3 years ago

Nanophotonic Light Management for Perovskite-Silicon Tandem Solar Cells.

S. Albrecht, M. Hammerschmidt, P. Tockhorn, P. Manley, K. Jäger, C. Becker, G. Köppel, D. Eisenhauer, S. Burger, D. Chen

Perovskite-silicon tandem solar cells are currently one of the most investigated concepts to overcome the theoretical limit for the power conversion efficiency of silicon solar cells. For monolithic tandem solar cells the available light must be distributed equally between the two subcells, which is known as current matching. For a planar device design, a global optimization of the layer thicknesses in the peroskite top cell allows current matching to be reached and reflective losses of the solar cell to be minimized at the same time. However, even after this optimization reflection and parasitic absorption losses occur which limit the matched short circuit current density by 7 mA/cm2.

In this contribution we use numerical simulations to study, how well hexagonal sinusoidal nanotextures in the perovskite top-cell can reduce the reflective losses of the combined tandem device. We investigate three configurations. For a nanotexture with period of 500 nm and peak-to-valley height of 500 nm, the short circuit current density in each cell could be increased by more than 1.5 mA/cm2 with respect to the planar reference. In a first attempt to experimentally realize such nanophotonically engineered perovskite solar cells for monolithic tandems, we investigate the morphology of perovskite layers, which are deposited onto sinusoidally structured substrates.

Publisher URL: http://arxiv.org/abs/1801.07252

DOI: arXiv:1801.07252v1

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