Design of patterned sapphire substrates for GaN-based light-emitting diodes<xref ref-type="fn" rid="cpb150397fn1">*</xref>

Design of patterned sapphire substrates for GaN-based light-emitting diodes*

Wang Hai-Yan^a), Lin Zhi-Ting^a), Han Jing-Lei^a), Zhong Li-Yi^a), Li Guo-Qiang^a),^b)

SEM images of the grooved PSS: (a) straight,^{[ 35 ]} (b) slanted,^{[ 27 ]} and (c) V-shaped grooves.^{[ 27 ]}