Title :
Ultrafast spectroscopy of excitons and polaron pairs in organic photodetectors
Author :
Muller, Jakob Glarbo ; Lemmer, Uli ; Feldmann, J. ; Scharber ; Sariciftci ; Doppler
Author_Institution :
Ludwig-Maximilians-Univ., Munchen, Germany
Abstract :
Summary form only given. We use a femtosecond two pulse excitation scheme and monitor the charge generation directly by detecting the photocurrent correlation. We conclude that in organic photodetectors a significant portion of polaron pairs is strongly bound such that charge carrier generation only occurs after reexcitation by a second laser pulse. Polaron pairs are formed as intermediate states in pure conjugated polymers as well as in fullerene/polymer blend systems.
Keywords :
conducting polymers; excitons; photoconducting materials; photoconductivity; polarons; time resolved spectra; charge carrier photogeneration; charge generation; conjugated polymer; electron transfer; excitons; femtosecond two pulse excitation; functionalized fullerene; intermediate states; long-living pairs; organic light emitting diodes; organic photodetectors; para-phenylene; photocurrent correlation; polaron pairs; sandwich structures; time-delayed dissociation; ultrafast spectroscopy; very long lifetime; Excitons; Photoconducting materials; Photoconductivity;
Conference_Titel :
Quantum Electronics and Laser Science Conference, 2002. QELS '02. Technical Digest. Summaries of Papers Presented at the
Conference_Location :
Long Beach, CA, USA
Print_ISBN :
1-55752-708-3
DOI :
10.1109/QELS.2002.1031302
