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

doi:10.1088/1674-1056/24/4/047205

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 TiO₂NPs photoanode.

Keywords: reduced graphene oxide nanocomposite photoanode back recombination rate quantum dots sensitized solar cell

Received: 10 September 2014
Revised: 14 November 2014
Accepted manuscript online:

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

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

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