Perpustakaan Digital ITB

Transition metal dichalcogenides (TMDs) area category of promising two-dimensional (2D) materials forthe optoelectronic devices, and their unique characteristicsinclude tunable band gap, nondangling bonds as well ascompatibility to large-scale fabrication, for instance, chemicalvapor deposition (CVD). MoS2is one of thefirst TMDs thatis well studied in the photodetection area widely. However,the low photoresponse restricts its applications in photo-detectors unless the device is applied with ultrahigh source?drain voltage (VDS) and gate voltage (VGS). In this work, the photoresponse of a MoS2photodetector was improved by achemicalin situdoping method using gold chloride hydrate. The responsivity and specific detectivity were increased to 99.9 A/W and 9.4×1012Jones under lowVDS(0.1 V) andVGS(0 V), which are 14.6 times and 4.8 times higher than those of a pristinephotodetector, respectively. The photoresponse enhancement results from chlorine n-type doping in CVD MoS2which reducesthe trapping of photoinduced electrons and promotes the photogating effect. This novel doping strategy leads to greatapplications of high-performance MoS2photodetectors potentially and opens a new avenue to enhance photoresponse for other2D materials