Optical design of spectrally selective interlayers for perovskite/silicon heterojunction tandem solar cells

Monolithic perovskite/c-Si tandem solar cells have the potential to exceed the Shockley-Queisser limit for single junction solar cells. However, reflection losses at internal interfaces play a crucial role for the overall efficiency of the tandem devices. Significant reflection losses are caused by...

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Bibliographic Details
Published inOptics express Vol. 26; no. 18; pp. A750 - A760
Main Authors Bittkau, K, Kirchartz, T, Rau, U
Format Journal Article
LanguageEnglish
Published United States 03.09.2018
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Summary:Monolithic perovskite/c-Si tandem solar cells have the potential to exceed the Shockley-Queisser limit for single junction solar cells. However, reflection losses at internal interfaces play a crucial role for the overall efficiency of the tandem devices. Significant reflection losses are caused by the charge selective contacts which have a significantly lower refractive index compared to the absorber materials. Here, we present an approach to overcome a significant part of these reflection losses by introducing a multilayer stack between the top and bottom cell which shows spectrally selective transmission/reflection behavior. The layer stack is designed and optimized by optical simulations using transfer matrix method and a genetic algorithm. The incident sun light is split into a direct part and an isotropic diffuse part. The tandem solar cell with interlayer shows an absolute improvement of short-circuit current density of 0.82 mA/cm .
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ISSN:1094-4087
1094-4087
DOI:10.1364/OE.26.00A750