Frequency up-conversion in nonpolar a-plane GaN/AlGaN based multiple quantum wells optimized for applications with silicon solar cells

We have described a method for structural parameters optimization of GaN/AlGaN multiple quantum well based up-converter for silicon solar cells. It involves a systematic tuning of individual step quantum wells by use of the genetic algorithm for global optimization. In quantum well structures, the u...

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Bibliographic Details
Published in:Journal of applied physics 2014-07, Vol.116 (3)
Main Authors: Radosavljević, S., Radovanović, J., Milanović, V., Tomić, S.
Format: Article
Language:English
Subjects:
ALGORITHMS
ALUMINIUM COMPOUNDS
Aluminum gallium nitrides
Applied physics
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
CONVERSION
DENSITY MATRIX
Design optimization
GALLIUM NITRIDES
Genetic algorithms
Global optimization
Intersubband transitions
NONLINEAR PROBLEMS
OPTIMIZATION
PHOTONS
Photovoltaic cells
QUANTUM WELLS
Silicon
SILICON SOLAR CELLS
Solar cells
Up-converters
Upconversion
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Description
Summary:We have described a method for structural parameters optimization of GaN/AlGaN multiple quantum well based up-converter for silicon solar cells. It involves a systematic tuning of individual step quantum wells by use of the genetic algorithm for global optimization. In quantum well structures, the up-conversion process can be achieved by utilizing nonlinear optical effects based on intersubband transitions. Both single and double step quantum wells have been tested in order to maximize the second order susceptibility derived from the density matrix formalism. The results obtained for single step wells proved slightly better and have been further pursued to obtain a more complex design, optimized for conversion of an entire range of incident photon energies.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4890029