Regensburg 2013 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 28: Poster Session: Graphen; Transport properties; Transport in high magnetic fields / Quantum Hall effect; Metal-semiconductor hybrid systems

HL 28.20: Poster

Montag, 11. März 2013, 16:00–20:00, Poster A

Charge Transport and Passivation of ZnO-TFTs Deposited by Spray Pyrolysis — •Yulia Trostyanskaya, Marlis Ortel, Nataliya Kalinovish, Gerd Roeschenthaler, and Veit Wagner — Research Center for Functional Materials and Nanomolecular Science, Jacobs University Bremen, Campus Ring 1, 28759 Bremen, Germany

ZnO serves as a suitable semiconductor for thin film transistors (TFTs) due to its high mobility, wide band gap and simple and cheap way of deposition e. g. via spray pyrolysis. However the electronic properties of the material have a disadvantage of being highly sensitive to the surrounding environment due to the formation of surface states. In this work flour terminated diketones e.g. 4,4,4-trifluoro-1-(3-fluorophenyl)1-3-butanedione were bound on the zinc oxide surface to reduce the impact of the environment. The effect on the charge transport processes in the semiconductor was analyzed by bias stress measurements and temperature dependent electrical measurements which were correlated to optical and morphological investigations. The passivation of the TFTs induced an increase of the linear mobility from 4cm2/Vs to 7.3cm2/Vs and improved the bias stress stability remarkably which is in good agreement with a shift of the optical band gap. Furthermore, significant difference in the conduction processes with and without passivation was found. While similar activation energies are found above 100K clear difference is observed below, reflecting the passivated states.