Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 22, Issue 9, Pages 595-597Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2010.2042950
Keywords
a-plane; basal stacking faults (BSFs); gallium nitride; light-emitting diode (LED); nonpolar
Funding
- IT RD program [2009-F-022-01]
- Ministry of Knowledge Economy [10030797]
- Korea Institute of Industrial Technology(KITECH) [10030797] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We report on the effects of basal stacking faults (BSFs) on the electrical anisotropy and the device characteristics of nonpolar a-plane GaN (11 (2) over bar0) light-emitting diodes (LEDs) on r-plane (1 (1) over bar 02) sapphire substrates. The sheet resistance in the direction parallel to the c-axis [0001] is 18%-70% higher than the one in the direction parallel to the m-axis [1 (1) over bar 00]. The anisotropic conductivity of faulted a-plane GaN films can be explained by carrier scatterings from BSFs. It is also shown that the output power of nonpolar a-plane GaN LEDs are significantly influenced by the presence of BSFs, which laterally hampers the carrier transport in the n-GaN layer, especially in the direction parallel to the c-axis in faulted nonpolar nitride films.
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