Dresden 2003 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 19: Organische Halbleiter I
HL 19.3: Vortrag
Dienstag, 25. März 2003, 11:30–11:45, BEY/81
Cationic dyes as a new path to n-type doping of organic matrixes — •Ansgar Werner1, Fenghong Li1, Kentaro Harada1, Martin Pfeiffer1, Torsten Fritz1, Susanne Machill2, and Karl Leo1 — 1Institut für Angewandte Photophysik; TU Dresden; 01069 Dresden — 2Institut für Analytische Chemie; TU Dresden; 01069 Dresden
n-type doping of organic matrixes is gaining increasing attention, because it can improve both electron injection and electron transport devices such as organic light emitting devices or organic solar cells. Organic donor and acceptors as dopants are considered to be crucial to prepare stable multilayer devices with doped charge transport layers. Howver strong donors capable of doping commonly employed electron transport materials are not available due to their chemical instability. We follow a new approach to n-type doping of organic matrices. We obtain an extremely oxygen-sensitive donor from a stable precursor compound in situ. Using the cationic dye Pyronin B chloride as a model precursor we have carried out a field effect study to characterize the properties of doped thin films. The results prove an increase in n-type conductivity when using Pyronin B chloride as the dopant precursor. The results are discussed in the framework of transport in disordered thin films according to a model proposed recently (B. Maennig et al, Phys. Rev. B, 64, 195208 (2001)). We propose a reaction route for the doping process which is backed by spectroscopic evidence.