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Jpn. J. Appl. Phys. 50 (2011) 04DP06 (5 pages)  |Previous Article| |Next Article|  |Table of Contents|
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Multiscale Simulation of Dye-Sensitized Solar Cells Considering Schottky Barrier Effect at Photoelectrode

Mari Onodera1, Ryo Nagumo3, Ryuji Miura1, Ai Suzuki3, Hideyuki Tsuboi2, Nozomu Hatakeyama2, Akira Endou2, Hiromitsu Takaba1, Momoji Kubo4, and Akira Miyamoto1,2,3

1Department of Chemical Engineering, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
2Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
3New Industry Creation Hatchery Center, Tohoku University, Sendai 980-8579, Japan
4Fracture and Reliability Research Institute, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan

(Received September 21, 2010; revised November 15, 2010; accepted November 16, 2010; published online April 20, 2011)

The effect of the TiO2/transparent conducting oxide (TCO) interface in a photoelectrode of a dye-sensitized solar cell (DSSC) on its cell performance was investigated using our multiscale simulator, in which we had added a calculation of the voltage loss derived from the Schottky barrier height (SBH) at the TiO2/TCO interface to our previous simulator. We treated the TiO2/TCO interface as a series connection of a Schottky diode of metal/n-type semiconductor. The thermionic-emission theory was applied to describe the electron transfer and the voltage loss at the TiO2/TCO interface. The accuracy of the prediction of the current density–voltage (J–V) characteristics of a DSSC employing the cis-dithiocyanato-bis(2,2'-bipyridyl-4,4'-dicarboxylic acid)-ruthenium(II) (N3 dye) was improved compared with that obtained by our previous simulator. The effects of the SBH on the open circuit voltage (VOC) and the maximum power output (Pmax), as well as the J–V characteristics, of the DSSC were discussed. Our results suggest that a TCO with the SBH≤0.5 is suitable for a DSSC.

URL: http://jjap.jsap.jp/link?JJAP/50/04DP06/
DOI: 10.1143/JJAP.50.04DP06
PACS: 88.40.-j, 81.05.Hd, 42.70.Gi, 85.60.Bt, 73.30.+y


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