Charge transport in mixed CdSe and CdTe colloidal nanocrystal films

Autor:	Scott M. Geyer, Jonathan E. Halpert, Tamar Mentzel, Moungi G. Bawendi, Venda J. Porter, Marc Kastner
Rok vydání:	2010
Předmět:	Materials science business.industry Charge (physics) Condensed Matter Physics Thermal conduction Cadmium telluride photovoltaics Electronic Optical and Magnetic Materials Colloid X-ray photoelectron spectroscopy Nanocrystal Quantum dot Electrode Optoelectronics business
Zdroj:	Physical Review B. 82
ISSN:	1550-235X 1098-0121
DOI:	10.1103/physrevb.82.155201
Popis:	We report the influence of trap states on charge transport through films of mixed CdTe and CdSe nanocrystals (NCs) between lateral electrodes, through layered films of CdTe and CdSe NCs in a layered geometry, and through films of CdTe/CdSe nanobarbells in a layered geometry. We find that an electron trapping state on the surface of the CdTe NCs dominates the conduction in all devices studied. X-ray photoelectron spectroscopy and thermal activation studies implicate unpassivated or oxidized Te as the electron-trapping site.
Databáze:	OpenAIRE
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