Belgian R&D and research hub Imec has achieved a record 24.6 % efficiency using a perovskite - based tandem copper indium gallium selenide ( CIGS ) solar cell . The perovskite cell used light from the visible spectrum and the CIGS layer captured the near - infra red light , increasing the cell 's performance compared to standalone cells . The company’s latest efficiency records are approaching that of U.K./Germany-based perovskite specialist, Oxford PV, which has hit 27.3% efficiency on a 1cm² tandem cell. The researchers added optical layers of layers to the cell stack , as well as optimising the transparent electrodes and the wide bandgap of 1.72eV. It achieved a 27.1 % efficiency from the team 's copper / silicon solar cell , which was announced in July .
Belgian R&D and research hub Imec has achieved a record 24.6 % efficiency using a perovskite - based tandem copper indium gallium selenide ( CIGS ) solar cell . The perovskite cell used light from the visible spectrum and the CIGS layer captured the near - infra red light , increasing the cell 's performance compared to standalone cells . The researchers added optical layers of layers to the cell stack , as well as optimising the transparent electrodes and the wide bandgap of 1.72eV. It achieved a 27.1 % efficiency from the team 's copper / silicon solar cell , which was announced in July .