▎ 摘　　要

Graphene/titania (G/TiO2) nanocomposite photoanodes were fabricated for CdS quantum dots sensitized solar cells (QDSSCs) applications. The effect of G/TiO2 ratio (0, 0.1, 0.2, 0.5, and 1.0 wt.%) on the photovoltaic performance of CdS QDSSCs was investigated. CdS QDs were deposited onto G/TiO2 nanocomposite films by successive ionic layer adsorption and reaction (SILAR) technique for six cycles. The current density-voltage (J-V) characteristic curves of the assembled solar cells were measured at AM1.5 simulated sunlight. The optimal G/TiO2 ratio was 0.2 wt.% for photovoltaic performance. CdS QDSSCs based on 0.2 wt.% G/TiO2 nanocomposite photoanode achieve 32% increase in conversion efficiency (71) compared with those based on plain TiO2 NPs photoanode. The photovoltage-decay curves of the assembled cell were recorded. The electron-hole back recombination rates decrease significantly for CdS QDSSCs based on 0.2 wt.% ratio of G/TiO2 nanocomposite photoanode. The lifetime constants (tau) is much larger for CdS QDSSCs based on 0.2 wt.% ratio of G/TiO2 nanocomposite photoanode compared to those based on plain TiO2 NPs photoanodes. (C) 2015 Elsevier Ltd. All rights reserved.