Author/Authors :
Greenwald، نويسنده , , Y. and Wei، نويسنده , , X. and Jeglinski، نويسنده , , S. and Poplawski، نويسنده , , J. and Ehrenfreund، نويسنده , , E. and Speiser، نويسنده , , S. and Vardeny، نويسنده , , Z.V.، نويسنده ,
Abstract :
We have characterized the long lived photoexcitations in thin films of poly(3-butylthiophene) [PBT] and co-polymers made of PBT and acceptor substituted PBT, using photo-induced absorption (PA) and optically detected magnetic resonance PA (PADMR) spectroscopies. The PA spectra reveal two main absorption bands; one at 1.4-1.7 eV, which is composed of contributions from both S=1 and S=12 species, and another at 0.5 eV which is due to S=12 charged species. Our results are explained within a picture where the S=1 species are triplet excitons and the S=12 species are photogenerated polarons.
