• 文献标题:   Nitrogen plasma modified CVD grown graphene as counter electrodes for bifacial dye-sensitized solar cells
  • 文献类型:   Article
  • 作  者:   YANG W, XU XW, TU ZQ, LI Z, YOU B, LI YF, RAJ SI, YANG F, ZHANG LQ, CHEN SL, WANG AJ
  • 作者关键词:   bifacial dyesensitized solar cell, counter electrode, cvd grown graphene, n2 plasma
  • 出版物名称:   ELECTROCHIMICA ACTA
  • ISSN:   0013-4686 EI 1873-3859
  • 通讯作者地址:   China Univ Petr
  • 被引频次:   16
  • DOI:   10.1016/j.electacta.2015.05.143
  • 出版年:   2015

▎ 摘  要

In this study, we report modification of few-layer graphene grown by chemical vapour deposition via nitrogen plasma ion irradiation and its application as counter electrodes in bifacial dye-sensitized solar cells (DSSCs). The incorporation of nitrogen (N) atoms and defects are confirmed by X-ray photoelectron spectroscopy and Raman spectroscopy. Electrochemical impedance spectroscopy measurement reveals that the charge transfer resistance of graphene for triiodide reduction shows a decrease with increasing plasma treatment time, which is attributed to the increase of catalytic sites. The energy conversion efficiency of 3.12% is obtained when using the N-doped graphene films as counter electrodes, which is nearly 3 times higher than that of the pristine graphene films in DSSCs. More importantly, the DSSCs based on N-doped graphene CEs show much higher eta(rear)/eta(front) ratio and better long-term stability than that based on Pt CEs. These results reveal the promising potential of this transparent N-doped graphene CEs in low cost and effective bifacial DSSCs. (C)2015 Elsevier Ltd. All rights reserved.