Tang Zian, George Antony, Winter Andreas, Kaiser David, Neumann Christof, Weimann Thomas, Turchanin Andrey
Institute of Physical Chemistry, Friedrich Schiller University Jena, Lessingstraße 10, 07743, Jena, Germany.
Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116, Braunschweig, Germany.
Chemistry. 2020 May 20;26(29):6473-6478. doi: 10.1002/chem.202000431. Epub 2020 Mar 27.
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.
基于二维材料的场效应晶体管（FET）在超薄电子和传感设备应用中备受关注。在此，我们展示了通过用可光开关的偶氮苯分子对石墨烯场效应晶体管（GFET）的石墨烯通道进行功能化，为其添加光开关特性的可能性。通过构建与碳纳米膜（CNM）的范德华异质结构，将偶氮苯分子引入到GFET通道中，碳纳米膜用作连接偶氮苯分子的分子插入层。在365纳米和455纳米光照射下，偶氮苯分子分别在顺式和反式分子构象之间转变，导致分子偶极矩发生切换。因此，通过光刺激调节作用在GFET通道上的有效电场，并调制载流子密度。
