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Properties of Working Electrodes with IGZO layers in a Dye Sensitized Solar Cell
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 Title & Authors
Properties of Working Electrodes with IGZO layers in a Dye Sensitized Solar Cell
Kim, Gunju; Noh, Yunyoung; Choi, Minkyoung; Kim, Kwangbae; Song, Ohsung;
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We prepared a working electrode (WE) coated with 0 ~ 50 nm-thick indium gallium zinc oxide(IGZO) by using RF sputtering to improve the energy conversion efficiency (ECE) of a dye sensitized solar cell (DSSC). Transmission electron microscope (TEM) and energy dispersive spectroscopy (EDS) were used to analyze the microstructure and composition of the IGZO layer. UV-VIS-NIR spectroscopy was used to determine the transparency of the WE with IGZO layers. A solar simulator and a potentiostat were used to confirm the photovoltaic properties of the DSSC with IGZO layer. From the results of the microstructural analysis, we were able to confirm the successful deposition of an amorphous IGZO layer with the expected thickness and composition. From the UV-VIS-NIR analysis, we were able to verify that the transparency decreased when the thickness of IGZO increased, while the transparency was over 90% for all thicknesses. The photovoltaic results show that the ECE became 4.30% with the IGZO layer compared to 3.93% without the IGZO layer. As the results show that electron mobility increased when an IGZO layer was coated on the layer, it is confirmed that the ECE of a DSSC can be enhanced by employing an appropriate thickness of IGZO on the layer.
Dye sensitized solar cells;RF sputtering;Energy conversion efficiency;IGZO;
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