Metal-insulator-metal selective emitter design with an emissivity matching with gasb thermophotovolatic cell

Date

2021-01-01

Author

Atak, Eslem Enis
Elçioğlu, Elif Begüm
Okutucu Özyurt, Hanife Tuba

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© 2021, Begell House Inc. All rights reserved.A thermophotovoltaic (TPV) system converts infrared radiation to electrical energy by means of the PV effect. For a TPV system to work efficiently, the emission spectrum of its emitter must match the energy bandgap (Eg) of its TPV cell. An ideal selective emitter emits in-band photons, i.e., photons with energy, E > Eg (thus λ 1.6 µm. Tungsten (W), with high emissivity in the visible and near infrared region is a suitable TPV emitter. Metamaterial structures consisting of W (base) and SiO2 (spacer) were also shown to be stable at high temperatures. In this work, a W-SiO2-W nano-patterned selective emitter is proposed by performing a finitedifference time-domain analysis. Grid search optimization is used to with an objective function constructed to maximize the average emissivity up to the cut-off wavelength of quantum efficiency of GaSb, and to minimize the emissivity after the bandgap of GaSb. The designed emitter has an average emissivity of 98.2% between 1.2-1.6 µm. At 1700 K, the ratio of in-band radiation to the total radiation emitted is calculated to be 72.3%. At the same temperature, this ratio is 27.9% for a standard SiC emitter.

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https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85118980960&origin=inward
https://hdl.handle.net/11511/99097

Conference Name

8th International Symposium on Advances in Computational Heat Transfer, CHT 2021

Collections

Department of Mechanical Engineering, Conference / Seminar

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Citation Formats

E. E. Atak, E. B. Elçioğlu, and H. T. Okutucu Özyurt, “Metal-insulator-metal selective emitter design with an emissivity matching with gasb thermophotovolatic cell,” presented at the 8th International Symposium on Advances in Computational Heat Transfer, CHT 2021, Virtual, Online, 2021, Accessed: 00, 2022. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85118980960&origin=inward.