Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
DOI: https://doi.org/10.29363/nanoge.nfm.2022.085
Publication date: 11th July 2022
The major fill factor loss in organic solar cells is caused by the transport resistance, which arises due to low effective conductivity in these systems. Until recently, this loss mechanism has received little experimental attention, hence is not yet well understood. Using the temperature and illumination intensity dependent Suns-Voc and current-voltage measurements, we have determined the effective conductivity in a set of organic donor-acceptor systems, such as solution processed fullerene and non-fullerene acceptor devices, along with thermally evaporated solar cells based on small molecules. We show that the temperature dependence of the conductivity in these solar cells is closely related to the ideality factor. Furthermore, we demonstrate that the transport resistance can be described analytically in the framework of the multiple trapping and release model. Consequently, the shape of the energetic distribution of localised states, determined from the temperature dependence of the ideality factor, plays a key role in understanding the fill factor losses in organic solar cells.
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