Field effect transistors (FETs) based on 2D materials are of great interest for applications in ultrathin electronic and sensing devices. Here we demonstrate the possibility to add optical switchability to graphene FETs (GFET) by functionalizing the graphene channel with optically switchable azobenzene molecules. The azobenzene molecules were incorporated to the GFET channel by building a van der Waals heterostructure with a carbon nanomembrane (CNM), which is used as a molecular interposer to attach the azobenzene molecules. Under exposure with 365 nm and 455 nm light, azobenzene molecules transition between cis and trans molecular conformations, respectively, resulting in a switching of the molecular dipole moment. Thus, the effective electric field acting on the GFET channel is tuned by optical stimulation and the carrier density is modulated.

中文翻译：

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化学功能化石墨烯场效应晶体管中电荷载流子密度的光触发控制。

基于2D材料的场效应晶体管（FET）在超薄电子和传感设备中的应用引起了极大的兴趣。在这里，我们展示了通过使用可光学转换的偶氮苯分子功能化石墨烯通道，为石墨烯FET（GFET）添加光学转换能力的可能性。通过用碳纳米膜（CNM）建立范德华异质结构，将偶氮苯分子结合到GFET通道中，碳纳米膜（CNM）用作分子插入物以连接偶氮苯分子。在365 nm和455 nm的光照射下，偶氮苯分子分别在顺式和反式分子构象之间转变，从而导致分子偶极矩的切换。因此，作用在GFET通道上的有效电场可通过光刺激进行调整，并调制载流子密度。