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Chin. Phys. B, 2015, Vol. 24(4): 047205    DOI: 10.1088/1674-1056/24/4/047205
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Decrease of back recombination rate in CdS quantum dots sensitized solar cells using reduced graphene oxide

Ali Badawi
Department of Physics, Faculty of Science, Taif University, Taif, Saudi Arabia
Abstract  The photovoltaic performance of CdS quantum dots sensitized solar cells (QDSSCs) using the 0.2 wt% of reduced graphene oxide and TiO2 nanoparticles (RGO+TiO2 nanocomposite) photoanode is investigated. CdS QDs are adsorbed onto RGO+TiO2 nanocomposite films by the successive ionic layer adsorption and reaction (SILAR) technique for several cycles. The current density-voltage (J-V) characteristic curves of the assembled QDSSCs are measured at AM1.5 simulated sunlight. The optimal photovoltaic performance for CdS QDSSC was achieved for six SILAR cycles. Solar cells based on the RGO+TiO2 nanocomposite photoanode achieve a 33% increase in conversion efficiency (η) compared with those based on plain TiO2 nanoparticle (NP) photoanodes. The electron back recombination rates decrease significantly for CdS QDSSCs based on RGO+TiO2 nanocomposite photoanodes. The lifetime constant (τ) for CdS QDSSC based on the RGO+TiO2 nanocomposite photoanode is at least one order of magnitude larger than that based on the bare TiO2 NPs photoanode.
Keywords:  reduced graphene oxide      nanocomposite photoanode      back recombination rate      quantum dots sensitized solar cell  
Received:  10 September 2014      Revised:  14 November 2014      Published:  05 April 2015
PACS:  72.80.Vp (Electronic transport in graphene)  
  78.67.Wj (Optical properties of graphene)  
  78.67.Sc (Nanoaggregates; nanocomposites)  
  78.67.Hc (Quantum dots)  
Fund: Project supported by the Fund from Taif University, Saudi Arabia (Grant No. 1/435/3524).
Corresponding Authors:  Ali Badawi     E-mail:  adaraghmeh@yahoo.com

Cite this article: 

Ali Badawi Decrease of back recombination rate in CdS quantum dots sensitized solar cells using reduced graphene oxide 2015 Chin. Phys. B 24 047205

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