Online  /  18. September 2023  -  22. September 2023

40th European Photovoltaic Solar Energy Conference and Exhibition PVSEC

Die EU PVSEC ist die größte internationale Fachkonferenz für Photovoltaik in den Bereichen Forschung, Technologien und Anwendungen in der Vertreter der Photovoltaik-Industrie ihre Technologien, Innovationen und neuen Konzepte präsentieren. Dr. Volker Sittinger, Leiter der Abteilung Diamantbasierte Systeme und CleanTech des Fraunhofer IST präsentiert seine aktuellen Forschungsergebnisse im Bereich der Photovoltaik:


»Development of indium zinc oxide TCOs films deposited from a metallic tube target for perovskite-silicon tandem solar cell applications«



This work focuses on the development and optimization of indium zinc oxide (IZO) as top transparent conductive oxide (TCO) for use in perovskite-silicon tandem solar cells. The indium zinc oxide films were produced by means of a reactive sputtering process with indium zinc alloy rotatable target with 96/4 weight percent. The coatings were produced on a large area in-line coater (1 m x 0.6 m) to demonstrate the process capability for industrial application. The indium/zinc rotatable target was sputtered with argon as sputter gas, and oxygen as reactive gas. The layer preparation was done with a lambda sensor to keep the oxygen partial pressure constant during the process. The IZO films were optimized for conductivity, carrier mobility and absorption. The measured absorption of the films was weighted with global standard spectral data (AM1.5G) in order to more closely mimic the effect of absorption on the resulting solar cell efficiency. The optimized IZO films will then deposited onto perovskite-silicon tandem cells where the power conversion efficiencies (PCE), short-circuit current densities (Jsc), open-circuit voltages (Voc), and fill factors (FF) were characterized and compared with tandem cells with a reference ITO as top TCO.