▎ 摘　　要

TiO2-graphene (TGR) nanocomposites with varying concentrations of graphene from 0 to 1 wt% were prepared by direct mix method. X-ray diffraction (XRD) spectra confirmed the incorporation of graphene in photoanode material, which was further supported by field emission scanning electron microscopy (FESEM) and energy dispersive X-ray (EDX). The UV-visible spectrum of these nanocomposites shifted towards higher wavelength region as compared to pure TiO2 that indicated a reduced band gap and hence, enhanced absorption bandwidth. Significant reduction in electron-hole recombination was confirmed from photoluminescence spectroscopy. These TGR nanocomposite films after tethering with black dye were employed as photoanodes in dye-sensitized solar cells (DSSCs). The efficiency of solar cells at varying concentrations of graphene (in photoandes) was also investigated. TGR 0.25 wt% nanocomposite showed the highest photocurrent density (J(SC)) of 18.4 mA cm(-2) and efficiency (eta) of 4.69%.