Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
DOI: https://doi.org/10.29363/nanoge.hopv.2023.191
Publication date: 30th March 2023
Although ternary blends (consisting of one host binary blend and one guest component) deliver record efficiencies for organic solar cells (OSCs), their performance still lags behind other next-generation photovoltaic technologies, mainly due to the significant voltage losses. The fundamental understanding of how the added guest component affects the open-circuit voltage (VOC ) in ternary organic solar cells (TOSCs) remains controversial, limiting the rational screening and/or design of the guest component. In this study, we systematically investigate the VOC of a series of TOSCs based on the detailed balanced principle and paint a comprehensive picture of how the guest component affects the radiative and non-radiative related parts of VOC in TOSCs. We highlight that the thermal population of charge-transfer and local exciton states provided by the guest component based binary system has a significant influence on the non-radiative voltage losses. Ultimately, we provide two design rules for enhancing the VOC in TOSCs: 1) high emission yield for the guest component based binary blend and similar charge-transfer state energies for the two binary blends; 2) high miscibility of the guest component with the low-optical-gap component in the host binary blend.
I thank all the co-authors for their contributions, including Jianwei Yu, Rui Zhang, Jun Yuan, Sandra Hultmark, Catherine E. Johnson, Nathaniel P. Gallop, Bernhard Siegmund, Deping Qian, Huotian Zhang, Yingping Zou, Martijn Kemerink, Artem A. Bakulin, Christian Müller, and Koen Vandewal. This research was supported by the Swedish Strategic Research Foundation through a Future Research Leader program to F.G. (FFL 18-0322), Swedish Research Council VR (grant nos. 2016-06146, 2018-06048, and 2019-00677), the Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linköping University (faculty grant no. SFO-Mat-LiU #2009-00971), the FWO (project G0B2718N), the European Research Council (ERC, grant agreement 864625), the Knut and Alice Wallenberg Foundation through the project “Mastering Morphology for Solution-borne Electronics”, Royal Society and Leverhulme Trust, and the New Faculty Start-up Grant of the City University of Hong Kong (7200709, 9610547).
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