Open AccessIdentification of Burgers vectors of threading dislocations in freestanding GaN substrates via multiphoton-excitation photoluminescence mapping
Author(s) -
Mayuko Tsukakoshi,
Tomoyuki Tanikawa,
Takumi Yamada,
Masayuki Imanishi,
Yusuke Mori,
Masahiro Uemukai,
Ryuji Katayama
Publication year - 2021
Publication title -
applied physics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.911
H-Index - 94
eISSN - 1882-0786
pISSN - 1882-0778
DOI - 10.35848/1882-0786/abf31b
Subject(s) - threading (protein sequence) , photoluminescence , excitation , materials science , photoluminescence excitation , enhanced data rates for gsm evolution , optoelectronics , dislocation , optics , crystallography , molecular physics , physics , chemistry , nuclear magnetic resonance , composite material , computer science , telecommunications , quantum mechanics , protein structure
Burgers vectors b of threading dislocations in freestanding GaN substrates were identified through statistical classification using the etch pit and multiphoton-excitation photoluminescence methods. The b = 1 a + 1 c threading mixed dislocations were propagated with large inclination angles more than four degrees from the c -axis to minimize elastic strain energy. The b = 1 c threading edge dislocations had a large contrast difference of more than 0.4 in the photoluminescence image due to their strong nonradiative properties. Based on these characteristics obtained through multiphoton-excitation photoluminescence measurements, major types of dislocations ( b = 1 a , 1 a + 1 c , 1 c ) could statistically be identified.