Ray-optics study of gentle non-conformal texture morphologies for perovskite/silicon tandems
R. Santbergen (TU Delft - Photovoltaic Materials and Devices)
M.R. Vogt (TU Delft - Photovoltaic Materials and Devices)
Ryota Mishima (Kaneka Corporation, KANEKA Belgium N.V.)
Masashi Hino (Kaneka Corporation)
Hisashi Uzu (Kaneka Corporation)
Daisuke Adachi (Kaneka Corporation)
Kenji Yamamoto (Kaneka Corporation)
M. Zeman (TU Delft - Photovoltaic Materials and Devices, TU Delft - Electrical Sustainable Energy)
O. Isabella (TU Delft - Photovoltaic Materials and Devices)
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Abstract
We investigate gentle front side textures for perovskite/silicon tandem solar cells. These textures enhance the absorption of sunlight, yet are sufficiently gentle to allow deposition of an efficient perovskite top cell. We present a tandem solar cell with such gentle texture, fabricated by Kaneka corporation, with an efficiency as high as 28.6%. We perform an extensive ray-optics study, exploring non-conformal textures at the front and rear side of the perovskite layer. Our results reveal that a gentle texture with steepness of only 23° can be more optically efficient than conventional textures with more than double that steepness. We also show that the observed anti-reflective effect of such gentle textures is not based a double bounce, but on light trapping by total internal reflection. As a result, the optical effects of the encapsulation layers play an important role, and have to be accounted for when evaluating the texture design for perovskite/silicon tandems.
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