Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.443
Publication date: 16th December 2024
The power conversion efficiency of organic photovoltaics (OPV) has recently crossed the 20% milestone, placing an even larger focus on degradation processes and device stability. Here, recent results on oxide-organic as well as 2D MXene-organic interfaces in scalable OPV will be presented. Transition metal oxides serve as efficient charge carrier selective interlayers for electron and hole extraction in organic photovoltaic devices. However, interlayer related instabilities have been reported as a degradation route for high performing non-fullerene acceptor OPV devices, making a thorough understanding of such interfaces important for the further development of OPV technology. Recent progress made within sputtered oxide charge extraction and transport interlayers for OPV devices will be presented. Supported by a variety of surface science characterization techniques, the effect of e.g. oxide composition, microstructure and defect states on the performance of sputtered oxide interlayers in organic photovoltaic devices will be discussed [1,2]. In addition, the use of 2D MXene to tune interfaces between active layers and transport layers in OPV will be presented [3], demonstrating how such 2D layers can be employed to passivate interface defect states, and from that improve efficiency and in particular device stability. Finally, routes for Roll-to-Roll (R2R) up-scaling and manufacturing of OPV will be presented. This includes development of the hybrid interfaces using industrial-compatible Sheet-to-Sheet (S2S) and R2R techniques, and the scale up from cells to modules using various device configurations. This part also includes examples on development of scalable transparent tandem solar modules reaching power conversion efficiencies of 12.3% for an average visible transmittance of 30%, developed in the EU project CITYSOLAR.
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