IMO-IMOMEC researchers develop perovskite-perovskite tandem photovoltaics with optimized bandgap. Oct 27, 2016
dr. ir. Bert CONINGS
Dr. ir. Bert Coning and drs. Aslihan Babayigit of the Nanostructure Physics (NSP) group headed by Prof. dr. Hans-Gerd Boyen together with British and american scientist succeeded to demonstrate four and two-terminal perovskite-perovskite tandem solar cells with ideally matched bandgaps. Their research is published in the magazine 'Science'.
Perovskites are a class of crystalline compounds that have garned much interest as efficient light harvesters, but also in applications such as light-emitting diodes, lasers and photodetectors, in view of their favourable intrinsic properties, such as ambipolarity, high charge-carrier mobilities, high diffusion lengths and high absorption coefficients. Brisk and impressive achievements have brought perovskite solar cells to a level near silicon photovoltaics in terms of efficiency.
These tandem solar cells absorb two parts of energy of the solar energy spectrum. in combination with a mechanically stacked four terminal setup, these solar cells reached a efficiency of 20.3%. Also important is the fact that their Perovskite solar cells setup exhibit an excellent thermal and atmospheric stability. This device architecture and materials set will enalbe all perovskite thin film solar cells to reach the highest efficiencies in the long term at the lowest cost.