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Three-dimensional metallo-dielectric selective thermal emitters with high-temperature stability for thermophotovoltaic applications
Garin Escriva, Moises; Hernández García, David; Todorov Trifonov, Trifon; Alcubilla González, Ramón
Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica; Universitat Politècnica de Catalunya. MNT - Grup de Recerca en Micro i Nanotecnologies
Selective thermal emitters concentrate most of their spontaneous emission in a spectral band much narrower than a blackbody. When used in a thermophovoltaic energy conversion system, they become key elements defining both its overall system efficiency and output power. Selective emitters' radiation spectra must be designed to match their accompanying photocell's band gap and simultaneously, withstand high temperatures (above 1000 K) for long operation times. The advent of nanophotonics has allowed the engineering of very selective emitters and absorbers; however, thermal stability remains a challenge since nanostructures become unstable at temperatures much below the melting point of the used materials. In this paper we explore a hybrid 3D dielectric-metallic structure that combines the higher thermal stability of a monocrystalline 3D silicon scaffold with the optical properties of a thin platinum film conformally deposited on top. We show experimentally that these structures exhibit a selective emission spectrum suitable for TPV applications and that they are thermally stable at temperatures up to 1100 K. These structures are ideal in combination with HI-V semiconductors in the range E-g=0.4-0.55 eV such as InGaAsSb (E-g=0.5-0.6 eV) and InAsSbP (E-g=0.3-0.55 eV). (C) 2014 Elsevier B.V. All rights reserved.
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria electrònica::Microelectrònica
Àrees temàtiques de la UPC::Física::Electromagnetisme::Conductivitat
Àrees temàtiques de la UPC::Enginyeria electrònica::Optoelectrònica::Fotodetectors
Nanoelectronics
Photovoltaic power generation
Selective thermal emitters
Thermophotovoltaics
Photonic crystals
Macroporous silicon
MACROPOROUS SILICON
PHOTONIC CRYSTALS
SURFACE
EMISSION
RADIATION
PHYSICS
Nanoelectrònica
Energia solar fotovoltaica
info:eu-repo/semantics/submittedVersion
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