Photosensor Device Based on Few‐Layered WS 2 Films

Abstract Few‐layered films of WS 2 , synthesized by chemical vapor deposition on quartz, are successfully used as light sensors. The film samples are structurally characterized by Raman spectroscopy, atomic force microscopy, scanning electron microscopy, and high‐resolution transmission electron microscopy. The produced samples consist of few layered sheets possessing up to 10 layers. UV–visible absorbance spectra reveals absorption peaks at energies of 1.95 and 2.33 eV, consistent with the A and B excitons characteristic of WS 2 . Current–voltage ( I – V ) and photoresponse measurements carried out at room temperature are performed by connecting the WS 2 layered material with Au/Ti contacts. The photocurrent…