Premium
Time‐dependent charge trap distribution function in polyaniline films
Author(s) -
Bondarenko Vladimir E.,
Zhuravleva Tatyana S.
Publication year - 1998
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/(sici)1099-1581(1998100)9:10/11<619::aid-pat849>3.0.co;2-o
Subject(s) - polyaniline , materials science , photocurrent , nanosecond , relaxation (psychology) , exponential function , stretched exponential function , photoconductivity , trap (plumbing) , dispersion (optics) , electron , polymer , molecular physics , analytical chemistry (journal) , laser , composite material , optics , optoelectronics , physics , chemistry , psychology , social psychology , mathematical analysis , mathematics , quantum mechanics , polymerization , chromatography , meteorology
Relaxation processes of photoconductivity in emeraldine base (non‐conductive form of polyaniline) are investigated under nanosecond laser excitation. Photocurrent relaxation data are approximated well by the stretched exponential function F 1 ( t ) = A 1 exp[−( t/τ str ) β ] in the time interval from 0.45 to 40 ms. It was found that the parameters τ str and β of the function F 1 ( t ), which also characterize the energy distribution function of the electron traps, increased with time and allow an estimation of the decrease of the averaged trap depth dispersion in time. These parameters also demonstrated irregular behavior in the temperature range 180–300 K, forming a broad maximum at the temperatures of β ‐transition to the torsional motion of the rings along the polymer backbone in polyaniline from 180 to 260 K. © 1998 John Wiley & Sons, Ltd.