A demonstration façade, composed of transparent PV windows produced by Sunpartner Technologies, has recently been created in the framework of the Interreg project “PV OpMaat”. In this project, a consortium of companies among which Eigenergie.net, NBArchitecten, TGM, Insulation Solutions and Isover work together with SEAC and Solliance on innovative PV solutions for the building industry. The window glass is coated with CIGS, a widely-used thin film PV material. In order to make the window transparent, the CIGS material has been structured with tiny holes, small enough to guarantee a uniform appearance to the human eye.
This technique allows to make very transparent and uniform window glass while still capturing a substantial part of the incident light to generate electricity. The density and the size of the holes also allow to tune the level of transparency.
PV windows are ideal for replacing the traditional glass modules in façades of office buildings. As such they can make a substantial contribution to the energy balance of such office buildings without changing the appearance of the building and without hampering the view from within the building.