Radiating surfaces at typical temperatures in the range of 1200-2000 K are the source of energy which is incident on the TPV cells of TPV systems. The radiators or emitters may have very pronounced or weak spectrally selective properties on which TPV system efficiencies depend very much. This paper gives an overview of existing emitter technologies. Two different approaches to realize spectrally selective emitters are discussed in detail: rare-earth oxides and engineered tungsten emitters.
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