OPTICAL-EXCITATIONS OF POLY(3-BUTYLTHIOPHENE) AND HIGH ELECTRON-AFFINITY SUBSTITUTED POLY(3-BUTYLTHIOPHENE)

Authors
GREENWALD Y WEI X JEGLINSKI S POPLAWSKI J EHRENFREUND E SPEISER S VARDENY ZV
Citation
Y. Greenwald et al., OPTICAL-EXCITATIONS OF POLY(3-BUTYLTHIOPHENE) AND HIGH ELECTRON-AFFINITY SUBSTITUTED POLY(3-BUTYLTHIOPHENE), Synthetic metals, 69(1-3), 1995, pp. 321-324
Citations number
9
Categorie Soggetti
Physics, Condensed Matter","Metallurgy & Metallurigical Engineering
Journal title
Synthetic metals → ACNP
ISSN journal
03796779
Volume
69
Issue
1-3
Year of publication
1995
Pages
321 - 324
Database
ISI
SICI code
0379-6779(1995)69:1-3<321:OOPAHE>2.0.ZU;2-0
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 PET, using photo-induced absorption (PA) and optically de tected magnetic resonance PA (PADMR) spectroscopies. The PA spectra re veal two main absorption bands; one at 1.4-1.7 eV, which is composed o f contributions from both S=1 and S=1/2 species, and another at 0.5 eV which is due to S=1/2 charged species. Our results are explained with in a picture where the S=1 species are triplet excitons and the S=1/2 species are photogenerated polarons.