Abstract

We theoretically introduce a concept of two-dimensional super-quadratic subwavelength gratings (2D SQSWGs) to further investigate how geometrical shape influences the reflection behavior for biomimetic moth-eye structures, and the outline shape can be controlled by changing the degree of the grating’s profile function. Numerical studies on the reflection behavior of the 2D SQSWGs and nanorod gratings reveal that the parabola-shaped grating (degree $n=2$) with a nearly linear graded index profile has superior antireflection performance, and its average weighted reflectivity ($R_{\mathrm{ave}}$) is as low as 0.99% under AM1.5 solar illumination. Moreover, research results indicate that the 2D nanocone gratings ($n=1$) have the best angle-independent optical property. The research findings can be used to guide the design of photovoltaic cells based on biomimetic moth-eye structures, and the concept of 2D SQSWGs can be potentially applied to other photovoltaic and optical devices.

© 2019 Optical Society of America

Light-trapping schemes for silicon thin-film solar cells via super-quadratic subwavelength gratings

Ke Chen, Rui Wu, Hongmei Zheng, Haishuo Wang, Guojun Zhang, and Shunhua Chen
Appl. Opt. 58(31) 8702-8712 (2019)

Mechanically robust antireflective moth-eye structures with a tailored coating of dielectric materials

Young Jin Yoo, Yeong Jae Kim, So-Young Kim, Jong Heon Lee, Kyujung Kim, Joo Hwan Ko, Ji Won Lee, Byoung Hun Lee, and Young Min Song
Opt. Mater. Express 9(11) 4178-4186 (2019)

Optimal design for antireflective tapered two-dimensional subwavelength grating structures

Eric B. Grann, M. G. Moharam, and Drew A. Pommet
J. Opt. Soc. Am. A 12(2) 333-339 (1995)

Indium tin oxide subwavelength nanostructures with surface antireflection and superhydrophilicity for high-efficiency Si-based thin film solar cells

Jung Woo Leem and Jae Su Yu
Opt. Express 20(S3) A431-A440 (2012)

Optimization and continuous fabrication of moth-eye nanostructure array on flexible polyethylene terephthalate substrate towards broadband antireflection

Chengpeng Zhang, Peiyun Yi, Linfa Peng, and Jun Ni
Appl. Opt. 56(10) 2901-2907 (2017)