One-step fabrication of copper sulfide nanoparticles decorated on graphene sheets as highly stable and efficient counter electrode for CdS-sensitized solar cells

• Amr Hessein

• Feiju Wang

• Hirokazu Masai

• Kazunari Matsuda

• Ahmed Abd El-Moneim

Abstract

Quantum-dot-sensitized solar cells (QDSSCs) are thin-film photovoltaics and highly promising as next-generation solar cells owing to their high theoretical efficiency, easy fabrication process, and low production cost. However, the practical photoconversion efficiencies (PCEs) of QDSSCs are still far below the theoretically estimated value owing to the lack of an applicable design of the materials and electrodes. In this work, we developed a highly stable and efficient counter electrode (CE) from copper sulfide nanocrystals and reduced graphene oxide (Cu x S@RGO) for QDSSC applications. The Cu x S@RGO electrocatalyst was successfully prepared by a facile one-pot hydrothermal method, then directly applied to a fluorine-doped tin oxide (FTO)-coated glass substrate by the simple drop-casting technique. Owing to the synergistic effect between Cu x S nanocrystals and conductive RGO sheets, the Cu x S@RGO CE showed high electrocatalytic activity for polysulfide electrolyte reduction. A CdS QDSSC based on the Cu x S@RGO CE yielded a high and reproducible PCE of 2.36%, exceeding those of 1.57 and 1.33% obtained with the commonly used Cu 2 S/brass and Pt CEs, respectively. Moreover, the QDSSC with the Cu x S@RGO CE showed excellent photostability in a light-soaking test without any obvious decay in the photocurrent, whereas the cell based on the Cu 2 S/brass CE was severely degraded.

Journal

• Japanese Journal of Applied Physics

  Japanese Journal of Applied Physics 55 (11), 112301-, 2016-10-07

  IOP Publishing

Keywords

• General Physics and Astronomy
• General Engineering

Details

• CRID: 1360002221359485696
• NII Article ID: 210000147229
• DOI: 10.7567/jjap.55.112301
• ISSN: 13474065
• ISSN: 00214922
• Web Site: http://stacks.iop.org/1347-4065/55/i=11/a=112301/pdf
• Web Site: http://stacks.iop.org/1347-4065/55/i=11/a=112301?key=crossref.896867345d56b9dfcb345be3bb51ee2d
• Web Site: https://iopscience.iop.org/article/10.7567/JJAP.55.112301
• Web Site: https://iopscience.iop.org/article/10.7567/JJAP.55.112301/pdf
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