposites by chemically linking CdSe quantum dots (QDs) with thiol-functionalized C-60. The photoinduced charge separation and collection of electrons in CdSe QD-C-60 nanocomposites have been evaluated using transient absorption spectroscopy and photoelectrochemical measurements. The rate constant for electron transfer between excited CdSe QD and C-60 increased with the decreasing size of the CdSe QD (7.9 x 10(9) s(-1) (4.5 nm), 1.7 x 10(10) s(-1) (3.2 nm), and 9.0 x 10(10) s(-1) (2.6 nm)). Slower hole transfer and faster charge recombination and transport events were found to dominate over the forward electron injection process, thus limiting the deliverance of maximum power in CdSe QD-C-60-based solar cells. The photoinduced charge separation between CdSe QDs and C-60 opens up new design strategies for developing light harvesting assemblies.
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