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> Light Guide Component in Efficiency Enhancement of, DSSC
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VAL
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Light Guide Component in Efficiency Enhancement of DSSC
Источники:
- http://what-when-how.com/experimental-and-...lied-mechanics/ - what-when-how (In Depth Tutorials and Information)

QUOTE
Introduction

Dye-sensitized solar cells (DSSCs) have been intensively investigated in past few years [1-3], driven by their promises for future, cost-effective, easily mass production. DSSCs were comprised by four key components, which are respectively said photo electrode [4,5], said platinum (Pt) counter electrode [4-7] disposed opposite to the photo electrode, said electrolyte solution [5,6] contained iodide/tri-iodide redox couple between the photo and counter electrodes and said sealing spacer [8,9] for spacing the photo and counter electrodes and sealing the electrolyte solution. In general, the photo electrode was formed by a dye covered nanoporous TiO2 film (D-NTF) fabricated on a transparent conducting substrate and designated to perform the light-to-electricity operation. When the light illuminates the D-NTF of the photo electrode, the dye will be excited by the light, thereby leading to a fast injection of electrons into the conduction band of TiO2 and further movement toward the transparent conducting substrate. However, the light also illuminates the sealing spacer, then penetrates the sealing spacer and finally departs from the cell. This means that the light illuminated on the D-NTF could be effectively used. On the contrary, the light illuminated on the sealing spacer would be wasted, said phenomenon could be strongly observed in grid type DSSCs [10,11]. Lee et al. [10] and Ramasamy et al. [11] used many sealing spacers to separately seal each of the cells, so it could be anticipated that a lot of illuminated light would penetrate the sealing spacers incapable of being used. In other words, the light harvesting efficiency of DSSCs would be enhanced if the light could be turned toward the D-NTF before illuminating the sealing spacer. Therefore, we present a light guide component (LGC) and illustrate how this component turns the light toward the D-NTF and further improves photovoltaic performance of DSSCs. 



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