Proceedings of nanoGe Fall Meeting 2021 (NFM21)
DOI: https://doi.org/10.29363/nanoge.nfm.2021.040
Publication date: 23rd September 2021
Scaling effects of OPV devices for large-area solar cells and indoor applications
Gregory Burwell1, Wei Li1, Oskar J. Sandberg, Paul Meredith1, Ardalan Armin1
1Sustainable Advanced Materials (Sêr-SAM), Department of Physics, Swansea University, Singleton Park, Swansea SA2 8PP, United Kingdom
Abstract
Organic photovoltaic (OPV) devices have demonstrated steadily improving figures in merit in recent years, principally due to the development of non-fullerene acceptor (NFA)-based materials. However, superlative OPV devices are invariably lab-scale and small (< ~ 0.1 cm2) and it has proven challenging to replicate high power conversion efficiencies at practical sizes. At light intensities close to 1 Sun, the sheet resistance of available monolithic transparent conductive oxide (TCO) materials limits the performance of these larger devices. However, indoor OPV (IOPV) devices are required to operate at low light intensities, and thus demonstrate different area-scaling behavior. In contrast to 1 Sun operation, the performance of large-area IOPV devices are much less affected by the sheet resistances of transparent conductive electrodes, but instead by the shunt resistance, at low light intensities. In this work, we examine key parameters for improving the efficiency of large-area devices under different illumination regimes using drift-diffusion and finite element modeling. We examine application-specific device optimization of OPV devices for IOPV and standard 1 Sun operation reviewing aspects such as the transparent conductive electrode, material selection, and fabrication considerations.
This work was supported by the Welsh Government’s Sêr Cymru II Rising Star and Capacity Builder Accelerator Programs through the European Regional Development Fund, Welsh European Funding Office, and Swansea University Strategic Initiative in Sustainable Advanced Materials. A.A. is a Sêr Cymru II Rising Star Fellow and P.M.is a Sêr Cymru II National Research Chair. This work was also funded by UKRI through the EPSRC Program Grant EP/T028511/1 Application Targeted Integrated Photovoltaics.
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