Journal
OPTICS EXPRESS
Volume 18, Issue 13, Pages A133-A138Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.18.00A133
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Funding
- German Federal Ministry of Education and Research [03SF0322H]
- German Research Foundation [RA 473/6-1]
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A directionally selective multilayer filter is applied to a hydrogenated amorphous silicon solar cell to improve the light trapping. The filter prevents non-absorbed long-wavelength photons from leaving the cell under oblique angles leading to an enhancement of the total optical path length for weakly absorbed light within the device by a factor of kappa(r) = 3.5. Parasitic absorption in the contact layers limits the effective path length improvement for the photovoltaic quantum efficiency to a factor of kappa(EQE) = 1.5. The total short-circuit current density increases by Delta J(sc) = 0.2 mAcm (2) due to the directional selectivity of the Bragg-like filter. (C) 2010 Optical Society of America 130.7408 Wavelength filtering devices
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