Cu₂ZnSnS₄ absorber layers deposited by spray pyrolysis for advanced photovoltaic technology

In this work, pneumatic spray pyrolysis was used to deposit Cu₂ZnSnS₄ kesterite thin film layers onto soda lime glass substrates/Mo coated substrates (substrate configuration). Furthermore, pneumatic spray pyrolysis was also tested as a potential way to grow kesterite thin film layers on ZnO nanorod arrays on SnO₂:F coated glass substrates (superstrate cell configuration). In this case semi-transparent samples were obtained. A summary of the process parameters optimization to effectively coat the ZnO nanostructures is presented. In both solar cell configurations, absorbers were selenized at 400-500°C and compared. For the substrate configuration, we present a device with a power conversion efficiency of 1.86%, V_oc = 292 mV, J_sc = 16.2 mA/cm² and FF = 39.6%. (Figure Presented).