Light management in dye-sensitized solar cell |
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Authors: | Nam-Gyu Park |
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Affiliation: | (1) Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 305-701, South Korea;(2) Research center, BioAlpha Inc., Seongnam, 462-120, South Korea;(3) Hybrid Research Center, Korea Institute of Science and Technology, P.O. Box 131, Seoul, South Korea;(4) Department of Metal and Materials Engineering, Kangnung National University, Kangnung, 210-702, South Korea; |
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Abstract: | Dye-sensitized solar cell (DSSC) is composed of a nanocrystalline TiO2 film whose surface is covered with dye molecules, an iodide/tri-iodide electrolyte and a platinum counter electrode. Charge
generation occurs when dye absorbs photon energy, which is separated by injection of photo-excited electrons into the conduction
band of TiO2. The photo-injected electrons are transported through TiO2 network and collected at transparent conducting electrode. The oxidized dyes are regenerated by oxidation of iodide. Light-to-electricity
conversion efficiency depends on photocurrent density, open-circuit voltage and fill factor. Photocurrent density is related
to the incident photon-to-current conversion efficiency (IPCE) that is a collective measure of light harvesting, charge separation
and charge collection efficiency. Since the higher IPCE, the higher photocurrent density becomes, light management in DSSC
is one of most important issues. In this paper, effective methods to improve IPCE are described including size-dependent light
scattering effect, bi-functionality design in material synthesis and panchromatic approach such as selective position of different
dyes in a mesoporous TiO2 film. |
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