Enhanced light trapping in thin-film solar cells by a directionally selective filter 21 June 2010 / Vol. 18, No. 102 / OPTICS EXPRESS Carolin Ulbrich, 1,* Marius Peters, 2 Benedikt Bläsi, 2 Thomas Kirchartz, 1 Andreas Gerber, 1 and Uwe Rau 1
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Enhanced light trapping in thin-film solar cells by a directionally selective filter
21 June 2010 / Vol. 18, No. 102 / OPTICS EXPRESS
Carolin Ulbrich,1,* Marius Peters,2Benedikt Bläsi,2
Thomas Kirchartz,1 Andreas Gerber,1and Uwe Rau1
1IEF5 - Photovoltaik, ForschungszentrumJülich, 52425Jülich, Germany
2Fraunhofer-Institut fürSolareEnergiesysteme,Heidenhofstraße 2, 79110 Freiburg, Germany
Advisor : H.C. Kuo / C.C. Lin
Student : H.W. Han
Thickness : 322 nm ; Corning glass with etched ZnO:Al
650nm < λ < 770nm due to the directional selectivity of the filter suppressing re-emission of non-absorbed light
350nm < λ < 650nm due to the antireflective properties of the filter
short-circuit current densities Jsc : 13.40 mAcm−2 13.66 mAcm−2
κr represents a factor quantifying the additional light path prolongation in the device.
The large difference between the improvement factor κEQE and κr is due to parasitic absorption in the TCO and at the back contact.
the external quantum efficiency EQEfi of a 414nm thick
a-Si:H solar cell (prepared on Corning glass)
The dashed line is calculated from Eq. using λ0 = 767nm and λ1 = 600nm.
Thanks for your attention!! directionally selective filter