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CdS Quantum Dot-Sensitized Solar Cells Based on Nano-Branched TiO2 Arrays
Nanoscale Research Letters
  • Chang Liu, Shandong University
  • Yitan Li, Shandong University
  • Lin Wei, Shandong University
  • Cuncun Wu, Shandong University
  • Yanxue Chen, Shandong University
  • Liangmo Mei, Shandong University
  • Jun Jiao, Portland State University
Document Type
Publication Date
  • Solar batteries -- Design and construction,
  • Quantum electronics,
  • Quantum dots,
  • Photovoltaic cells
Nano-branched rutile TiO2 nanorod arrays were grown on F:SnO2 conductive glass (FTO) by a facile, two-step wet chemical synthesis process at low temperature. The length of the nanobranches was tailored by controlling the growth time, after which CdS quantum dots were deposited on the nano-branched TiO2 arrays using the successive ionic layer adsorption and reaction method to make a photoanode for quantum dot-sensitized solar cells (QDSCs). The photovoltaic properties of the CdS-sensitized nano-branched TiO2 solar cells were studied systematically. A short-circuit current intensity of approximately 7 mA/cm2 and a light-to-electricity conversion efficiency of 0.95% were recorded for cells based on optimized nano-branched TiO2 arrays, indicating an increase of 138% compared to those based on unbranched TiO2 nanorod arrays. The improved performance is attributed to a markedly enlarged surface area provided by the nanobranches and better electron conductivity in the one-dimensional, well-aligned TiO2 nanorod trunks

Copyright 2014 Liu et al.; licensee Springer.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited.

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Liu et al.: CdS quantum dot-sensitized solar cells based on nano-branched TiO2 arrays. Nanoscale Research Letters 2014 9:107. doi:10.1186/1556-276X-9-107