Incorporation of plasma-functionalized carbon nanocapsules into a nanocrystalline TiO2 photoanode for use in dye-sensitized solar cells

Yen Fong Chan, Chen Chien Wang, Bing Hung Chen, Chuh Yung Chen

研究成果: Article同行評審

8 引文 斯高帕斯(Scopus)

摘要

Dye-sensitized solar cells (DSSCs) were fabricated using TiO2 nanoparticles incorporating different amounts of plasma functionalized carbon nanocapsules (CNCs) as the photoanode. The functionalization was obtained by grafting maleic anhydride (MA) onto the walls of CNCs immediately after the in situ argon plasma treatment. Nanocrystalline semiconductor film electrodes were prepared by sintering TiO2 with added MA-CNCs on a conducting glass substrate. Capacitance measurements obtained from electrochemical impedance spectroscopy (EIS) analysis in an aqueous electrolyte are fitted using the Mott-Schottky relationship and demonstrate the variation of flatband potential (Vfb) for the composite with MA-CNC content. The potential chronoamperometric and cyclic voltammetric data supports the argument that the increased Vfb minimizes the defect state for trapping/detrapping of electrons within the MA-CNC/TiO2. As a result of higher film capacitance and electron accumulation, the MA-CNC/TiO2 shows increased conversion efficiency and photocurrent density when used as the photoanode in DSSCs. EIS measurement further demonstrates that charge recombination at the interface of MA-CNC/TiO2 and electrolyte is suppressed with increasing electron lifetime and is in good agreement with the photovoltaic performance. The amount of MA-CNCs added, however needs to be optimized due to the unavoidable issue of aggregation.

原文English
頁(從 - 到)4898-4910
頁數13
期刊Carbon
49
發行號14
DOIs
出版狀態Published - 2011 十一月

All Science Journal Classification (ASJC) codes

  • 化學 (全部)
  • 材料科學(全部)

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