Abstract
AbstractThis article presents the physicochemical and photovoltaic properties of the (TiO2)1‐x(RGO)x nanocomposites (NCs) with varying the content of reduced graphene oxide (RGO) (x=0.1 to 1.0 wt. %). Firstly, NCs were synthesized via in‐situ sol‐gel route. The compositional dependent physicochemical properties of the powdered (TiO2)1‐x(RGO)x NCs were studied by using various spectroscopic (XRD, Raman, FTIR, UV‐Visible DRS, PL, XPS), microscopic (HR‐TEM with SAED) and BET measurements. Thereafter, thin–films of NCs were prepared by using binder‐free doctor‐blade technique and these films were sensitized with Ru(II) sensitizers. Before fabrication, the anchoring and absorption properties of the sensitizers with NCs were also studied. Finally, the sandwich dye sensitized solar cells (DSSCs) of (TiO2)1‐x(RGO)x with sensitizers were tested through I–V and IPCE measurements. Among the different (TiO2)1‐x(RGO)x photoelectrodes, T0.925@R0.075 NCs‐based devices reached the conversion efficiency (η) up to 5.98% for N719 to that of 4.76% for N3 device; which was four times higher to that of bare TiO2 with N719 (1.35%) and N3 (1.12%) based DSSCs. The observed photovoltaic parameters of the devices were further supported with the time‐resolved photoluminescence (TRPL) and electrochemical impedance spectroscopy (EIS) measurements of the (TiO2)1‐x(RGO)x NCs.
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