The asymmetry of electron–hole diffusion velocities in intrinsic graphene can give rise to efficient photocurrent generation.
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Yin, J., Peng, H. Asymmetry allows photocurrent in intrinsic graphene. Nature Nanotech 14, 105–106 (2019). https://doi.org/10.1038/s41565-019-0368-3
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DOI: https://doi.org/10.1038/s41565-019-0368-3