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Transport properties of annealed CdSe colloidal nanocrystal solids
Open accessAbstract
Transport properties of artificial solids composed of colloidal CdSe nanocrystals (NCs) are studied from 6 to 250 K, before and after annealing. After the solids are annealed, three changes are observed. First, transmission electron micrographs show that the separation between NCs decreases with annealing. Second, the optical absorption spectrum changes: the excitonic peaks of the NC solids shift to lower energies and broaden with annealing. These redshifts can result from the change of the dielectric environment around the NCs. Last, annealing results in greatly enhanced dark current and photocurrent. This increased current can be attributed to the enhancement of interdot tunneling caused by the decreased separation between NCs and by chemical changes in their organic cap. In addition, the dark current is an exponential function of the applied electric field and it is only weakly temperature dependent. Our measurements also suggest that Coulomb interactions between charges on neighboring NCs play an important role in the tunneling current.
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Cited by
Size-Dependent Valence and Conduction Band-Edge Energies of Semiconductor Nanocrystals
Jasieniak, J., Califano, M., & Watkins, S. E. (2011) · ACS Nano · doi:10.1021/nn201681s · Cited by 699
n -Type Conducting CdSe Nanocrystal Solids
Yu, D., Wang, C., & Guyot-Sionnest, P. (2003) · Science · doi:10.1126/science.1084424 · Cited by 554
de Mello Donegá, C., Liljeroth, P., & Vanmaekelbergh, D. (2005) · Small · doi:10.1002/smll.200500239 · Cited by 511
Metadata
- Authors
- Drndić, M., Jarosz, M. V., Morgan, N. Y., Kastner, M. A., & Bawendi, M. G.
- Venue
- Journal of Applied Physics
- Publisher
- AIP Publishing
- Published
- 2002-12-15
- Volume
- 92
- Issue
- 12
- Pages
- 7498-7503
- ISSN
- 0021-8979 (ISSN-L)
- 1089-7550
- OpenAlex
- W3102766544
- Cited by
- 187
- References
- 0
- FWCI
- 5.85
- Type
- journal article
- Language
- en
- Open access
- green
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- Drndić, M., Jarosz, M. V., Morgan, N. Y., Kastner, M. A., & Bawendi, M. G. (2002). Transport properties of annealed CdSe colloidal nanocrystal solids. Journal of Applied Physics. https://doi.org/10.1063/1.1523148
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