Proceedings of Online International Conference on Hybrid and Organic Photovoltaics (OnlineHOPV20)
Publication date: 22nd May 2020
Semitransparent organic photovoltaics (OPV) have unique properties for niche applications in the so-called building-integrated photovoltaics (BIPV) that require transparency such as windows or glazings. Moderate levels of transparency were traditionally achieved by implementing non-opaque electrodes and thin photoactive layers, thus limiting the light-harvesting capacity. The deposition of such semitransparent electrodes generally requires an evaporation step, thus increasing the device price. As a cost-effective alternative to boost simultaneously the efficiency and transparency of OPV modules, solution-processed electrodes and near inferred absorber photoactive materials are employed nowadays. In this work [1], we combine two commercial OPV materials, the blue low-bandgap polymer PBTZT-stat-BDTT-8 with the near-infrared absorbing non-fullerene acceptor 4TICO. Furthermore, semitransparent devices are upscaled from mm2-size single-cells to cm2 modules, following manufacturing processes that are fully compatible with large-scale productionand with the printing industry regulations. Our prototypes of semitransparent laser-patterned OPV modules exceed 30% of transparency and yield efficiencies in the range of 4%, geometrical fill factors surpassing 90% and an active area above 1 cm2. We verify the quality of cell-to-cell interconnection and optimise the geometry of the modules with the help of local optoelectronic imaging techniques.
This work was supported by the Spanish Ministerio de Economía y Competitividad (MINECO) under Grant PGC2018-095411-B-I00 and No. SEV-2015-0496 in the framework of the Spanish Severo Ochoa Centre of Excellence and by EURECAT Technological Centre. We acknowledge financial support from European Research Council through project ERC CoG 648901 and H2020 Marie Curie actions through the SEPOMO project (Grant number 722651).
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