Measurements of charge mobility and diffusion coefficient of conjugated electroluminescent polymers by time-of-flight method

Hao-En Tseng; Tzu-Hao Jen, Jan; Kang-Yung Peng; Show-An Chen
March 2004
Applied Physics Letters;3/1/2004, Vol. 84 Issue 9, p1456
Academic Journal
Charge mobilities (μ) and diffusion coefficients (D) of hole (μ[sub h], D[sub h]) and electron (μ[sub e], D[sub e]) of the conjugated electroluminescent polymers, poly(phenylene vinylene)s and polyfluorenes, have been measured by fitting of a theoretical photocurrent transient equation to time-of-flight photocurrent transients. The μ so obtained are in agreement with those from inflection points of photocurrent transients. The D value lumps all factors together that cause the dispersion of carriers, and the parameter Dq/μkT can be used as an indicator of the degree of dispersion. This fitting method allows extracting μ and D from highly dispersive photocurrent transients, even for the case in which no inflection point appears. © 2004 American Institute of Physics.


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