Ray-optics study of gentle non-conformal texture morphologies for perovskite/silicon tandems

Rudi Santbergen*, Malte R. Vogt, Ryota Mishima, Masashi Hino, Hisashi Uzu, Daisuke Adachi, Kenji Yamamoto, Miro Zeman, Olindo Isabella

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)
23 Downloads (Pure)


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.

Original languageEnglish
Pages (from-to)5608-5617
Number of pages10
JournalOptics Express
Issue number4
Publication statusPublished - 2022


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