Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.203
Publication date: 7th February 2022
Single-component organic solar cells (SCOSCs) have witnessed great improvement during the last few years with the champion efficiency jumping from the previous 2-3% to currently 6-11% for the representative material classes. However, the photophysics in many of these materials has not been sufficiently investigated, lacking essential information regarding charge carrier dynamics as a function of microstructure, which is highly demanded for a better understanding and potential guidance to further improvements.
In this work, for the first time, the charge carrier dynamics on different time scales of a representative double-cable polymer, which achieves efficiencies of over 6% as an active layer in SCOSCs, has been investigated across 7 orders of magnitude in time scale, from fs-ps TAS and ps-ns TRPL for probing charge generation to ns-µs TAS for charge recombination. Specific emphasis is placed on understanding the evolution of charge generation, transport as well as charge recombination behind the gradually improved photovoltaic performance upon thermal annealing treatment of the representative double-cable polymer PBDBPBI-Cl. By increasing the thermal annealing temperature, geminate recombination is reduced accompanied by more efficient charge dissociation and suppressed bimolecular recombination. Annealing the photoactive layer at 230 oC results in the highest photovoltaic performance correlating well with the findings from transient studies. This work successfully presents a complete picture of the charge carrier dynamics in SCOSCs.
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