Berlin 2005 – wissenschaftliches Programm

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SYOO: Organic Optoelectronics and Photonics

SYOO 1: Organic Field-Effect Transistors

SYOO 1.2: Vortrag

Montag, 7. März 2005, 10:00–10:15, TU C130

Redox behaviour and charge transport in molecular azo glasses — •Michael Arlt, Tobat P.I. Saragi, Irina Suske, Josef Salbeck, and Thomas Fuhrmann-Lieker — Makromolekulare Chemie und molekulare Materialien, FB Naturwissenschaften, Universität Kassel, Heinrich-Plett-Str. 40, 34109 Kassel

Low bandgap materials are interesting for bipolar charge transport in organic electronic devices. We demonstrate that the molecular azo glass N,N′-bis(4-phenyl)-N,N′-bis[(4-phenylazo)-phenyl]benzidine (AZOPD) can act as hole-transport as well as electron-transport material. Electrochemical measurements show reversible oxidation and reduction behaviour with redox potentials corresponding to an ionization energy of 5.2 eV and an electron affinity of 3.1 eV. p- and n-type organic field-effect transistor (OFET) structures are investigated in which holes and electrons are injected from Au bottom and Mg top contacts, respectively. The transistor characteristics are sensitive to light due to the photoisomerization property of the material.