Call | Solar-ERANET
Website | https://bobtandem.wordpress.com/
Coordinator |GeePs
Partner | ISC Konstanz, EPFL, Delft University of Technology, EDF
Starting date & duration | 2019, 36 months
Abstract | (4T) designs have yielded the best results but suffer challenges due to tunnel junctions (2T), grid alignment and interconnection (4T). The BOBTANDEM project proposes a new three terminal selective band offset barrier tandem integrating a high bandgap perovskite solar cell (PSC) on an interdigitated back contact cell (IBC). It uses a selective bandoffset barrier which prevents majority carrier transport from the high bandgap cell to the lower bandgap cell, while allowing minority carriers to be collected. This yields tandem efficiencies without tunnel junctions and grid alignment issues. The result is the collection of current at different potentials from top and bottom bandgap cells, as shown by decoupled quasi-Fermi level separations in top and bottom cells. The project includes leading researchers at the origin of the PSC concept, and leading IBC industrial partners managing mass production of the ZEBRA IBC cell in 2019. These are brought together with the recently patented SBOB concept which has been independently demonstrated in the field of infra-red detectors. These strong industrially validated IBC and SBOB conceptsyield a novel 35% efficient tandem devicewithout the limitation of tunnel junctions, and without the complex optical interconnection issues of 4T designs.
