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Enhancing light harvesting in organic solar cells with pyramidal rear reflectors
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Image of FIG. 1.

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FIG. 1.

(Color online) Schematic illustration of (a) the overall design of an organic solar cell with a pyramidal rear reflector (not to scale), (b) the semi-transparent organic solar cell (which corresponds to the circled area in (a)), and (c) device fabrication procedures. Here, TP = transparent polymer.

Image of FIG. 2.

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FIG. 2.

Current density-voltage (J-V) characteristics of small area P3HT:PCBM solar cells under 1 sun simulated AM 1.5G solar illumination for devices with planar or pyramidal reflectors. Devices with a pyramidal reflector were aligned either with the center or edge of the pyramid. Inset: Intensity distribution for the reflected light (second pass) within the active layer over the pyramid base area (1 × 1 cm2).

Image of FIG. 3.

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FIG. 3.

(Color online) Enhancement in the short-circuit current density, f, as a function of the active layer thickness ta for small area devices (2 × 2 mm2) aligned to the center or edge of the pyramid. Symbols represent experimental data while the lines are calculation results. Inset: Schematic illustration of light passes in devices with a planar or pyramidal rear reflector.

Image of FIG. 4.

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FIG. 4.

(Color online) (a) Enhancement in the short-circuit current density, f, as a function of the active layer thickness ta for large area devices (1 × 1 cm2). Symbols represent experimental data and lines correspond to calculations with either existing (Calc. 1) or ideal (Calc. 2) geometry and optical properties for the pyramids; (b) optical transmittance (T) for the ITO electrode, OMO trilayer, and the TP and the reflectance (R) of the OMO trilayer as a function of wavelength, λ.

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/content/aip/journal/apl/99/2/10.1063/1.3609870
2011-07-14
2014-04-17

Abstract

We report enhanced light absorption in semi-transparent organic solar cells by using pyramidal rear reflectors to induce light trapping in the photoactive layer. Pyramidal rear reflectors with a base angle of 30° were molded from a transparent polymer on planar substrates. Compared with a planar rear reflector, the pyramidal structure leads to a more than 2.5 times longer path length in the active layer for the incident light. Experimental demonstration showed an 11%–75% enhancement in the photocurrent and overall efficiency of the solar cells, depending on the device size and active layer thickness.

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Scitation: Enhancing light harvesting in organic solar cells with pyramidal rear reflectors
http://aip.metastore.ingenta.com/content/aip/journal/apl/99/2/10.1063/1.3609870
10.1063/1.3609870
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