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Photoconductivity in CdSe quantum dot solids
Abstract
We report measurements of photoconductivity and electric field induced photoluminescence quenching in three-dimensional close-packed solids of colloidal CdSe quantum dots. Our measurements suggest that photoexcited, quantum confined excitons are ionized by the applied electric field with a rate that depends on both the size and surface passivation of the quantum dots. Separation of electron-hole pairs confined to the core of the quantum dot requires significantly more energy than separation of carriers trapped at the surface and occurs through tunneling processes. We present a simple resonant tunneling model for the initial charge separation step that qualitatively reproduces both the size and surface dependence of the photoconductivity as a function of applied field. We show that the charge generation efficiency increases with increasing temperature as nonradiative and radiative recombination pathways increasingly compete with charge separation.
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Self-citation
Metadata
- Authors
- Leatherdale, C. A., Kagan, C. R., Morgan, N. Y., Empedocles, S. A., Kastner, M. A., & Bawendi, M. G.
- Venue
- Physical Review B
- Publisher
- American Physical Society (APS)
- Published
- 2000-07-15
- Volume
- 62
- Issue
- 4
- Pages
- 2669-2680
- ISSN
- 0163-1829 (ISSN-L)
- 1095-3795
- OpenAlex
- W2045593685
- Cited by
- 295
- References
- 39
- FWCI
- 9.91
- Type
- journal article
- Language
- en
- Open access
- closed
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