2007年
Modulation spectroscopic investigation on lattice polarity of gallium nitride
Applied Physics Letters
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- 巻
- 91
- 号
- 6
- 記述言語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1063/1.2764115
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. © 2007 American Institute of Physics.
- リンク情報
- ID情報
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- DOI : 10.1063/1.2764115
- ISSN : 0003-6951
- SCOPUS ID : 34547842633