Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.285
Publication date: 18th December 2023
Semi-transparent organic photovoltaics are potential candidates for making smart windows in buildings and for agrivoltaics. The challenge here is to achieve high light utilization efficiency (LUE) without compromising on average visible transmittance (AVT). In this work, we designed and fabricated selective spectral tuned Distributed Bragg Reflectors (DBR) using alternating layers of TiO2 and SiO2, high and low refractive index oxide materials. The reactive sputtered layers on the back side of a pre-coated ITO glass exhibited close to 90% reflection between 650nm to 900nm wavelength range (near infra-red) with an outstanding AVT of around 90%. To test the superiority of these DBR integrated substrates for organic photovoltaics, we first optimized fully slot die coated organic solar cells to achieve above 14% PCE with blend PM6:Y7 systems using an opaque device configuration. Following that, the DBR integrated semi-transparent devices are made with blend PM6:Y7 and AgNWs top transparent electrodes, fully slot die coated. The resulting solar cells show 20% improvement in current density Jsc from the DBR substrates, compared to devices without integrated DBR, and LUE values above 3%, with an AVT around 40% and PCE around 8.3%. These results show the potential of achieving improved semi-transparent photovoltaics with industrial compatible printing processes.
2020 CITYSOLAR, Interreg 5A RollFlex
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