Proceedings of 13th Conference on Hybrid and Organic Photovoltaics (HOPV21)
Publication date: 11th May 2021
In previous works, we have used ultrafast charge extraction and optical probes to show that photocreated charge carriers in typical OPV devices do not completely thermalize before extraction. After a short recap of these findings, we will show how the non-equilibrium nature of the charge carrier populations in OPV affects the open circuit voltage (Voc) and how the underlying slow thermalization can be rectified to boost Voc and the fill factor (FF).
Specifically, we experimentally calibrate a kinetic Monte Carlo model to reproduce temperature- and thickness-dependent jV-characteristics of both fullerene and non-fullerene OPV devices. This then allows us to assess the Voc gain that is associated with the incomplete thermalization, and we find gains of 0.1-0.2 V as compared to –hypothetical- OPV devices where thermalization does fully complete. In the second part of the talk, I will show how composition gradients can be used to rectify a significant fraction of the thermalization loss to boost Voc and FF and thereby the overall power conversion efficiency.
M. K. thanks the Carl Zeiss Foundation for financial support.
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