Temperature activated de-trapping processes in vacuum deposited sexithiophene thin films

Photoluminescence (PL) emission spectra of sexithiophene (6T) thin films grown on different substrates by organic molecular beam deposition (OMBD) are studied in the range of temperature from 300 to 7 K. Besides the two vibronic progressions detectable between 300 and 50 K, related to the radiative recombination of the free exciton and to a structural defect state, a new emission is observed at temperatures lower than 40 K, whose origin is discussed in terms of exciton bound to a structural defects. (C) 2002 Elsevier Science B.V. All rights reserved.

Investigation of photoluminscence (PL) emission spectra of sexithiopene (6T) thin films grown on different substrates by organic molecular beam deposition (OMBD) in the range of temperature from 300 to 7 K was presented. The results showed detection of a new emission, related to shallow electronic stage at temperature below 40 K in all investigated samples. The investigation of origin of this state, which showed different behavior with respect to the previously reported state was also done.