Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.577
Publication date: 16th December 2024
Despite having similar power conversion efficiency limits according to detailed balance, the performance of Y6 in organic photovoltaic blends still outshines that of its narrower bandgap derivatives, as shown in the TOC plot adapted from ref [1]. An understanding of the underlying mechanisms is needed to tap into the potential of low-bandgap non-fullerene acceptors (NFAs) for tandem applications and beyond. Thus motivated, we scrutinize two low-bandgap NFAs – BTPV-eF-eC9 and BTPV-4Cl-eC9 – in binary devices from the perspective of photocurrent generation, and resolve the losses incurred at each step between photon absorption and carrier extraction. With a combination of steady state and time-resolved optoelectronic techniques, we find that in these acceptors, the kinetic competition between charge-transfer state decay and its separation is a major limiting role in the overall photon harvesting capability of the devices. Despite having similar voltage losses as PM6:Y6, which we attribute to efficient charge-transfer formation at lower driving forces, the geminate loss pathway via the charge-transfer state curbs fill factor and photocurrent. This reinforces the notion that suppression of geminate loss pathways can vitally balance recombination losses with improved charge generation, and markedly move the overall internal quantum efficiency towards the detailed balance limit.
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