Journal
ADVANCED ENERGY MATERIALS
Volume 11, Issue 31, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202101338
Keywords
charge dynamics; charge recombination; energy loss; fill factor; ternary organic solar cells
Categories
Funding
- National Natural Science Foundation of China [21875067, 51811530011, 51773045, 21772030, 51922032, 21961160720]
- Fundamental Research Funds for the Central Universities, Shanghai Rising-Star [19QA1403100]
- East China Normal University Multifunctional Platform for Innovation
- National Key Research and Development Program of China [2017YFA0206600]
- open project of State Key Laboratory of Luminescent Materials and Devices [2021-skllmd-07]
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Ternary architecture shows potential in enhancing power conversion efficiencies of organic solar cells, with the fill factor generally below 78%. Studies indicate that effective exciton dissociation, enhanced charge transport, and suppressed recombination are crucial for achieving high-fill factor and low-energy loss in ternary cells.
Ternary architecture is a promising strategy to enhance power conversion efficiencies (PCEs) of organic solar cells (OSCs). However, among all the photovoltaic parameters that govern the final PCEs, the fill factor (FF) for ternary OSCs is generally below 78%, limiting solar cells' performance. Here, charge dynamics in the ternary cells PM6:DRTB-T-C4:Y6 with a FF of 80.88% and a PCE of 17.05% are thoroughly investigated by a series of transient characterization technologies, including transient absorption spectroscopy, transient photovoltage, and transient photocurrent measurements. The impressive FF results from effective exciton dissociation, enhanced charge transport and suppressed recombination in ternary cells. Moreover, the correlation between the measured FF and the charge recombination-extraction competition is quantitatively analyzed by using a circuit model. The ternary cells also show small energy loss (E-loss). The findings here provide insight into achieving high-FF and low-E-loss ternary OSCs.
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