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Your search keyword '"Mikulla, M."' showing total 2 results
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2 results on '"Mikulla, M."'

1. Influence of the surface potential on electrical properties of [Al.sub.x][Ga.sub.1-x]N/GaN heterostructures with different Al-content: effect of growth method

Author

Kohler, K., Ambacher, O., Granzner, R., Schwierz, F., Buchheim, C., Menner, H.P., Bronner, W., Leuther, A., Quay, R., Mikulla, M., Muller, S., Aidam, R., Waltereit, P., Pletschen, W., and Kirste, L.

Subjects
Aluminum compounds -- Electric properties, Aluminum compounds -- Structure, Gallium nitrate -- Electric properties, Gallium nitrate -- Structure, Nickel compounds -- Electric properties, Nickel compounds -- Structure, Physics
Abstract

The effect of the growth method on the surface potential and on the sheet carrier concentration of GaN capped [Al.sub.x][Ga.sub.1-x]/GaN heterostructures is analyzed. The studies have shown that after the fabrication, the threshold voltage for a given Al-content is the same for samples grown with different methods because of the identical surface potential defined by the Ni Schottky gate.

Published
2010

2. Facet temperature reduction by a current blocking layer at the front facets of high-power InGaAs/AlGaAs lasers

Author

Rinner, F., Tomm, J.W., Thamm, E., Poprawe R., Rogg, J., Kelemen, M.T., Mikulla, M., and Weimann, G.

Subjects
Nonferrous metals -- Electric properties, Ablation (Vaporization technology) -- Observations, Physics
Abstract

The facet heating of a single-quantum well InGaAs/A1GaAs broad-area high-power laser-diodes emitting at 940 nm was reduced by the introduction of a 30 mu m long current blocking region located at the front facet of the laser. The temperature rise of 2 mm long and 200 mu m wide lasers is reduced by a factor of 3-4.

Published
2003

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