Abstract
High performance, low cost, selective surfaces which are chemically and thermally stable are a key limiting problem in the development of the thermal applications of solar energy. This review deals with selective coatings that withstand high temperatures. After indicating the comparative advantages of selective over black-body absorbers, the different ways of generating selectivity are briefly investigated. The physicochemical requirements that must be met, in addition to the specific optical properties that are needed, are established, and criteria for the choice of materials are given. Finally several examples of selective surfaces are described and some trends for further research in the field are discussed.
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