TAILIEUCHUNG - Graphene effect on efficiency of Tio2-based dye sensitized solar cells (DSSC)

The electrodes after being sensitized with dye “N179” were combined with Pt counter electrodes and iodine-based electrolyte to make DSSC cells. I-V characteristics of the DSSC cells were recorded at room temperature. The open-circuit voltage (Voc), the short-current density (Jsc) and the photoelectric conversion efficiency η) of the DSSC cells were estimated. The results show that the graphene content added into TiO2 electrode films has affected on Voc, Jsc and η of cells in the nonlinear form. The efficiency reached a maximal value with a graphene concentration of wt %. It is supposed to be related with an improving the charge transfer in the working photo-electrode of DSSC. | Communications in Physics, Vol. 26, No. 1 (2016), pp. 43-49 DOI: GRAPHENE EFFECT ON EFFICIENCY OF TiO2 -BASED DYE SENSITIZED SOLAR CELLS (DSSC) NGUYEN THAI HA, PHAM DUY LONG† , NGUYEN THANH TRUNG, AND LE VAN HONG Institute of Materials Science, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam † E-mail: longphd@ Received 28 March 2016 Accepted for publication 22 April 2016 Abstract. Graphene embedded TiO2 films as photo-electrodes for dye sensitized solar cells (DSSC) was fabricated. Firstly, colloidal paste of TiO2 /Graphene was prepared by carefully mixing of a certain amount of graphene with TiO2 commercial paste, then it was used to spread TiO2 films and finely annealed at 450˚C to form nanocomposite TiO2 /graphene electrodes. The SEM images and Raman scattering were used to examine the morphology and microstructure as well as the existence of graphene in TiO2 electrode films. The electrodes after being sensitized with dye “N179” were combined with Pt counter electrodes and iodine-based electrolyte to make DSSC cells. I-V characteristics of the DSSC cells were recorded at room temperature. The open-circuit voltage (Voc ), the short-current density (Jsc ) and the photoelectric conversion efficiency η) of the DSSC cells were estimated. The results show that the graphene content added into TiO2 electrode films has affected on Voc , Jsc and η of cells in the nonlinear form. The efficiency reached a maximal value with a graphene concentration of wt %. It is supposed to be related with an improving the charge transfer in the working photo-electrode of DSSC. Keywords: graphene sheets (GS), dye sensitized solar cells (DSSC). Classification numbers: , . I. INTRODUCTION Recently, improving the open-circuit voltage, the short-circuit current and consequently the efficiency of dye-sensitized solar cells (DSSC) have been receiving much attention. As we known that in DSSC

• Vật lý
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• Graphene effect on efficiency of Tio2 based
• Dye sensitized solar cells
• The short current density
• The open circuit voltage
• TiO2 electrode films
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