▎ 摘　　要

Graphene nanoribbons (GNRs) are fine strips of unrolled carbon nanotubes (CNTs). GNRs overcome zero-bandgap limitations of graphene and hence can improve the overall performance of optical devices. GNRs possess width-dependent electrical and optical properties which can also be tuned for specific applications. In this work, GNRs of specific width were synthesized and structurally, morphologically, and optically characterized. The resulting GNRs were fabricated on Si/SiO2 substrate between silver interdigitated electrodes for photodetection applications. Depending upon the optical absorbance wavelength of GNRs, experiments were performed on the photodetectors using typical UV-Vis light of 390 nm, 405 nm, and 532 nm. The performance parameters, i.e. detectivity and responsivity, of the GNR/R-GNR-based photodetectors were measured. It was observed that for GNRs of 15 nm width, responsivity values of 0.37 mA/W, 0.16 mA/W, and 0.14 mA/W were found for wavelengths of 390 nm, 405 nm, and 532 nm, respectively, whereas values for GNRs of 10 nm width were 0.6 mA/W, 0.35 mA/W, and 0.45 mA/W for 390 nm, 405 nm, and 532 nm wavelengths, respectively. Similarly, detectivity for 10 nm GNRs was found to be double that of 15 nm GNRs. The response of the present photodetector was compared with values in earlier reports and was found to be superior.