SHERP

Mechanism of Carrier Generation in Conducting Polymers

Cited 0 time in webofscience Cited 0 time in scopus
Authors
Moses, D.; Okumoto, H.; Comoretto, D.; Lee, Changhee; Heeger, A. J.; Ohnishi, T.; Noguchi, T.
Issue Date
1997
Publisher
Elsevier
Citation
Synth. Met. 84, 539
Keywords
Poly(phenylene vinylene) and derivativesCarrier generation
Abstract
The carrier generation mechanism in poly(phenylene vinylene), PPV, 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 in PPV is proportional to E at low fields, but increases nonlinearly for E > 104 V/cm. The field at which the photoconductivity becomes nonlinear (the onset field, Ededpc depends on the degree of alignment: the higher the draw ratio, the lower Edpc. The dependence of the photocurrent on E is similar to the dependence of the dark current on E, implying 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 (Edpl). 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 the carrier generation induced by the external field is not significant. The transient photocurrent is independent of photon energy in the measured range between 2.33–3.67 eV, indicating that carriers are the prime excitation in PPV.
ISSN
0379-6779
Language
English
URI
http://hdl.handle.net/10371/13649
DOI
https://doi.org/10.1016/S0379-6779(97)80851-X
Files in This Item:
There are no files associated with this item.
Appears in Collections:
College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Electrical and Computer Engineering (전기·정보공학부)Journal Papers (저널논문_전기·정보공학부)
  • mendeley

Items in S-Space are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse