Organic solar cells hold the potential for integration into building facades and windows, due to their optical translucency and ability to be manufactured on large areas at high-throughput. The efficiency of organic solar cells is less dependent on the intensity and the angle of the incoming light; however, to become a relevant industrial solution, upscaling towards an industrial process is necessary, as is a further increase in performance and longer lifetime.
Imec’s research program on organic solar cells tackles all the challenges to make the organic photovoltaic technology ready for market introduction. Imec developed a dedicated inverted bulk heterojunction architecture for polymer-based solar cells. This architecture simultaneously optimizes cell light management and increases device stability. After demonstrating excellent efficiency results at the cell level in 2011, imec and Solvay developed a process to integrate inverted bulk heterojunction solar cells in an efficient module that uses 95 percent of the aperture area to generate electricity. A module efficiency as high as 5.5 percent on a 16cm² aperture area was achieved, a world-record for organic photovoltaic modules.
Tom Aernouts, R&D group leader of organic photovoltaics at imec, noted:
“We are excited to have achieved these excellent results at module level. They are an important step towards upscaling organic solar cell technology to high-volume production. With further device and module structure optimizations and optimization of the photo-active material of the cell, we will continue increasing efficiency and lifetime, which are essential advancements for developing an industry-relevant technology for organic solar cells.”
Imec’s organic photovoltaics activities are currently part of Solliance, a cross-border R&D cluster that leverages the know-how of key players in thin film solar energy technology in the Eindhoven-Leuven-Aachen triangle to strengthen the position of the region as a world player in thin film photovoltaics.