Abstract

We have experimentally measured the current-voltage and capacitance-voltage characteristics of Au/amorphous AsxSe1 - x (x ≤ 0.05)/Zr trilayer structures at temperatures from 4 to 295 K. The observed capacitance of structures with an amorphous AsxSe1 - x (a-AsxSe1 - x) thickness of × 0.4 to × 2.8 μm does not significantly change over the entire range of applied bias (- 5 V to 5 V), indicating that the a-AsxSe1 - x films are fully depleted and thus the structures are Mott barriers. The current-voltage (I-V) characteristics of the a-As0.03Se0.97 device at low (< 3000 V/cm) to moderate fields (3000 V/cm-10000 V/cm) follow the predictions of trap limited space charge conduction theory, as they exhibit Ohmic behavior at low fields and trap limited space charge current at moderate fields. According to the trap limited space charge current model of Lampert, the a-As 0.03Se0.97 film has an effective hole mobility, Θμ (with Θ < 1), of × 5 × 10- 7 cm 2/V-sec at 295 K. This value is similar to, but consistently lower than previously reported mobilities inferred from time of flight measurements. The current at high fields (> 104 V/cm) increases rapidly with applied field as a result of carrier emission from localized states and is consistent with transport by the Poole-Frenkel mechanism. A permanent transition to a high conductance state (× 10- 3 S) is observed after exposure to very high electric fields (× 4 × 105V/cm).

Original languageEnglish (US)
Pages (from-to)3366-3372
Number of pages7
JournalJournal of Non-Crystalline Solids
Volume357
Issue number18
DOIs
StatePublished - Sep 15 2011

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Electric properties
electrical properties
capacitance-voltage characteristics
Electric potential
electric potential
Capacitance
capacitance
electric fields
Electric fields
temperature
Temperature

Keywords

  • Amorphous As alloyed Se
  • Electrical characteristics
  • Space charge limited current

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Ceramics and Composites
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry

Cite this

Electrical properties of AsxSe1-x (x ≤ 0.05) Mott-barriers. / Bharathan, P.; Bandyopadhyay, S.; Espinasse, M.; Singh, Rakesh; Newman, Nathan.

In: Journal of Non-Crystalline Solids, Vol. 357, No. 18, 15.09.2011, p. 3366-3372.

Research output: Contribution to journalArticle

Bharathan, P. ; Bandyopadhyay, S. ; Espinasse, M. ; Singh, Rakesh ; Newman, Nathan. / Electrical properties of AsxSe1-x (x ≤ 0.05) Mott-barriers. In: Journal of Non-Crystalline Solids. 2011 ; Vol. 357, No. 18. pp. 3366-3372.
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AU - Newman, Nathan

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AB - We have experimentally measured the current-voltage and capacitance-voltage characteristics of Au/amorphous AsxSe1 - x (x ≤ 0.05)/Zr trilayer structures at temperatures from 4 to 295 K. The observed capacitance of structures with an amorphous AsxSe1 - x (a-AsxSe1 - x) thickness of × 0.4 to × 2.8 μm does not significantly change over the entire range of applied bias (- 5 V to 5 V), indicating that the a-AsxSe1 - x films are fully depleted and thus the structures are Mott barriers. The current-voltage (I-V) characteristics of the a-As0.03Se0.97 device at low (< 3000 V/cm) to moderate fields (3000 V/cm-10000 V/cm) follow the predictions of trap limited space charge conduction theory, as they exhibit Ohmic behavior at low fields and trap limited space charge current at moderate fields. According to the trap limited space charge current model of Lampert, the a-As 0.03Se0.97 film has an effective hole mobility, Θμ (with Θ < 1), of × 5 × 10- 7 cm 2/V-sec at 295 K. This value is similar to, but consistently lower than previously reported mobilities inferred from time of flight measurements. The current at high fields (> 104 V/cm) increases rapidly with applied field as a result of carrier emission from localized states and is consistent with transport by the Poole-Frenkel mechanism. A permanent transition to a high conductance state (× 10- 3 S) is observed after exposure to very high electric fields (× 4 × 105V/cm).

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