Journal of physical chemistry. C, 2013-02, Vol.117 (8), p.3713-3717
2013
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Details
- Autor(en) / Beteiligte
- Titel
- Positive Temperature Coefficient of Resistance and Bistable Conduction in Lead Selenide Quantum Dot Thin Films
- Ist Teil von
- Journal of physical chemistry. C, 2013-02, Vol.117 (8), p.3713-3717
- Ort / Verlag
- Columbus, OH: American Chemical Society
- Erscheinungsjahr
- 2013
- Quelle
- Alma/SFX Local Collection
- Beschreibungen/Notizen
- We report the observation of a positive temperature coefficient of resistance in strongly coupled quantum dot (QD) arrays. Conductivities of lead selenide (PbSe) QD thin films treated with 1,2-ethanedithiol increase when cooled from room temperature to 78 K, consistent with bulk PbSe crystals and indicating bandlike transport. Small angle X-ray scattering and infrared absorption spectroscopy results confirm a very strong electronic coupling among QDs. These QD thin films also exhibit bistable conduction above 160 K. As the electric field reaches a threshold, on the order of 0.1 V/μm, the film conductance increases abruptly by up to 10 orders of magnitude and remains high until the bias voltage is reduced to about zero volts. This bistability is likely induced either by filament formation or by a trap-related electronic switching.
- Sprache
- Englisch
- Identifikatoren
- ISSN: 1932-7447eISSN: 1932-7455DOI: 10.1021/jp306893eTitel-ID: cdi_crossref_primary_10_1021_jp306893e
- Format
- –
- Schlagworte
- Condensed matter: electronic structure, electrical, magnetic, and optical properties, Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures, Electronic transport in multilayers, nanoscale materials and structures, Exact sciences and technology, Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation, Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures, Physics