We present flexible photodetectors (PDs) for visible wavelengths fabricated by stacking centimetre-scale chemical vapour deposited (CVD) single layer graphene (SLG) and single layer CVD MoS2, both wet transferred onto a flexible polyethylene terephthalate substrate. The operation mechanism relies on injection of photoexcited electrons from MoS2 to the SLG channel. The external responsivity is 45.5A/W and the internal 570A/W at 642nm. This is at least two orders of magnitude higher than bulk-semiconductor flexible membranes and other flexible PDs based on graphene and layered materials. The photoconductive gain is up to 4x10^5. The photocurrent is in the 0.1-100 uA range. The devices are semi-transparent, with just 8% absorption at 642nm and work stably upon bending to a curvature of 6cm. These capabilities and the low voltage operation (<1V) make them attractive for wearable applications.
翻译:我们对通过堆积厘米的化学蒸汽沉积(CVD)单层石墨(SLG)和单层的CVD MoS2 所制造的可见波长的柔性光检测器(PDs),两者均被湿转移到一个柔性聚乙烯聚乙烯的特雷发拉特基底质。操作机制依赖于从MOS2向SLG频道注入光解电子。外部响应率为45.5A/W,642nm为内部570A/W。这至少比基于石墨和层材料的散装半导体软膜和其他柔性PD高出两个数量级。光导增量高达4x10+5。光导增量在0.1-100uA范围内。这些设备是半透明,在642nm时只有8%的吸收量,在弯曲向6cm时工作时有刺力。这些能力和低电压操作( < 1V)使其对可磨损应用具有吸引力。