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Mechanism of Carrier Generation in Poly(phenylene vinylene): Transient Photoconductivity and Photoluminescence at High Electric Fields

Cited 60 time in Web of Science Cited 66 time in Scopus
Authors
Moses, D.; Okumoto, H.; Lee, Changhee; Heeger, A. J.; Ohnishi, T.; Noguchi, T.
Issue Date
1996-08-15
Publisher
The American Physical Society
Citation
Phys. Rev. B 54, 4748
Abstract
The carrier generation mechanism in poly(phenylene vinylene), is addressed by studying the transient photoconductivity and the photoluminescence as a function of the external electric field E in samples oriented by tensile drawing. The transient photocurrent is proportional to E at low fields, but increases nonlinearly for E>105 V/cm. The field at which the photoconductivity becomes nonlinear (the onset field, E0pc) depends on the degree of alignment: the higher the draw ratio, the lower E0pc. The dependence of the photocurrent on E is similar to the dependence of the dark current on E; both imply a field-dependent mobility (rather than field-dependent carrier generation). The onset field for the nonlinear photoconductivity is, however, different from the onset field for quenching the luminescence (E0pl). Thus, contrary to expectations for strongly bound neutral excitons as the elementary excitations, the high-field increase in photocurrent and the corresponding decrease in photoluminescence are not proportional, indicating that field-induced carrier generation is not significant.
ISSN
1098-0121
Language
English
URI
https://hdl.handle.net/10371/13623
DOI
https://doi.org/10.1103/PhysRevB.54.4748
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Electrical and Computer Engineering (전기·정보공학부)Journal Papers (저널논문_전기·정보공학부)
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