A single dopant molecule can exchange more than one charge with the hosting polymer semiconductor, doubling the maximum doping efficiency achievable.
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Lüssem, B. Beyond 100% doping efficiency. Nature Mater 18, 93–94 (2019). https://doi.org/10.1038/s41563-018-0266-3
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DOI: https://doi.org/10.1038/s41563-018-0266-3
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