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138                                Multifunctional Photocatalytic Materials for Energy

          Table 7.2  Literature reports of graphene-based materials as
          sensitizer in a DSSC and their photovoltaic parameters (short-
          circuit current (J sc ), open circuit voltage (V oc ), fillfactor, and
          power conversion efficiency (PCE))

                                                2
          Graphene metal composites     J sc  (mA/cm )  V oc  (V)  FF%  PCE  Ref
          Reduced graphene oxide(rGO) a  11.61      0.747   26.2  2.27  [87]
          Reduced graphene oxide(rGO)/TaON a  11.62  0.775  38.1  3.43
          TaON nanoparticles a           7.83       0.725   11.3  0.64
          Pt reference a                13.08       0.785   75.8  7.78
          Reduced graphene oxide(rGO) a  10.98      0.716   40    3.14  [88]
                                    a
          Reduced graphene oxide(rGO)/NiS 2  16.55  0.749   69    8.55
          NiS 2  only a                 14.42       0.738   66    7.02
          Pt reference a                15.75       0.739   70    8.15
          Reduced graphene oxide(rGO) a  15.26      0.767   44.27  5.18  [89]
          NiO nanoparticles/rGO nanohybrids a  15.57  0.763  62.40  7.42
          Graphene oxide (GO) a         14.37       0.775   40.18  4.48
          Pt-sputtered reference a      16.80       0.763   63.84  8.18
          RuO 2 /reduced graphene oxide(rGO) a  16.13  0.766  67.33  8.32  [90]
          RuO 2  nanoparticles a        10.10       0.760   30.98  2.36
          Pt reference a                17.01       0.78    61.53  8.16
          Ni-decorated graphene a       10.32       0.547   42.0  2.39  [91]
          Ni 0.75 Cu 0.25 -decorated graphene a  10.35  0.75  65.0  5.1
          Pt reference a                16.12       0.718   51.0  5.9
          Pristine graphene a            9.58       0.431   42.0  1.72
          SnS 2  nanoparticles b/reduced   14.80    0.718   67.02  7.12  [92]
          graphene oxide a
          Reduced graphene oxide(rGO) a  10.8       0.661   52.29  3.73
          SnS 2  only a                 13.6        0.770   53.28  5.58
          Pt-sputtered reference a      14.00       0.720   67.36  6.79
          Graphene/nickel phosphide (Ni 12 P 5 ) a  12.86  0.727  61  5.70  [93]
          Graphene a                    12.88       0.701   52    4.70
          Nickel phosphide (Ni 12 P 5 ) a  12.24    0.727   44    3.94
          Pt reference a                13.12       0.744   62    6.08
          Graphene (1.2 wt.%) ZnO       10.89       0.66    47.6  3.19  [85]
          hierarchically structured nanoparticle
          (HSN) a
          ZnO HSN ONLY (3 micron         7.60       0.67    42.1  2.31
          thickness) a
          Hierarchically structured ZnO film b  10.9  0.67  48.1  3.51  [94]
          Commercial ZnO film b          1.65       0.57    63.2  0.60
          Graphene/ZnO nanoparticles bilayer a  17.5  0.5   45.6  3.98  [95]
          ZnO nanoparticles a           11.3        0.45    47.3  2.40
          Graphene nanosheets/ZnO nanorods c  21.7  0.765   67    8.12  [96]
          CVD-Graphene oxide/ZnO nanorods a  6.56   0.704   54    2.50  [97]
          ZnO nanorods a                 3.45       0.591   58    1.18
          Graphene nanoplatelets/Ag nanowire c  6.45  0.55  52    1.61  [98]
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