ZnSb/Ti_(3)C_(2)T_(x)MXene van der Waals heterojunction for flexible near-infrared photodetector arrays

Two-dimension(2D)van der Waals heterojunction holds essential promise in achieving high-performance flexible near-infrared(NIR)photodetector.Here,we report the successful fabrication of ZnSb/Ti_(3)C_(2)T_(x)MXene based flexible NIR photodetector array via a facile photolithography technology.The single ZnSb/Ti_(3)C_(2)T_(x)photodetector exhibited a high light-to-dark current ratio of 4.98,fast response/recovery time(2.5/1.3 s)and excellent stability due to the tight connection between 2D ZnSb nanoplates and 2D Ti_(3)C_(2)T_(x)MXene nanoflakes,and the formed 2D van der Waals heterojunction.Thin polyethylene terephthalate(PET)substrate enables the ZnSb/Ti_(3)C_(2)T_(x)photodetector withstand bending such that stable photoelectrical properties with non-obvious change were maintained over 5000 bending cycles.Moreover,the ZnSb/Ti_(3)C_(2)T_(x)photodetectors were integrated into a 26×5 device array,realizing a NIR image sensing application.

Flexible Transparent Near-Infrared Photodetector Based on 2D Ti_(3)C_(2) MXene-Te Van Der Waals Heterostructures

Ti_(3)C_(2) MXe ne servi ng as superior electrical con ductors prese nts more specific performa nee such as tran spar ency,con ductivity tha n gold(Au),and even could form a heterostructure with active materials of the functional devices.Here,a Ti_(3)C_(2) MXene-Te microplate van der Waals heterostructure based tran spare nt near-i nfrared photodetector(PD)is exploited.

Low-Dimensional Nanostructure Based Flexible Photodetectors: Device Configuration, Functional Design, Integration, and Applications

CONSPECTUS:A flexible photodetector that extends unique capabilities such as deformation,adaptivity to a soft surface,mechanical stability,and high photoresponsivity compared to the rigid devices has come to prominence in telecommunication,remote sensing,medical diagnostics,image sensing,optical communication,and the biomimetic human visual system.Low-dimensional nanomaterials consisting of one-dimensional(1D)nanowires(NWs),2D nanoplates,and heterojunctions such as quantum dot modified NWs,hierarchical 1D hybrid nanomaterials,1D/2D composites,2D/2D heterostructures,etc.are considered as promising photosensitive materials in designing a flexible photodetector owing to the large surface to volume ratio and mechanical suppleness along the growth direction of the 1D NWs,excellent mechanical strength,superior structural stability,fast electron mobility,and low power dissipation of 2D nanoplates,and the synergistic effect of the heterojunctions.In this Account,we present our recent progress on low-dimensional nanostructure based flexible photodetectors.First,the three components,including the soft substrate,conductive electrodes,and representative lowdimensional nanomaterials(1D NWs,2D nanoplates,and various types of heterojunctions)required for achieving flexible photodetector are summarized.Then,the design strategies toward functional photodetectors are presented in terms of their flexibility,stretchability,transparency,and photodetector with tunable photoresponse properties.The integration concepts of the photodetector with flexible energy storage to realize independent detectivity and the field effect transistor to amplify the responsivity are also provided.Furthermore,the application examples of the flexible photodetector in the artificial visual memory system and the biomimetic eye are reviewed.Finally,we discuss the future prospects of the low-dimensional nanostructure based flexible photodetector in the field of flexible image sensing and integrated electronics.