Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.198
Publication date: 18th July 2023
Our in-house developed ITO-free organic photovoltaics (OPV) device stack proved to be well suited both for upscaling to larger area modules as well as for low-light applications as power source for the internet of things. It is based on a reflective (electron) metal back contact, followed by the absorber layer and a transparent (hole) front contact based on PEDOT:PSS with or without an Ag grid, depending on the requirements for the conductivity. With such devices, we were able to achieve efficiencies >15% under '1 sun' and up to more than 20% under cold white LED illumination with 500 lux. The solar cells designed for indoor usage were found to be extremely stable, with lifetimes deduced from accelerated ageing experiments of more than 100 years. Also under full sunlight the stability is very promising if a UV-filter is employed.
In order to achieve high visual transmission with our OPV devices we only had to replace the back electrode by thin Ag layers sandwiched between metal oxides. This type of electrode offers both high visual transparency and strong near infrared reflectivity and thus we were able to achieve promising values of 8.65% power conversion efficiency (PCE) at an average visual transmission (AVT) of 46.3%, giving rise to a light utilization efficiency (i.e., the product of PCE and AVT) of 4.0. This is amongst the highest values for semitransparent devices processed from non-halogenated solvents.
The optimization of these devices is based on thorough characterization complemented by optical and electrical simulations which shall be discussed in the talk.
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