Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.656
Publication date: 16th December 2024
<p>Bulk-heterojunctions (BHJs) comprising mixed phases of donor and acceptor organic semiconductors have propelled the performance of organic photovoltaics (OPVs) and organic photodetecors (OPDs) to performances closing in on those of competing technologies. However, poor control over interfaces and concerns over the long-term stability of such mixed phases mean that alternative architectures, such as bilayers or single-components, are re-gaining in research attention.</p> <p>Here, I will first present a simple and potentially low-cost hybrid organic/inorganic bilayer architecture for photodetectors and colour-tuneable solar cells, comprising the low-cost wide-bandgap inorganic semiconductor copper thiocyanate (CuSCN) and small-molecular acceptors. I will show that photodetectors using this simple bilayer can achieve an extremely low dark-current (10<sup>-8</sup> Acm<sup>-2</sup> @ -2V), which is partly enabled by low non-radiative voltage losses , and an extremely low noise spectral density [1]. Coupled with a light spectral respone that is widely tuneable through the choice of organic acceptor, this enables the fabrication of photodetectors with a specific detectivity in the near-infrared that approaches that of commerical Silicon photodetectors.</p> <p>Secondly, I will report on the characterisation and modelling of a variety of non-fullerene acceptors for single-component light-to-charge generation, which have been proposed to potentially offer a new avenue for opto-electronic devices. We combine experimental characterisation under varying conditions (field, temperature, excitation) with molecular and device-level calculations, to relate exciton and charge dissociation efficiency in single-component devices to molecular parameters, and investigate the potential of using free charge-generation in single organic semicondcutors for optoe-electronic devices.</p>
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