Regensburg 2013 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 91: Poster Session: Quantum dots and wires: preparation & characterization & optical properties & transport properties

HL 91.19: Poster

Thursday, March 14, 2013, 16:00–20:00, Poster A

Spatial resolved optical pH- and bias response of (In, Ga)N nanowires and quantum dots — •Sabrina Darmawi, Jens Wallys, Pascal Hille, Martin Eickhoff, and Peter J. Klar — I. Physikalisches Institut, JLU, Heinrich-Buff-Ring 16, 35392 Gießen

We present photoluminescence (PL) imaging measurements of GaN nanowire ensembles and InGaN quantum dots in electrolyte solutions of different pH in a three electrode setup. By application of external bias the PL intensity and its pH sensitivity can be controlled. A microscope system attached to the measurement chamber transfers a magnified image of the sample onto the slit of a subtractive double spectrometer which acts as a tunable band pass and allows for PL intensity imaging at different emission wavelengths with a CCD system. The response of the PL intensity of the sample to the pH value of the surrounding electrolyte and the applied bias will be discussed.