Switchable Photoresponse Mechanisms Implemented in Single van der Waals Semiconductor/Metal Heterostructure
Mingde Du, Xiaoqi Cui, Hoon Hahn Yoon, Susobhan Das, Md Gius Uddin, Luojun Du, Diao Li, Zhipei Sun
Abstract
electrode under high forward bias. The switchable photoresponse mechanisms originate from the band alignment at the interface, where the band bending could be readily adjusted by the bias voltage. In addition, a conceptual optoelectronic logic gate is proposed based on the exclusive working mechanisms. Finally, the photodetection performance of this heterostructure is represented by an ultrahigh responsivity of ∼84 A/W to 532 nm laser. Our results demonstrate the valuable application of 2D metals in functional devices, as well as the potential of implementing photovoltaic device and phototransistor with single vdW heterostructure.
Topics & Concepts
HeterojunctionMaterials scienceOptoelectronicsRectificationPhotocurrentSemiconductorvan der Waals forceResponsivityPhotovoltaic effectSchottky barrierSchottky diodePhotodiodeDiodePhotovoltaic systemPhotodetectorVoltageChemistryPhysicsElectrical engineeringMoleculeEngineeringOrganic chemistryQuantum mechanics2D Materials and ApplicationsMXene and MAX Phase MaterialsTopological Materials and Phenomena