Photovoltaic Efficiencies on Dye-Sensitized Solar Cells Assembled with Graphene-Linked TiO₂Anode Films

Abstract

To promote the photoelectric conversion efficiency of dye-sensitized solar cells (DSSCs), graphene is introduced as a working electrode with TiO 2 in this study, because it has great transparency and very good conductivity. XRD patterns indicate the presence of graphene and TiO 2 particles in graphene-linked TiO 2 samples. Moreover, TEM pictures also show that the nano-sized TiO 2 particles are highly dispersed and welllinked onto the thin layered graphene. On the basis of the UV-visible spectra, the band gaps of TiO 2 , 1.0 wt % graphene-TiO 2 , 5.0 wt % graphene-TiO 2 , and 10.0 wt % graphene-TiO 2 are 3.16, 2.94, 2.25, and 2.11 eV, respectively. Compared to pure TiO 2 , the energy conversion efficiency was enhanced considerably by the application of graphene-linked TiO 2 anode films in the DSSCs to approximately 6.05% for 0.1 wt % grapheneTiO 2 with N719 dye (10.0 mm film thickness and 5.0 mm × 5.0 mm cell area) under 100 mW/cm 2 of simulated sunlight. The quantum efficiency was the highest when 1.0 wt % of graphene was used. In impedance curves, the resistance was smallest for 1.0 wt % graphene-TiO 2 -DSSC.

Reduced graphene oxide-titania nanocomposite-modified photoanode for efficient dye-sensitized solar cells

“…These previous reports suggest that the DSSC performance of TiO 2 can be improved with the addition of graphene. Based on the different TiO 2 /graphene photoanode fabrication methods, such as squeeze printing technique , electrodepositing , doctor blade method and heterogeneous coagulation method , the DSSC efficiency also varied. In our present work, rGO–TiO 2 was prepared by rapid thermal reduction method and used as photoanode, and it showed the conversion efficiency of 4.74%.…”

Study on Optical Properties of Graphene-Tio2 Nanocomposite as Photoanodes Layer in Dye Sensitized Solar Cell (Dssc)

“…The determination of optical band gap was obtained from the interception of the abscissa axis with the straight line of the ( ℎ ) 1 pure TiO2 because less than 1 wt % of graphene is used. Based on previous report, the amount of graphene used was more than 1 wt % which are 1, 5 and 10 wt % Graphene-TiO2 and give lower band gap value of 2.94, 2.25 and 2.11 eV respectively [18].…”

The photovoltaic performance of CdS quantum dots sensitized solar cell using graphene/TiO2 working electrode

“…Lately, graphene, the two-dimensional carbon nanomaterial, has gained lots of attention due to its newly discovered amazing and unique characteristics [18,19], such as light weight, high electrical conductivity, large surface area, excellent mechanical strength, and three-dimensional flexibility [20,21]. Many studies [20][21][22][23] showed that CNTs can significantly improve the short circuit current density (J sc ) and power conversion efficiency (η) of dye-sensitized solar cells (DSSCs).…”