• DEVENDRA MOHAN

      Articles written in Bulletin of Materials Science

    • Process optimization of dye-sensitized solar cells using TiO$_2$–graphene nanocomposites

      BULKESH SIWACH DEVENDRA MOHAN SUNITA SHARMA DIVYA JYOTI

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      TiO$_2$–graphene (TGR) nanocomposites with varying concentrations of graphene from 0 to 1 wt% were preparedby 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 TiO$_2$ thatindicated a reduced band gap and hence, enhanced absorption bandwidth. Significant reduction in electron–hole recombinationwas confirmed from photoluminescence spectroscopy. These TGR nanocomposite films after tethering with black dyewere employed as photoanodes in dye-sensitized solar cells (DSSCs). The efficiency of solar cells at varying concentrationsof graphene (in photoandes) was also investigated. TGR 0.25 wt% nanocomposite showed the highest photocurrent density(JSC) of 18.4 mA cm$^{−2}$ and efficiency ($\eta$) of 4.69%.

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