Photoexcited Defects in Poly(3-Methylthiophene): Light Induced Electron Spin Resonance and PHotoinduced Absorption

J. Poplawski, E. Ehrenfreund, K. Cromack, A. J. Epstein, A. J. Frank

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Abstract

Light induced electron spin resonance (LESR) and photoinduced absorption (PA) are reported for poly(3-methylthiophene) (P3MT). The LESR is composed of a single line at g≅2 whose position, width and intensity are dependent on the exciting photon energy, ηωL. The LESR line intensity shows a sharp peak at 2.05 eV, where the line is the narrowest and it has the smallest g. The PA spectrum is composed of infrared active vibrations (IRAV) absorption bands and two midgap electronic bands, at 0.39 and 1.28 eV. The intensity of these three features as a function of ηωL is similar to each other and shows a sharp peak at 2.10 eV. Based on these observations, the possible spin-charge relationships for the photoinduced defects are discussed.

Original languageAmerican English
Pages (from-to)1225-1229
Number of pages5
JournalSynthetic Metals
Volume41
Issue number3
DOIs
StatePublished - 1991

NREL Publication Number

  • SERI/JA-233-42944

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