Dresden 2014 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 108: Poster: Ultra-fast phenomena / Optical properties / Semiconductor laser / Devices and device concepts

HL 108.29: Poster

Thursday, April 3, 2014, 17:00–20:00, P1

Optical gas sensing by micro-photoluminescence on single ZnO nanowires — •Julian Jakob, Manfred Madel, Sebastian Bauer, Florian Huber, and Klaus Thonke — Institute of Quantum Matter / Semiconductor Physics Group, Ulm University

Nanostructures are very promising candidates for gas sensing applications due to their high surface to volume ratio. Adsorption of oxidative and reductive gases causes a typical band bending near the surface, which leads to a change in the thickness of the depletion layer. In micro-photoluminescence measurements this results in a change of the emission intensity when switching between different ambient gas atmospheres.

An improvement of the sensitivity could be achieved by the use of different metal catalysts evaporated onto the nanowire surface. Investigations of single nanowires enable conclusions of the effect of nanowire form and diameter, and the sensitivity relating to different gas-atmospheres.