Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
DOI: https://doi.org/10.29363/nanoge.nfm.2022.092
Publication date: 11th July 2022
Organic semiconductor-based photovoltaic (OPV) devices have many advantageous properties including tailorable light absorption, low embodied energy manufacturing, structural conformality, and low material toxicity. Apart from outdoor solar energy harvesting, these properties also make OPVs attractive for indoor applications which operate at considerably lower light intensities. However, owing to their low charge carrier mobilities, the competition between charge carrier extraction and recombination is an important factor limiting the performance of OPV devices [1]. This competition is known to be strongly dependent on both the applied voltage and the prevailing light intensity, however, the role of the contacts has remained elusive [2],[3]. In this work, we investigate processes limiting the collection of photogenerated charge carriers in OPV devices. We derive analytical expressions describing the current-voltage characteristics of thin-film devices based on low-mobility semiconductors at different light intensity conditions. The theoretical framework is further substantiated by numerical drift-diffusion simulations. Based on these findings, the light intensity and voltage dependence of the photogenerated current, and the impact of different loss mechanisms and contact-related effects, in OPV devices is clarified. This work provides intriguing insights into the differences between OPV devices operating under indoor and outdoor conditions.
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