Dresden 2003 – scientific programme

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HL: Halbleiterphysik

HL 19: Organische Halbleiter I

HL 19.1: Talk

Tuesday, March 25, 2003, 11:00–11:15, BEY/81

Field-effect Mobility of Charge Carriers in Thin Films of Spiro-linked Compounds — •Tobat Saragi, Thomas Fuhrmann, and Josef Salbeck — Makromolekulare Chemie und Molekulare Materialien, Universität Kassel, Heinrich-Plett-Str. 40, 34109 Kassel

Amorphous molecular glasses are important materials for organic light emitting diodes and other organic optoelectronic devices. For hole- and electron transport, charge transporting materials with high glass transition temperature and high charge mobility are required. By the field-effect transistor method, we measured the hole mobility for the high-Tg molecular glasses 2,2,7,7-tetrakis-(diphenylamino)-9,9-spirobifluorene (Spiro-TAD) and 2,2,7,7-tetra-(3-methyldiphenylamino)-9,9-spirobifluorene (Spiro-TPD). The film morphology, the influence of oxidizing atmospheres and temperature dependence are studied. The obtained mobility values are compared with data for the parent compounds and with time-of-flight data.