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Preparation and properties of Co0.85Se/RGO composite counter electrodes for quantum-dot-sensitized solar cells

MAOLIN ZHANG1,* , JING LI1, ZHIQIANG NIE2,* , DONG YAN ZHANG1, YANGXI YAN1, ZHIMIN LI1

Affiliation

  1. School of Advanced Materials and Nanotechnology, Xidian University, Xi'an, 710071, China
  2. Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences Xi'an, 7101 19 , China

Abstract

Counter electrodes (CEs) are fundamentally important components of quantum dot sensitized solar cells (QDSSCs), helping to transfer electrons from external circuit to electrolyte and acting as catalysts. In this work, Co 0.85 Se/RGO composite films were synthesized via one step solvothermal process. X ray diffraction (XRD), scanning electron microscope ( SEM and energy dispersive spectrometer EDS were utilized to characterize the structure, morphology and elemental distribution of the composite CEs. The photovoltaic studies revealed that the composi te CEs could yield PCE reaching 2.6% when assembled with CdS/CdSe/TiO 2 photoanodes for QDSSCs. EIS and Tafel polarization indicated that the enhanced performances were due to combined high catalytic properties of Co 0.85 Se with better electron conductivity of RGO..

Keywords

Quantum dot sensitized solar cells Counter e lectrode s Co 0.85 Se /RGO composite material s Electrochemical performances.

Submitted at: May 27, 2019
Accepted at: Feb. 17, 2020

Citation

MAOLIN ZHANG, JING LI, ZHIQIANG NIE, DONG YAN ZHANG, YANGXI YAN, ZHIMIN LI, Preparation and properties of Co0.85Se/RGO composite counter electrodes for quantum-dot-sensitized solar cells, Journal of Optoelectronics and Advanced Materials Vol. 22, Iss. 1-2, pp. 23-28 (2020)