Promoting Effect of Graphene on Dye-Sensitized Solar Cells
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- 作者：Hui Wang ; Samantha L Leonard ; Yun Hang Hu
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2012
- 出版时间：August 15, 2012
- 年：2012
- 卷：51
- 期：32
- 页码：10613-10620
- 全文大小：398K
- 年卷期：v.51,no.32(August 15, 2012)
- ISSN：1520-5045
文摘
In this paper, a simple approach without a prereduction of graphene oxide was exploited to prepare a graphene-doped TiO2 film for dye-sensitized solar cells (DSSCs). The performance measurement of the DSSCs showed that the incorporation of graphene could increase the short-circuit current density and power conversion efficiency by 52.4 and 55.3%, respectively. Furthermore, it was demonstrated that the performance enhancement was due to the promoting effect of graphene on electron transfer instead of the increase of dye loading in TiO2/graphene composite films. However, graphene can also absorb solar light, which could lead to the decrease of light harvest of dye molecules and thus a negative effect on the power conversion efficiency of DSSCs. Furthermore, graphene might decrease the actual dye loading on TiO2 in a TiO2/graphene film, which can also make a negative contribution to the conversion efficiency. As a result, the promoting effect of graphene is strongly dependent on its content; namely, the efficiency of DSSCs increases to the maximum value and then decreases with increasing graphene content in TiO2/graphene composites.