Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Black-box optimization of simulated light extraction efficiency from quantum dots in pyramidal gallium nitride structures
Linköping University, Department of Mathematics.
2019 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Microsized hexagonal gallium nitride pyramids show promise as next generation Light Emitting Diodes (LEDs) due to certain quantum properties within the pyramids. One metric for evaluating the efficiency of a LED device is by studying its Light Extraction Efficiency (LEE). To calculate the LEE for different pyramid designs, simulations can be performed using the FDTD method. Maximizing the LEE is treated as a black-box optimization problem with an interpolation method that utilizes radial basis functions. A simple heuristic is implemented and tested for various pyramid parameters. The LEE is shown to be highly dependent on the pyramid size, the source position and the polarization. Under certain circumstances, a LEE over 17% is found above the pyramid. The results are however in some situations very sensitive to the simulation parameters, leading to results not converging properly. Establishing convergence for all simulation evaluations must be done with further care. The results imply a high LEE for the pyramids is possible, which motivates the need for further research.

Place, publisher, year, edition, pages
2019. , p. 61
Keywords [en]
Black-box optimization, Radial basis functions, Gallium nitride, light extraction efficiency, FDTD, surrogate functions, semiconductors, global optimization
National Category
Computational Mathematics
Identifiers
URN: urn:nbn:se:liu:diva-162235ISRN: LiTH-MAT-EX--2019/10--SEOAI: oai:DiVA.org:liu-162235DiVA, id: diva2:1372819
External cooperation
Polar Light Technologies
Subject / course
Applied Mathematics
Presentation
2019-08-26, Hopningspunkten, 581 83 Linköping, Linköping, 14:55 (English)
Supervisors
Examiners
Available from: 2019-11-26 Created: 2019-11-25 Last updated: 2019-11-26Bibliographically approved

Open Access in DiVA

fulltext(4041 kB)16 downloads
File information
File name FULLTEXT01.pdfFile size 4041 kBChecksum SHA-512
9042da82f30bc0389c8013d0fa46a7a9b6640bbb43dc72c46836de808932824675ac64e96c6867f7f40c8aa430fafb80a37f1111fdb0ba2fe4742aad6182193b
Type fulltextMimetype application/pdf

By organisation
Department of Mathematics
Computational Mathematics

Search outside of DiVA

GoogleGoogle Scholar
Total: 16 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 107 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf