Regensburg 2002 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 10: Funktionalisierte Polymere
CPP 10.9: Vortrag
Dienstag, 12. März 2002, 18:50–19:10, H38
Polarization-Sensitive Polymeric Photodiodes — •Achmad Zen1, Christian Bauer2, Udom Asawapirom3, Ullrich Scherf3, Rainer Hagen4, Serguei Kostromine4, Rainer Mahrt5, and Dieter Neher1 — 1University of Potsdam, Institute of Physics, Am Neuen Palais 10, D-14469, Potsdam — 2University of Marburg, Institute of Physics, Renthof 5, D-35032, Marburg — 3University of Potsdam, Institute for Physical Chemistry and Theoretical Chemistry, Karl-Liebknecht Str.24-25, D-14476,Golm — 4Bayer AG,D-51368 Leverkusen — 5IBM Research, Zurich Research Laboratory, Saeumer-Str 4, CH-8803 Rueschlikon, Switzerland
Polarization sensitive photodiodes have been constructed utilizing an aligned polyfluorene (PF) layer. The diodes comprise an ultrathin photooriented layer of a liquid-crystalline photoaddressable polymer (PAP), which had previously been shown to act as a stable alignment material for polyfluorenes with reasonable charge transport properties [1]. The diodes exhibit a pronounced dependence of the photocurrent on the polarization of the incident light. The action spectrum is symbatic for light polarized perpendicular to the PF alignment direction but exhibits antibatic characteristics for parallel polarized light. These features are present for both forward and reverse bias and they are almost independent of voltage. Two models are presented to explain these particular properties, which take into account that photogeneration occurs only in part of the polyfluorene layer. [1] D.Sainova et al, Advanced Functional Material, 2002,12, 1-9.