An Unconventional Route to High-Efficiency Dye-Sensitized Solar Cells via Embedding Graphitic Thin Films into TiO2 Nanoparticle Photoanode

详细信息    查看全文

• 作者：Yoon Hee Jang ; Xukai Xin ; Myunghwan Byun ; Yu Jin Jang ; Zhiqun Lin ; Dong Ha Kim
• 刊名：Nano Letters
• 出版年：2012
• 出版时间：January 11, 2012
• 年：2012
• 卷：12
• 期：1
• 页码：479-485
• 全文大小：387K
• 年卷期：v.12,no.1(January 11, 2012)
• ISSN：1530-6992

文摘

Graphitic thin films embedded with highly dispersed titanium dioxide (TiO₂) nanoparticles were incorporated for the first time into the conventional dye-sensitized solar cells (DSSCs), resulting in a remarkably improved cell efficiency due to its superior electron conductivity. Massively ordered arrays of TiO₂ dots embedded in carbon matrix were fabricated via UV-stabilization of polystyrene-block-poly(4-vinylpyridine) films containing TiO₂ precursors followed by direct carbonization. For dye-sensitized TiO₂ based solar cells containing carbon/TiO₂ thin layers at both sides of pristine TiO₂ layer, an increase of 40.6% in overall power conversion efficiency was achieved compared with neat TiO₂-based DSSCs. Such a remarkably improved cell efficiency was ascribed to the superior electron conductivity and extended electron lifetime elucidated by cyclic voltammetry and impedance spectroscopy.

Keywords:

Carbon/TiO₂ thin film; dye-sensitized solar cells; block copolymer template; direct carbonization