Flexible facade and roof elements with switchable total energy transmittance (g-value)

Research Question

The aim of the FLEX-G joint project from the BMWi's EnergieWendeBauen funding line is to research technologies for the production of translucent and transparent roof and facade elements with integrated optoelectronic components.


The focus is a switchable total energy transmittance (g-value). This is achieved by electrochromic components, which are built up directly on a flexible ETFE foil by roll-to-roll coating processes. ETFE is a foil material frequently used in membrane roofs of stadiums, airports or railway stations. A second project goal is the research of technologies for the direct integration of large-area flexible solar cells based on organic photovoltaics in ETFE membranes and the adaptation of these to specific membrane construction requirements.

Targeted results

The FLEX-G project thus makes a significant contribution to the German government's goal of reducing primary energy requirements in Germany by 50 % by 2050, both in the area of energy saving and in the area of energy generation in buildings.

ManagementProf. Dr.-Ing. Jan Cremers
Partnervarious partners from research and industry
SponsorBundesministerium für Wirtschaft und Energie (BMWi)
Duration01.06.2017–31.05.2020 extended until 30.11.20


Name & Position E-Mail & Telephone
Architekt, Professor, Dekan+49 711 8926 2620 8/2.01
Akademischer Mitarbeiter+49 711 8926 2451 4/307