Plasmon-enhanced Performance of Dye-sensitized Solar Cells Based on Electrodeposited Ag Nanoparticles

doi:10.1016/j.jmst.2013.09.007

Abstract

Abstract:

In the present work, pulse current deposition is used to deposit evenly distributed and uniformly sized Ag nanoparticles onto a TiO₂ nanotube array as photoelectrode in dye-sensitized solar cells (DSSCs), and the size and amount of loading Ag nanoparticles are controlled by the pulse deposition time. Due to the enhanced light absorption and electron–hole separation caused by plasmon effect, DSSCs based on Ag-modified TiO₂ nanotube arrays show higher energy conversion efficiencies than those based on bare nanotubes with the same tube length. Particularly, DSSC based on nanotubes modified using pulse deposition time 1 s/3 s delivers the highest energy conversion efficiency of 1.68% and the largest short-circuit current of 4.37 mA/cm², while DSSC consisting of bare nanotubes exhibits efficiency of 1.20% and short-circuit current of 2.27 mA/cm², which represents a 40% enhancement of cell efficiency in DSSC based on Ag-modified TiO₂ nanotubes. It is also noted that overly long pulse deposition time will not further increase DSSC efficiency due to agglomeration of Ag particles. For example, when the pulse deposition time is increased to 2 s/6 s, DSSC based on Ag-modified nanotubes exhibits a lower efficiency of 1.42%. Moreover, high-concentration TiCl₄ treatment on TiO₂ nanotube arrays can further increase the energy conversion efficiencies to 3.82% and 2.61% for DSSC based on Ag-modified TiO₂ nanotubes and DSSC based on bare TiO₂ nanotubes, respectively, by significantly creating more surface area for dye loading.

Key words: TiO₂ nanotube, Dye-sensitized solar cell, Pulse current deposition, Ag nanoparticle, TiCl₄ treatment

Xinning Luan, Ying Wang. Plasmon-enhanced Performance of Dye-sensitized Solar Cells Based on Electrodeposited Ag Nanoparticles[J]. J. Mater. Sci. Technol., DOI: 10.1016/j.jmst.2013.09.007.

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