TubeSolar and ZSW reach milestone on the way to industrializing flexible perovskite solar cells

TubeSolar, together with the Centre for Solar Energy and Hydrogen Research Baden-Württemberg (ZSW), has reached an important milestone on the way to industrial production of its novel photovoltaic technology: an efficiency record of 14% was achieved on solar films in the industrially suitable "roll-to-roll" process. This was achieved as part of TubeSolar's perovskite research activities. 

In the process, the partners deposited all layers - with the exception of the front and rear contacts - using slot die. The speed of the coating process was over one metre per minute. The combination of this industrially suitable, fast production process and the high efficiency was referred to as 'groundbreaking' by the Companies. The flexible solar cells are used for the production of tubular photovoltaic modules, which can be used in agri-photovoltaics, among other applications.


The partners' objective is to transfer the high efficiencies currently achieved in research on small areas to larger solar films and thus to commercialize slot die deposition as an industrially suitable coating method for flexible perovskite solar cells. By further optimizing the solar cell layer stack and the absorber, as well as the conductivity of the electrodes, the technology can be significantly improved even further.

The use of perovskite cells planned by TubeSolar should lead to an increase in the efficiency of the tubular photovoltaic (PV) modules and at the same time significantly reduce the production costs of the PV films and thus of the modules as a whole.

The benefits of TubeSolar's tubular photovoltaic modules - the combination of agricultural use (agri-photovoltaics) or a green roof and other functions of building surfaces ("green building") with the simultaneous generation of electricity on the same surface - can be further improved by the use of perovskite solar cells. Ideally, perovskite technology should already be used as part of the upscaling of highly automated mass production in the coming year.

In September 2021, Ascent Solar Technologies, a developer and manufacturer of flexible thin-film photovoltaic solutions, announced the signing of a Joint Development Agreement with German agrivoltaic thin-film solar tube maker, TubeSolar, to pursue the Agricultural-photovoltaics/Agrivoltaics (APV) market. The collaboration included joint development efforts in next generation, high efficiency CIGS-Perovskite tandem PV cells.

Posted: Jul 18,2022 by Roni Peleg