▎ 摘　　要

Polyaniline-graphene quantum dots (PANI-GQDs) are considered as an important candidate for applications in photovoltaic cells. In this work, GQDs were prepared using sono-Fenton reagent from reduced graphene oxide (rGO). PANI-GQD hybrid was also synthesized using the chemical in situ polymerization method. The synthesized materials were characterized using UV-visible (UV-Vis) spectroscopy, photoluminescence (PL) spectroscopy, current-voltage (I-V) characteristic, thermal gravimetric analysis (TGA), Raman spectroscopy, and X-ray diffraction (XRD). Dynamic light scattering was also used to estimate the lateral size of GQDs. The enhanced visible-light absorbance in the hybrid was confirmed by UV-Vis analysis and the decrease in intensity around 3461 cm(-1) in FT-IR spectra was due to the interaction between functional groups of PANI with GQDs. This led to improved thermal stability and conductivity as observed from TGA and I-V analysis, respectively. Moreover, the Raman spectrum for PANI-GQDs showed a decrease in the peak at 1348 and 1572 cm(-1) as compared to PANI and GQDs. Similarly, from the XRD profile of PANI-GQDs, a shift in peak was observed due to an alteration in the microstructure. A sandwich device with cell structure glass/ITO/PANI-GQDs/Al was fabricated and its application was tested. Current density-voltage (J-V) curve of the device was measured with a Keithley SMU 2400 unit under an illumination intensity of 100 Wm(-2) simulating the AM 1.5 solar spectrum. The hybrid exhibited photovoltaic properties, and 0.857% efficiency was observed in response to the applied voltage. This work suggests that PANI can be used as an alternative material for photovoltaic cells.