CUED Publications database

Temperature- and field-dependent electron and hole mobilities in polymer light-emitting diodes

Bozano, L and Carter, SA and Scott, JC and Malliaras, GG and Brock, PJ (1999) Temperature- and field-dependent electron and hole mobilities in polymer light-emitting diodes. Applied Physics Letters, 74. pp. 1132-1134. ISSN 0003-6951

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Abstract

We have studied the transport properties of electron- and hole-dominated MEH-PPV, poly(2-methoxy,5-(2′-ethyl-hexoxy)-p-phenylene vinylene), devices in the trap-free limit and have derived the temperature-dependent electron and hole mobilities (μ=μ0eγ√E) from the space-charge-limited behavior at high electric fields. Both the zero-field mobility μ0and electric-field coefficient γ are temperature dependent with an activation energy of the hole and electron mobility of 0.38±0.02 and 0.34±0.02 eV, respectively. At 300 K, we find a zero-field mobility μ0on the order of 1±0.5×10-7cm2/V s and an electric-field coefficient γ of 4.8±0.3×10-4(m/V)1/2for holes. For electrons, we find a μ0an order of magnitude below that for holes but a larger γ of 7.8±0.5×10-4(m/V)1/2. Due to the stronger field dependence of the electron mobility, the electron and hole mobilities are comparable at working voltages in the trap-free limit, applicable to thin films of MEH-PPV. © 1999 American Institute of Physics.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: UNSPECIFIED
Depositing User: Cron Job
Date Deposited: 10 Sep 2017 20:11
Last Modified: 18 Apr 2019 01:54
DOI: 10.1063/1.123959