Series in Microelectronics
edited by
Qiuting
Huang
Andreas Schenk
Mathieu Maurice Luisier
Bernd
Witzigmann
Vol. 225: Zhelio Andreev,
Physics-based Simulation of III-V Nitride LEDs:
The Role of Polarization.
2015. XII, 132 pages. € 64,00.
ISBN 978-3-86628-542-2
Abstract:
This work presents a study of polarization effects in III-V nitride
LEDs. The goal is to give a complete overview of the effects caused by built-in
polarization in those devices using novel numerical simulation approaches.
The
first part describes the internal efficacy in LED devices with different
polarization, using a semi-classical approach. For the modeling of the LED
structure a semi-classical drift-diffusion model developed within the author's research
group is used. The effect of different materials and polarizations on the
efficacy is studied. A novel method for improving the efficacy using a
quaternary AlInGaN material is proposed.
In
the second part a new approach for III-V nitride simulation, implementing
Non-Equilibrium Greens Functions (NEGF) is presented. NEGF as a fully quantum
mechanical simulation provides a better overview of the spatial and energetic
distribution of carriers inside the LED structure, and can be used for detailed
understanding of the processes taking place in polar and non-polar devices.
About the Author
Zhelio Andreev was born in Burgas,
Bulgaria, in 1982. In 2005 he obtained his Bachelor degree from Sofia
University, Bulgaria and in 2008 his Master degree from Jacobs University,
Bremen. Subsequently he joined the Computational Electronics and Photonics
Group at the University of Kassel. In 2015 he completed his doctorate on the
computational modeling study of polarization effects in III-V nitride LEDs. His
research interest comprises the improvement of efficacy in semiconductor light
emitting devices.
Keywords: carrier
transport; Polarization; energy distribution; scattering; Nitride LEDs; III-V
Nitride Devices
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