A grey body emitter based on a microcavity array with Pt-heater on the backside is presented. The microcavity array is made by electro-chemical etching of silicon. It has been shown in a previous work, that this emitter has especially in the spectral region >8 μm significantly higher emissivity than commercial available emitters. Due to the thin-film technology of MEMS-based emitters, these types can be typically operated with a maximum temperature of 700°C to 800°C. Higher temperature causes degradation of the heater. But higher temperatures also mean an enhancement in radiation power and thus open a wider area of application. The presented work shows a temperature enhanced thermal emitter with a ceramic heater passivation. Short time tests show the possibility of a maximum temperature of 1000°C. The part of light emitted by the microcavities in comparison to the whole device as well as the influence of the pore size concerning the emitted spectral range is investigated. The results are the basis for a redesign of the microcavity array for an enhancement of the geometry tuned emissivity.© (2008) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.