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Simple approach for enhancement of light harvesting efficiency of dye-sensitized solar cells by polymeric mirror

Jun Young Lee, Seungwoo Lee, Jung-Ki Park, Yongseok Jun, Young-Gi Lee, Kwang Man Kim, Jin Ho Yun, and Kuk Young Cho

Open Access Open Access

Abstract

A Polymeric mirror from 1D photonic crystal exhibiting full specular reflection is applied on the exterior of the counter electrode of a dye-sensitized solar cells (DSSCs). Reflection of exiting light from the cell allows for the reuse of the light and thereby significantly increases the efficiency of the DSSCs (from 8.07% to 8.85%). Furthermore, it is also found to be effective even with incorporation of an internal scattering layer, which is widely used within a TiO2 anode layer for enhancing light trapping in DSSCs (from 9.17% to 9.53%).

©2010 Optical Society of America

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Figures (4)
Fig. 1
Fig. 1 Schematic diagram showing the concept of highly reflectance film supported DSSC. (a) DSSC configuration used for reference cell. (b) Modification of reference by applying polymeric reflective film at the exterior of counter electrode. FTO is fluorine-doped tin oxide.

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Fig. 2
Fig. 2 Reflectance spectra of (a) polymeric mirror and (b) white diffuse reflection film in the range of visible wavelength region. Angle of incidence is 7° where normal incidence is set to 0° and the total and diffuse reflectance were measured with detector varying the angle. Specular reflectance is calculated by the difference of total and diffuse reflectance.

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Fig. 3
Fig. 3 J-V characteristics of a cell for a DSSC cell (a) without and (b) with scattering layers. Each figure contain inset figure exhibiting IPCE versus wavelength (λ). Inset figure exhibit IPCE versus wavelength. Ref, #1, and #2 in the figure represent reference cell, polymeric mirror attached onto reference cell and white diffuse reflection film attached onto reference cell.

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Fig. 4
Fig. 4 Power coversion efficiency of DSSC with varying angle of the incident light.

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Tables (1)

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Table 1 Photocurrent-voltage characteristics of DSSC

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Equations (1)

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R = [ 1 − ( n l o w / n h i g h ) 2 m 1 − ( n l o w / n h i g h ) 2 m ] 2
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