Three-dimensional ZnO nanodendrite/nanoparticle composite solar cells

Chun Te Wu, Wen Pin Liao, Jih-Jen Wu

研究成果: Article同行評審

77 引文 斯高帕斯(Scopus)

摘要

Three-dimensional (3D) ZnO nanodendrite (ND)/nanoparticle (NP) composite films have been synthesized on fluorine-doped tin oxide (FTO) substrates using a wet chemical route. Aligned and high-density ZnO nanowires (NWs) are synthesized on the FTO substrate to be the trunks of the ND array by chemical bath deposition (CBD) in an aqueous solution of zinc acetate and hexamethylenetetramine. The branches of the NDs are subsequently formed on the surface of NWs using another CBD in an aqueous solution of zinc acetate and NaOH without any organic structure-directing agent and seed layer. ZnO NPs are further bottom-up grown within the interstices of the ZnO NDs using a base-free CBD method to form the 3D ZnO ND/NP composite film. Transmission electron microscopy (TEM) characterization and intensity modulated photocurrent spectroscopy (IMPS) measurements indicate that the 3D and quasi-signal- crystalline framework for fast electron transport are successfully constructed in the ZnO ND array. With an anode thickness of 3.5 μm, the efficiency of the D149-sensitized ZnO ND/NP composite DSSC is 3.74%, which is superior to that of the N719-sensitized TiO2 NP DSSC. IMPS measurements indicate that the dynamics of electron transport in the ZnO ND/NP composite DSSC are insensitive to light intensity and the electron transport rate in the ZnO ND/NP composite anode is enhanced by thirty-fold compared to that in the TiO 2 NP anode. The superior electron transport properties in the ZnO ND/NP composite DSSC are ascribed to the 3D quasi-signal-crystalline framework of the ND array constructed in the composite anode.

原文English
頁(從 - 到)2871-2876
頁數6
期刊Journal of Materials Chemistry
21
發行號9
DOIs
出版狀態Published - 2011 3月 7

All Science Journal Classification (ASJC) codes

  • 化學 (全部)
  • 材料化學

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