The Performance Of Graphene Dye-sensitised Solar Cells Research

Recently, dye-sensitized solar cell (DSSC) has received much attention as a new type of solar cells due to its potential low cost and large energy conversion efficiency. Because of its high transparency, good electrical conductivity and strong catalytic activity, graphene has become the research focus in dye-sensitized solar cell.In this thesis, the optoelectronic properties of DSSC using graphene film as counter electrode, Pt nanoparticles (PtNPs)/graphene film as counter electrode, reduced graphene oxide (RGO) as counter electrode, PtNPs/RGO as counter electrode and RGO/TiO2photoanode were systematically investigated. The main results are as as fellows.(1) The electrocatalytic activity of graphene film (G), N doped graphene (NG) film, PtNPs/G and PtNPs/NG were studied. The results show that DSSC employing G, NG, PtNPs/G, or PtNPs/NG counter electrode reached a conversion efficiency (η) of2.35%,2.85%,3.43%, or3.64%, respectively. The conversion efficiency of DSSC with PtNPs/G and PtNPs/NG counter electrodes were close to cells with Pt counter electrode(η=3.76%), which demonstrates that PtNPs/G and PtNPs/NG have high electrocatalytic activity.(2) The electrocatalytic activity of were investigated. The results show that DSSC employing RGO ounter electrode has a conversion efficiency of2.72%. DSSC with PtNPs/RGO has a conversion efficiency (η) of3.89%, which is higher than that with RGO counter electrode and slightly larger than that with Pt counter electrode (η=3.76%). It indicates that PtNPs/RGO composite has excellent electrocatalytic activity.(3) The preparation and electrocatalytic activity of RGO/TiO2photoanode were investigated. The effects of RGO content, the sintered temperature of RGO/TiO2photoanode, the C ratio of RGO, and the dispersion of RGO into the TiO2were studied. The results demonstrate that DSSC employing RGO/TiO2(RGO0.34wt%) photoanode with a C ratio of84.87%and a sintered temperature of500℃has a conversion efficiency of5.19%, which is40.7%higher than that with conventional TiO2photoanode (η=3.69%). (4) DSSC with PtNPs/RGO counter electrode and RGO/TiO2photoanode was made and optimized. The results show that DSSC employing PtNPs/RGO (Ptl.6wt%) counter electrode and RGO/TiO2(RGO0.34wt%) photoanode has a conversion efficiency of5.22%, which is41.5%higher than that employing TiO2photoanode and Pt counter electrode (η=3.69%).