Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

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

HL 108.20: Poster

Donnerstag, 3. April 2014, 17:00–20:00, P1

Impact of elastic- and inelastic scattering on the performance of quantum-cascade lasers — •Yuri V. Flores, Sergii S. Kurlov, Mikaela Elagin, Grygorii Monastyrskyi, Mykhaylo P. Semtsiv, and W. Ted Masselink — Department of Physics, Humboldt University Berlin, Newtonstr. 15, D-12489 Berlin, Germany

Elastic- and inelastic scattering are the principal components of the leakage current in quantum-cascade lasers. Their understanding is very important, since the leakage current has a considerable impact on the overall performance of quantum-cascade lasers. In particular, this current affects two vital characteristics: The threshold current and the quantum efficiency. A large leakage current reduces the injection efficiency into the upper laser state which implies that more electrons need to be injected into the device in order to achieve the required population inversion, increasing ultimately the threshold current and reducing the quantum efficiency.

In this contribution, we analyze the relative magnitudes of the elastic- and inelastic components of the leakage current. The inelastic part is modeled as a two-particle process involving an electron and a LO-phonon. The elastic non-radiative process considers that an electron can increase- or lose its potential energy due to the roughness of the layers' interfaces. These two components are modeled and its dependence on the lattice and electron-temperatures is analyzed.