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HL: Fachverband Halbleiterphysik

HL 21: Poster IB (Oxide semiconductors; II-VI and group IV semiconductors; Nanotubes and Buckyballs)

HL 21.19: Poster

Montag, 16. März 2015, 15:00–20:00, Poster B

The role of oxygen ambient in the Persistent Photoconductivity of ZnO nanowires — •Florian Huber, Manfred Madel, Martin Dickel, Bruno Amann, and Klaus Thonke — Institute of Quantum Matter / Semiconductor Physics Group, Ulm University

The origin of the Persistent Photoconductivity (PPC) in zinc oxide is a widely discussed topic. The reason for the PPC is frequently attributed to intrinsic defects, especially to oxygen vacancies which are reported to act as deep traps [1]. Besides these defects, the adsorption and desorption of oxygen on the surface of the material influences the PPC strongly.

We investigated in detail especially the kinetics of the slow photo-induced conductivity processes with respect to their photon energy, temperature, oxygen ambient and illumination time dependence. Energy barriers for the decay process after illumination are determined, and the experimental results are discussed in the frame of possible models.

[1] A. Janotti and C.G. Van de Walle, Applied Physics Letters 12, 122102 (2005)