Abstract

Recently Ma et al. (Nature Nanotech. 14, 145, 2019) reported an intrinsic photocurrent in graphene, which occurs as the authors believe “in a different parameter regime from all the previously observed photothermoelectric or photovoltaic photocurrents in graphene”. Here we present an alternative – obvious and transparent explanation of such experiments. We demonstrate that the photo effect occurs in the p–n junctions formed in graphene samples containing two regions of different widths with different particle concentrations. This difference in concentration for various sample widths is found to result from edge doping of samples.

中文翻译：

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原始石墨烯中光电流的起源

摘要

最近Ma等。（自然纳米技术。 14，145，2019）报道了在石墨烯固有的光电流，而发生正如作者“在从所有的先前观察到的photothermoelectric或在石墨烯光伏光电流不同的参数政权”相信。在这里，我们提出了一种替代方法-对此类实验的明显且透明的解释。我们证明，光效应发生在石墨烯样品中形成的p - n结中，该石墨烯样品包含两个不同宽度和不同颗粒浓度的区域。发现各种样品宽度的浓度差异是由样品的边缘掺杂引起的。