The encapsulation of graphene-based Hall sensors on foil is shown to be an effective method for improving the performance in terms of higher sensitivity for magnetic field detection. Two types of encapsulation were investigated: a simple encapsulation of graphene with polymethyl methacrylate (PMMA) as a proof of concept and an encapsulation with mechanically exfoliated hexagonal boron nitride (hBN). The Hall sensor with PMMA encapsulation already shows higher sensitivity compared to the one without encapsulation. However, the Hall sensor with graphene encapsulated between two stacks of hBN shows a current and a voltage normalized sensitivity of up to 2270 V/AT and 0.68 V/VT, respectively, which are the highest reported sensitivity values for Hall sensors on foil so far.
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机译：石墨烯基霍尔传感器在箔片上的封装被证明是一种提高性能的有效方法，可以提高磁场检测的灵敏度。研究了两种类型的封装：以聚甲基丙烯酸甲酯（PMMA）的简单石墨烯封装作为概念验证，以及机械剥落的六方氮化硼（hBN）的封装。与未封装的霍尔传感器相比，具有PMMA封装的霍尔传感器已经显示出更高的灵敏度。然而，在两层hBN之间封装了石墨烯的霍尔传感器的电流和电压归一化灵敏度分别高达2270 V / AT和0.68 V / VT，这是迄今为止箔上霍尔传感器的最高灵敏度值。 。
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