Dresden 2009 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 9: Poster 1

HL 9.103: Poster

Monday, March 23, 2009, 14:30–17:00, P2

Wet chemical grown ZnO nanowires for use in polymer-hybrid-LEDs — •Jan-Peter Richters, Apurba Dev, and Tobias Voss — Institute of Solid State Physics, University of Bremen, P.O. Box 330440, D-28334 Bremen

Due to their large surface-to-volume ratio and the photon confinement, ZnO nanowires are good candidates for applications in nanoscaled sensor technology and optoelectronics in the blue-UV spectral region. Especially low-temperature grown ZnO nanowires are very promising candidates for the production of environmentally friendly and cost-efficient solar cells and light emitting diodes. The difficulties in p-type doping of ZnO have led to a huge variety of approaches to replace the missing p-type component by e.g. ionic liquids or p-type conductive polymers.

We report on wet-chemically grown ZnO nanowire arrays grown on various substrates with very good homogeneity for areas as large as 1.5 × 1.5 cm². The typical dimensions of the nanowires are about 100 nm in diameter and 2 µm in length. The crystalline structure is investigated by using TEM measurements. Photoluminescence measurements (4K up to room-temperature) show clear excitonic features which indicate an overall good optical quality with low visible deep-level luminescence. We processed ZnO nanowire / PEDOT:PSS compound structures that act as light emitting diodes and report a high rectification ratio of about 10⁵ and current densities up to 50 mA/mm².