Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.111
Publication date: 18th July 2023
The emergence of new organic semiconductors has driven the continuous development of organic solar cells, with the power conversion efficiency of single-junction devices having passed 19%. The strong intermolecular interactions between organic semiconductors lead to the self-assembly of them into hierarchical aggregates, which exhibits vastly different optoelectronic properties compared to those of the single molecules. Revealing and controlling the complex aggregation structure of organic semiconductors, and establishing the key relationship between structure and the power conversion process, is vitally important toward high performance organic solar cells, but remains as a grand challenge.
Dedicating to this field, we have developed a number of physical and chemical approaches to tune the hierarchical aggregates of organic photovoltaic molecules: We developed the heating-induced aggregation strategy to suppress the large-size aggregation of crystalline semiconductors, realizing the conversion from large-size aggregation to small aggregation, which broadens the light absorption range and enhances exciton splitting; we developed the solution-induced aggregation strategy, realizing the conversion from random aggregation to ordered aggregation, which increases the light absorption intensity and improves charge transport; we also developed the small-molecular fibrillization strategy, realizing the conversion from short-range aggregation to long-range aggregation, which resolves the serious charge recombination issue during charge hoping and achieves a device efficiency of over 19%. The correlation between aggregates and light absorption, exciton dissociation and charge transport processes is eventually established to direct the future development of organic solar cells.
This work is supported by the National Natural Science Foundation of China (52273196, 52073221 and 52203238).
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