Berlin 2005 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
SYOO: Organic Optoelectronics and Photonics
SYOO 6: Poster
SYOO 6.19: Poster
Montag, 7. März 2005, 18:00–20:00, Poster TU A
Charge transport and recombination in bulk heterojunction plastic solar cells — •A. J. Mozer1, N. S. Sariciftci1, M. Westerling2, R. Österbacka2, and G. Juska3 — 1Linz Institute for Organic Solar Cells (LIOS) Johannes Kepler University Linz, Austria — 2Department of Physics, Åbo Akademi University, Turku, Finland — 3Department of Solid State Electronics, Vilnius University, Lithuania
The high quantum yield of charge generation within the interpenetrating network of the electron donating conjugated polymer and the electron accepting fullerene derivative (bulk heterojunction)is a prerequisite for fabrication of efficient photovoltaic cells, yet the charge collection efficiency depends on the mobility and lifetime of the charge carriers. The charge carrier mobility and recombination in the blend of MDMO-PPV/PCBM are studied simultaneously using the novel photoinduced charge carrier extraction by a linearly increasing voltage (photo-CELIV). In this technique, the charge carriers are photogenerated by a strongly absorbed laser flash, and extracted by the application of a reverse bias voltage pulse after an adjustable delay time (tdel). From the maximum of the extraction current pulse, the mobility is calculated, and from the number of the extracted charge carriers at various tdel, the recombination is studied. The photo-CELIV transients have been recorded as a function of the light intensity (charge carrier concentration), delay time and applied electric field at various temperatures, and the results indicate that the observed delay time-dependent mobility is related to a time dependent energy relaxation of the charge carriers into deeper traps.