Identification of Burgers vectors of threading dislocations in freestanding GaN substrates via multiphoton-excitation photoluminescence mapping | Zendy

Mayuko Tsukakoshi | Zendy; Tomoyuki Tanikawa | Zendy; Takumi Yamada | Zendy; Masayuki Imanishi | Zendy; Yusuke Mori | Zendy; Masahiro Uemukai | Zendy; Ryuji Katayama | Zendy

Open Access

Identification 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) - photoluminescence , threading (protein sequence) , excitation , materials science , photoluminescence excitation , dislocation , enhanced data rates for gsm evolution , band gap , optoelectronics , burgers vector , crystallography , optics , molecular physics , chemistry , physics , nuclear magnetic resonance , composite material , telecommunications , quantum mechanics , protein structure , computer science

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.

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