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Optical Characterization of CdSe Colloidal Quantum Dot/ MEH-PPV Polymer Nanocomposites Spin-cast on GaAs Substrates

Published online by Cambridge University Press:  01 February 2011

Adrienne D. Stiff-Roberts
Affiliation:
adrienne.stiffroberts@duke.edu, Duke University, Electrical and Computer Engineering, Box 90291, Durham, NC, 27708-0291, United States
Abhishek Gupta
Affiliation:
agupta@ee.duke.edu, Duke University, Electrical and Computer Engineering, Box 90291, Durham, NC, 27708-0291, United States
Zhiya Zhao
Affiliation:
zz9@ee.duke.edu, Duke University, Electrical and Computer Engineering, Box 90291, Durham, NC, 27708-0291, United States
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Abstract

The motivation and distinct approach for this work is the use of intraband transitions within colloidal quantum dots for the detection of mid- (3-5 μm) and/or long-wave (8-14 μm) infrared light. The CdSe colloidal quantum dot/MEH-PPV conducting polymer nanocomposite material is well-suited for this application due to the ∼1.5 eV difference between the corresponding electron affinities. Therefore, CdSe colloidal quantum dots embedded in MEH-PPV should provide electron quantum confinement such that intraband transitions can occur in the conduction band. Further, it is desirable to deposit these nanocomposites on semiconductor substrates to enable charge transfer of photogenerated electron-hole pairs from the substrate to the nanocomposite. In this way, optoelectronic devices analogous to those achieved using Stranski-Krastanow quantum dots grown by epitaxy can be realized. To date, there have been relatively few investigations of colloidal quantum dot nanocomposites deposited on GaAs substrates. However, it is crucial to develop a better understanding of the optical properties of these hybrid material systems if such heterostructures are to be used for optoelectronic devices, such as infrared photodetectors. By depositing the nanocomposites on GaAs substrates featuring different doping characteristics and measuring the corresponding Fourier transform infrared absorbance, the feasibility of these intraband transitions is demonstrated at room temperature.

Type
Research Article
Copyright
Copyright © Materials Research Society 2006

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References

1 Bhattacharya, P., Ghosh, S., and Stiff-Roberts, A. D., Annual Review of Materials Research 34, 1 (2004).Google Scholar
2 Stiff-Roberts, A. D., Chakrabarti, S., Su, X. et al., Laser Focus World 41, 103 (2005).Google Scholar
3 Binks, D. J., IEEE Journal of Quantum Electronics 40 (8), 1140 (2004).Google Scholar
4 Stiff-Roberts, A. D., Zhang, W., Peng, H. et al., presented at the 47th Annual TMS Electronic Materials Conference, Santa Barbara, CA, 2005.Google Scholar
5 Bakueva, L., Musikhin, S., Hines, M. A. et al., Applied Physics Letters 82 (17), 2895 (2003).Google Scholar
6 Tessler, N., Medvedev, V., Kazes, M. et al., Science 295, 1506 (2002).Google Scholar
7 Leatherdale, C. A., Kagan, C. R., Morgan, N. Y. et al., Physical Review B 62 (4), 2669 (2000).Google Scholar
8 Guyot-Sionnest, P. and Hines, M. A., Applied Physics Letters 72, 686 (1998).Google Scholar
9 Ginger, D. S., Dhoot, A. S., Finlayson, C. E. et al., Applied Physics Letters 77, 2816 (2000).Google Scholar
10 Vasilevskiy, M. I., Rolo, A. G., Artemyev, M. V. et al., Physica Status Solidi B 224, 599 (2001).Google Scholar
11 McDonald, S. A., Cyr, P. W., L. Levina et al., Applied Physics Letters 85 (11), 2089 (2004).Google Scholar
12 Menendez-Proupin, E. and Trallero-Giner, C., Physical Review B 69, 125336 (2004).Google Scholar
13 Campbell, I. H., Hagler, T. W., Smith, D. L. et al., Physical Review Letters 76 (11), 1900 (1996).Google Scholar
14 Greenham, N. C., Peng, X., and Alivisatos, A. P., Physical Review B 54 (24), 17628 (1996).Google Scholar