期刊
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
卷 50, 期 21, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1361-6455/aa8ca5
关键词
upconversion; photonic multilayer structures; photon management; light trapping; optimal design
资金
- Baden-Wurttemberg Ministry of Science, Research and Arts
- Baden-Wurttemberg Ministry of Finance and Economy
- Headquarters of the Fraunhofer-Gesellschaft in Munich
We devise an optimised bi-component multi-layered dielectric stack design to enhance the local irradiance for efficient photovoltaic upconversion materials. The field intensity profile throughout the photonic structure is numerically optimised by appropriate tuning of the individual layers' thicknesses. The optimality of the thus inferred structure is demonstrated by comparison with an analytically derived upper bound. The optimised local irradiance is found to increase exponentially with the number of layers, its rate determined by the permittivity ratio of the two material components. Manufacturing errors which induce deviations from the optimised design are accounted for statistically, and set a finite limit to the achievable enhancement. Notwithstanding, realistic assumptions on manufacturing errors still suggest achievable irradiances which are significantly larger than those obtained with the recently proposed Bragg stack structures.
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