Reflection layer system for solar applications and method for the production thereof

Abstract

The invention relates to a reflection layer system RSS and to a method for the production thereof for front-surface mirrors for solar applications, comprising a layer that is highly reflective in the solar spectrum on a substrate S. In order to achieve such a reflection layer system RSS on curved and flat substrates S while keeping the use of material low and obtaining higher TSR values, deposited on the substrate S are a metallic, reflective functional layer F, a metallic reflective layer R, and a transparent, dielectric protective layer as a top layer D, which contains an oxide, nitride or oxynitride of a metal or semiconductor and the thickness of which is 500 nm or more, preferably more than 1 [mu]m.

Description

technical field [0001] The invention relates to a reflective layer system for front side mirrors for solar applications, having a layer highly reflective in the solar spectrum and deposited on a substrate. The invention also relates to a method for producing a reflective layer system. Background technique [0002] Reflective layer systems have long been used in many areas of our life; however, they are becoming more and more important today, eg for mirrors used to solve energy problems. Whereas mirrors for conventional indoor applications need to reflect "only" the visible part of the spectrum, for solar applications they must reflect as much as possible the entire range of the solar spectrum. [0003] As for the mirrors, depending on which side of the substrate the main reflection takes place, a distinction is generally made here between front-side mirrors and rear-side mirrors. [0004] Reflective layer systems are produced for indoor and outdoor applications such as sol...

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Problems solved by technology

[0009] In known systems, the thickness of the applied silver is between about 120nm and 150nm, silver being important for reflection but also a cost-intensive material, resulting in relatively high material costs

Furthermore, in the case of curved substrates, for example, the phenomenon that during the wet-chemical coating of the convex surface of the substrate initially the liquid silver and / or copper solution flows due to gravity to the edge of the substrate and produces a higher layer thickness there, For silver, the layer thickness is often in the range of, for example, 150 nm

This effect significantly increases the amount of material used and leads to layer thickness inhomogeneities, which cannot be tolerated for many applications at this order of magnitude

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