Mainz 2017 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 44: Photonics II

Q 44.3: Talk

Thursday, March 9, 2017, 11:30–11:45, P 11

Optimisation of luminescence in multi-layered photonic structures to increase the efficiency of upconversion processes — •Fabian Spallek, Andreas Buchleitner, and Thomas Wellens — Physikalisches Institut, Albert-Ludwigs-Universität Freiburg

Upconversion materials, which convert two low-energy photons into one photon with higher energy, in combination with photonic structures, open promising possibilities to improve the efficiency of silicon solar cells by utilising the full range of the solar spectrum [1].

By tuning the thickness of each individual layer in a multi-layered photonic structure, we show that it is possible to trap incident photons of a given wavelenght inside this structure, and thus considerably increase the local irradiance in those layers which contain the upconverter material. We compare the achievable enhancement of the local irradiance, as well as its robustness under manufactoring errors, as obtained for the resulting optimal geometries to thus far experimentally implemented [1] Bragg structures.

[1] C. L. M. Hofmann, B. Herter, S. Fischer, J. Gutmann, and J. C. Goldschmidt, Upconversion in a Bragg structure: photonic effects of a modified local density of states and irradiance on luminescence and upconversion quantum yield, Opt. Express 24, 14895-14914 (2016)