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SOLAR ENERGY R&D IN ASIA

Durability of Dye-Sensitized Solar Cells and Modules

[+] Author and Article Information
Takayuki Kitamura1

Environment and Energy Laboratory, Fujikura Ltd., 1440 Mutsuzaki, Sakura, Chiba, 285-8550, Japan

Kenichi Okada, Hiroshi Matsui, Nobuo Tanabe

Environment and Energy Laboratory, Fujikura Ltd., 1440 Mutsuzaki, Sakura, Chiba, 285-8550, Japan

1

Present address: Optics and Electronics Laboratory, Fujikura Ltd.

J. Sol. Energy Eng 132(2), 021105 (May 04, 2010) (7 pages) doi:10.1115/1.4001152 History: Received February 26, 2009; Revised December 07, 2009; Published May 04, 2010; Online May 04, 2010

It was investigated that the intrusion of water into the electrolyte was the most critical reason for the low stability of a dye-sensitized solar cell. To prevent the water intrusion, robust solar cells and submodules with a novel protection layer of metal circuit and tightly sealing package was developed. The excellent stability of the cell with ionic liquid electrolyte at high temperature conditions was also reveled. The resulting cell employing noble construction and ionic liquid electrolyte showed an extremely high stability to pass several endurance tests standardized in JIS for the stability of the photovoltaic submodule.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 5

Cross sectional schematic structure of the package of cell and module

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Figure 6

Picture of cells and submodules housed in package

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Figure 7

Time course of the photovoltaic parameters of 50×50 mm2 cell with current collecting grid and ionic liquid electrolyte assembled in the Ar-filled dry box under (a) damp heat test (85°C, 85%RH), (b) thermal cycling test (−40°C↔90°C), and (c) light soaking test (AM 1.5G, 1000 W/m2); data were reported as normalized values

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Figure 1

Cyclic voltammograms of two-electrode test cells using water containing I−/I3− redox electrolyte and protective layer of current collecting grid: (a) coating only with low-melting glass frit, and (b) novel coating with double layer with glass frit and resin; scan rate: 100 mV/s

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Figure 2

Time course change in (a) appearance, (b) surface SEM image, and (c) XPS of Pt coated FTO glass as a function of storage time at 85°C in the dark, HMImI electrolyte with 1 wt % of H2O; thickness of Pt on FTO was ca. 100 nm

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Figure 3

Time course change in relative short-circuit photocurrent density (J/J0) of the cells with ionic liquid electrolyte stored at room temperature in the dark: (a) effect of water content of electrolyte on 5×5 mm2 cells, and (b) effect of atmosphere of assembling on grid-lined 50×50 mm2 cells

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Figure 4

Time course of the photovoltaic performance of 10×50 mm2 cells with ionic liquid electrolyte stored in the hermetic sealed container at 85°C in the dark; the cells were assembled in the Ar-filled dry box; data from the two individual cells were plotted as normalized values

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Figure 8

Time course of the conversion efficiency of 50×50 mm2 cell with current collecting grid and volatile electrolyte assembled in the Ar-filled dry box under damp heat test (85°C, 85%RH); data from the four individual cells were plotted

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