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Black-box optimization of simulated light extraction efficiency from quantum dots in pyramidal gallium nitride structures
Linköpings universitet, Matematiska institutionen.
2019 (engelsk)Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
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.

sted, utgiver, år, opplag, sider
2019. , s. 61
Emneord [en]
Black-box optimization, Radial basis functions, Gallium nitride, light extraction efficiency, FDTD, surrogate functions, semiconductors, global optimization
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-162235ISRN: LiTH-MAT-EX--2019/10--SEOAI: oai:DiVA.org:liu-162235DiVA, id: diva2:1372819
Eksternt samarbeid
Polar Light Technologies
Fag / kurs
Applied Mathematics
Presentation
2019-08-26, Hopningspunkten, 581 83 Linköping, Linköping, 14:55 (engelsk)
Veileder
Examiner
Tilgjengelig fra: 2019-11-26 Laget: 2019-11-25 Sist oppdatert: 2019-11-26bibliografisk kontrollert

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