Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
DOI: https://doi.org/10.29363/nanoge.nfm.2022.183
Publication date: 11th July 2022
Organic solar cells utilize an energy-level offset between the electron donor and acceptor material to generate free charge carriers. The offset provides the driving force to overcome the Coulomb attraction of the initially formed bound electron-hole pair (exciton). However, this driving force constitutes an internal energy loss. To maximize the open circuit voltage and the short circuit current at the same time, the necessary driving force must be pushed to a minimum without penalizing the free carrier yield. We have shown that in donor-acceptor systems with small driving force for charge separation, a Boltzmann stationary state equilibrium causes a residual population of excitons of the lower bandgap material throughout their lifetime [1]. This highlights the importance of minimizing nonradiative recombination in the pristine non-fullerene acceptor materials.
Recently, several groups, including us, have demonstrated barrierless separation of the coulombically bound intermediate charge transfer state into free charge carriers. We show that if neutral and charged excitations are in a Boltzmann equilibrium, there is an optimum energy of the charge transfer state to maximize both open circuit voltage and short circuit currents [2].
Finally, we will report on recent progress to understand and control electrical performance loss in organic solar cells, and to fine control and interrogate the energetics and dynamics at the interface between donor materials and non-fullerene acceptors.
We acknowledge funding by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) – Projektnummer 182849149 – SFB 953, through the “Aufbruch Bayern” initiative of the state of Bavaria (EnCN and SFF) and the Bavarian Initiative “Solar Technologies go Hybrid” (SolTech) and funding from DFG project DFG INST 90/917 and BR 4031/21-1 . We also acknowledge funding from the European Union’s Horizon 2020 research and innovation programme under grant agreements No 761112 (PRESTIGE) and No 820789 (OLEDSOLAR).
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