DocumentCode
3691379
Title
Charge carrier dynamics in benzoporphyrin thin films investigated by time-resolved THz spectroscopy
Author
Kaoru Ohta;Sho Hiraoka;Yuto Tamura;Hiroko Yamada;Keisuke Tominaga
Author_Institution
Molecular Photoscience Research Center, Kobe University, Kobe 657-8501 Japan
fYear
2015
Firstpage
1
Lastpage
2
Abstract
We performed optical pump-terahertz (THz) probe measurements to investigate the charge carrier dynamics of benzoporphyrin (BP) and BP-based bulk heterojunction (BHJ) thin films. In both samples, we observed an instantaneous appearance of transient THz signals which are attributed to polaron pairs. These polaron pairs recombine and/or trap in a defect site to localize within 1 ps time scale. From analysis of the transient complex conductivity spectra, we found that the conductivity spectra can be well reproduced by Drude-Smith model. For BP-based BHJ films, a faster decay dynamics of the transient THz signals was observed compared to BP films.
Keywords
"Charge carriers","Transient analysis","Optical variables measurement","Conductivity","Optical films","Optical pumping","Probes"
Publisher
ieee
Conference_Titel
Infrared, Millimeter, and Terahertz waves (IRMMW-THz), 2015 40th International Conference on
ISSN
2162-2027
Electronic_ISBN
2162-2035
Type
conf
DOI
10.1109/IRMMW-THz.2015.7327532
Filename
7327532
Link To Document