Open AccessCoSe2/graphene composite: a low-cost, high performance counter electrode for dye sensitized solar cells
Author(s) -
C. Tamilselvi,
Parimala devi Duraisamy,
N. Subathra,
T. Sumathi,
R Sonia Fredrick
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2070/1/012078
Subject(s) - dye sensitized solar cell , graphene , auxiliary electrode , materials science , raman spectroscopy , electrode , x ray photoelectron spectroscopy , energy conversion efficiency , selenide , composite number , hydrothermal circulation , absorption (acoustics) , cobalt , optoelectronics , chemical engineering , nanotechnology , optics , chemistry , composite material , electrolyte , physics , engineering , selenium , metallurgy
In this study, Pt-free dye-sensitized solar cells (DSSCs) were fabricated using cobalt selenide (CoSe 2 )/graphene sheets using facile hydrothermal technique. The Pt free counter electrode (CE) was systematically investigated their physico-chemical properties by using SEM, TEM, XRD, Raman, UV, PL, XPS and BET analysis. Under typical AM 1.5G illumination, the DSSC based on the CoSeSe 2 counter electrode achieves a maximum PCE of 12.2 % (Jsc = 22.3 mA/cm 2 , Voc= 810 mV, and FF= 0.71), which is 5.8 times higher than that of conventional Pt-based DSSC. The improved electro catalytic activity and photo conversion efficiency of the CoSeSe 2 /graphene CE is due to prevent the recombination of electron-hole pair and extended the visible light absorption of composite samples.