Modulation spectroscopic investigation on lattice polarity of gallium nitride

Ryuji Katayama, Kentaro Onabe, Hiroyuki Yaguchi, Tomonori Matsushita, Takashi Kondo

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14 Citations (Scopus)

Abstract

A lattice polarity determination method for GaN is demonstrated, which is based on a capability of modulation spectroscopy for the assignment of electric-field directions performed nondestructively using simple optical setups. A strong spontaneous polarization induces an upward band bending toward +c surfaces and a downward but weaker bending toward -c surfaces for typical films with small residual strains and electron densities. This difference is distinguishable in terms of the spectral-phase flip, utilizing photoreflectance, and electroreflectance. Quantitative analysis revealed the exciton dissociation at a high-field region of +c surfaces consistent with the band profile derived as a solution of Poisson equation.

Original languageEnglish
Article number061917
JournalApplied Physics Letters
Volume91
Issue number6
DOIs
Publication statusPublished - 2007 Aug 17

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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    Katayama, R., Onabe, K., Yaguchi, H., Matsushita, T., & Kondo, T. (2007). Modulation spectroscopic investigation on lattice polarity of gallium nitride. Applied Physics Letters, 91(6), [061917]. https://doi.org/10.1063/1.2764115