Abstract

A broadband and omnidirectional absorber based on an asymmetric multi-cavity resonance is presented, which is realized by adapting a lossless silicon nitride layer on top, a sandwiched amorphous silicon layer, and a silver mirror at the bottom. Its average optical absorption is 0.92 (0.87, experiment) for wavelengths from 400 nm to 700 nm and still over 0.84 (0.80, experiment) with the incident angle up to 60°. In addition, the developed absorber is suitable for large-scale applications, since only the deposition method is involved in its fabrication. Furthermore, photophysical properties of this absorber for a solar cell device are investigated, where high short-circuit current density and photo-conversion efficiency are obtained, even with the amorphous silicon layer thinning to 22 nm. Therefore, the demonstrated absorber has great application potential in the solar cell.

© 2018 Optical Society of America

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