Abstract

Crystalline silicon thin-film solar cells with period-mismatched sine dual-interface gratings are proposed. Several structural parameters of the front and rear gratings, such as heights, periods, and duty ratios, are optimized using the finite-difference time-domain method. The mechanisms of absorption enhancement are also illustrated by analyzing the optical and electrical performance in thin-film solar cells with different grating arrangements. Numerical results indicate that the period-mismatched sine dual-interface grating structure shows obvious improvement in absorption efficiency and is more suitable for grating structures with small period. The short-circuit current density of the period-mismatched dual-interface sine grating structure is improved to ${18.89}\;{{{\rm mA}/{\rm cm}}^2}$, an increase of 41.39% as compared with the planar structure. The research findings can be utilized to guide the design of grating structures for thin-film solar cells.

© 2020 Optical Society of America

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