Series in Microelectronics
edited by Wolfgang
Fichtner
Qiuting Huang
Heinz Jäckel
Gerhard Tröster
Bernd Witzigmann
Marcus Deppner,
Design of Nanorod-LEDs
using
Computational Modelling
2013. 140 pages. € 64.00.
ISBN 978-3-86628-459-3
Abstract:
Gallium nitride based light emitting diodes (LEDs) have been established
as powerful devices applicable for general lighting. The further development
towards higher efficiencies is retarded by an efficiency droop at high
injection currents. Furthermore the lack of highly efficient green emitters
prohibits the fabrication of high-brightness white LEDs without lossy wavelength converters.
This dissertation deals with the design of a novel kind of LEDs, that is expected to overcome the aforementioned
restrictions: the nanorod approach.
In the first part, the advantages of nanorod
LEDs are outlined. Semiconductor physics with a focus on the anisotropic static
and electronic properties of gallium nitride based LEDs are discussed
extensively. A novel Auger model accounting for this anisotropy is introduced.
Furthermore, a connection between Auger recombination and carrier leakage is
proposed as a sophisticated explanation for efficiency droop.
The second part of the dissertation deals with physics-based simulations
of two different nanorod designs: the core-shell approach, that is expected to find a remedy for efficiency
droop, and monolithic white emitters as an alternative for wavelength-converted
LEDs. The simulations employ an in-house developed transport simulator with the
capability to include quantisation effects in quantum
regions.
A final comparison of the analysed designs
concludes the thesis.
Marcus Deppner was born in Halberstadt, Germany, in 1984. In
2009 he finished his studies in electrical engineering at the Otto von Guericke
University Magdeburg, Germany, graduating as Dipl.-Ing.
Subsequently he joined the Computational Electronics and Photonics Group at the
University of Kassel. In 2013 he completed his doctorate on the computational modelling and physics-based simulation of III-nitride nanorod-LEDs.
Keywords: LED, Nanorod-LEDs
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