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Graphene/PbS as a novel counter electrode for quantum dot sensitized solar cells

Parand, P ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1021/ph400011z
  3. Abstract:
  4. PbS nanoparticles were in situ deposited on graphene sheets by a successive ionic liquid adsorption and reaction method to prepare a graphene/PbS composite counter electrode for CdS/CdSe quantum dot sensitized solar cells (QDSCs). Under 1 sun illumination, the cells with graphene/PbS counter electrodes (CEs) show a maximum energy conversion efficiency of 2.63%, which is remarkably higher than that of those employing PbS (1.28%) or graphene (0.23%) CEs. Electrochemical impedance spectroscopy analysis shows that graphene/PbS composite counter electrodes have lower charge-transfer resistance at the interface of the CE and the polysulfide redox electrolyte, compared to those cells with PbS and graphene counter electrodes. For the first reported CdS/CdSe-sensitized cells with the G/PbS CE, a cell performance with 2.63% efficiency (Voc = 559 mV, Jsc = 11 mA/cm2, FF = 0.42) was obtained, which is comparable with the photovoltaic properties of the cells with optimized conventional Cu2S CEs (η = 3.01%, Voc = 564 mV, Jsc = 11.6 mA/cm2, FF = 0.46). Our results indicate the potential application of graphene/noble metal sulfide composite electrodes in high-efficiency QDSCs
  5. Keywords:
  6. counter electrode ; Solar cell ; Cadmium sulfide ; Charge transfer ; Electrochemical impedance spectroscopy ; Electrodes ; Graphene ; Ionic liquids ; Nanocrystals ; Semiconductor quantum dots ; Solar cells ; Charge transfer resistance ; Composite electrode ; Counter electrodes ; PbS ; Photovoltaic property ; quantum dot ; Quantum dot-sensitized solar cells ; Redox electrolytes ; Electrochemical electrodes
  7. Source: ACS Photonics ; Vol. 1, issue. 4 , March , 2014 , pp. 323-330 ; ISSN: 23304022
  8. URL: http://pubs.acs.org/doi/abs/10.1021/ph400011z?journalCode=apchd5