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Hole‐mobility limits for the Zn(OC) 2 organic semiconductor obtained by SCLC and field‐effect measurements
Author(s) -
Landi Giovanni,
Tunc Ali Veysel,
De Sio Antonietta,
Parisi Jürgen,
Neitzert HeinzChristoph
Publication year - 2016
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201532931
Subject(s) - ambipolar diffusion , electron mobility , materials science , field effect transistor , organic semiconductor , transistor , optoelectronics , charge carrier , space charge , semiconductor , diode , common emitter , organic electronics , organic field effect transistor , gate dielectric , electron , voltage , electrical engineering , physics , quantum mechanics , engineering
The hole mobility of a semiconducting film with a new type of small molecule has been determined by electrical characterization with two different device geometries. The small molecule, namely Zn(OC) 2 , consists of oxadiazole groups (O), that act as electron conductor and blue emitter, and carbazole groups (C), that are hole conductors, which are arranged around a central Zn‐atom. This disordered organic material has in principal ambipolar conduction properties. In both the organic devices investigated, that is, a vertical diode and a bottom‐gate organic field effect transistor, the transport is dominated by holes. In the diode structure, the charge carrier transport shows a dependence from the electric field with a space charge limited current characteristic. The hole mobility value is several orders of magnitude higher as compared to the one extracted from the characteristics of the organic transistor. This large difference in the charge carrier transport properties for the two different device configurations is due to the strong influence of the dielectric/semiconductor interface which degrades the hole transport in the organic field effect transistor.