The high efficiency offered by tandem PV contributes to reducing overall PV system costs, and is important to reduce the area required for PV power generation. Both aspects support the transition to a society using primarily renewable energy.
The international technology roadmap for photovoltaics (ITRPV) foresees that tandem PV based on crystalline silicon (c-Si) will make rapid progress towards industrial implementation, and will have obtained a significant market share by 2025. Because of the limited available area for PV and importance of rooftop PV, tandem PV is very suitable for the Netherlands.
Hybrid organic-inorganic perovskite thin film solar cells are the primary candidate technology to be paired with c-Si to construct the tandem, while other candidates are also under investigation. Research organization Solliance, in which TNO participates, executes an industrial shared research program on perovskite PV technology. ECN part of TNO together with academic and industrial partners combines the perovskite thin film technology with c-Si technology to create tandem cells and modules. So far an efficiency gain of 5 percentage points over typical industrial c-Si cells was achieved. ECN part of TNO expects to begin small scale module outdoor tests in 2018. Solliance also looks into fully thin-film-based tandem PV technologies, such as perovskite combined with CIGS.
Based on its know-how spanning the entire production chain from solar cell to PV system, ECN part of TNO can provide support and cooperation on topics such as: