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HL: Fachverband Halbleiterphysik

HL 33: Optical properties

HL 33.4: Vortrag

Dienstag, 17. März 2020, 14:45–15:00, POT 112

Selective emitters for thermophotovoltaics at 1400 °C — •Alexander Petrov^1,2, Manohar Chirumamilla¹, and Manfred Eich^1,3 — ¹Institute of Optical and Electronic Materials, Hamburg University of Technology, Hamburg, Germany — ²ITMO University, St. Petersburg, Russia — ³Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Geesthacht, Germany

In order to tailor thermophotovoltaic emitters to match specific photovoltaic receivers we demostrate spectrally selective emitters that have close to black body emission at short wavelengths and substantially reduced emission at long wavelengths. To emit significant power at the wavelengths usable for photovoltaic conversion (below 2 micron) the far-field emitter should be heated to high temperatures. The development of such thermally stable selective emitters requires strong cooperation between material science and optics, which was possible in the frame of the Hamburg based Collaborative Research Center SFB 986 "Tailor-made multiscale Materials Systems". We demonstrate selective band-edge emitters based on a W-HfO2 refractive metamaterial and a yttria stabilized ZrO2 opal monolayer on tungsten both stable up to 1400°C. The metamaterial exhibits almost angle independent selective emission due to a topological transition of its isofrequency surface. The monolayer approach, on the other hand, allows keeping the tungsten unstructured and thus demonstrates exceptional emission suppression at longer wavelengths. The physics behind the selective emission of the demonstrated concepts and an outlook for further improvement and enhanced thermal stability will be presented.