Optical properties of m-plane GaN grown on patterned Si(112) substrates by MOCVD using a two-step approach

Optical properties of m-plane GaN grown on patterned Si(112) substrates by MOCVD using a two-step approach
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使用两步法通过 MOCVD 在图案化 Si(112) 衬底上生长的 m 面 GaN 的光学特性

DOI:
10.1117/12.2037930
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发表时间:
2014
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影响因子:
--
通讯作者:
H. Morkoç
H. Morkoç
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--
文献类型:
--
作者:
N. Izyumskaya;S. Okur;F. Zhang;M. Monavarian;V. Avrutin;Ü. Özgür;S. Metzner;C. Karbaum;F. Bertram;J. Christen;H. Morkoç

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采用金属有机化学气相沉积(MOCVD)技术在图像化Si(112)衬底上生长了非极平面GaN层。采用低压(30 Torr)和高压(200 Torr)两步生长工艺,第一步确保它们形成平面面,第一步提高光学质量。两步生长的层的光学质量得到了改善:近波段光致发光强度比低压生长的层高3倍左右,深发射明显减弱。但是,与相同条件下生长的极性和半极性参考样品(1 100)相比,- gan的发射强度仍然较低。为了揭示这一问题,利用空间分辨阴极发光和近场扫描光学显微镜研究了非极性GaN/Si的c+和c -翼的光发射空间分布。
Nonpolarm-plane GaN layers were grown on patterned Si (112) substrates by metal-organic chemical vapor deposition (MOCVD). A two-step growth procedure involving a low-pressure (30 Torr) first step to ensure formation of them-plane facet and a high-pressure step (200 Torr) for improvement of optical quality was employed. The layers grown in two steps show improvement of the optical quality: the near-bandedge photoluminescence (PL) intensity is about 3 times higher than that for the layers grown at low pressure, and deep emission is considerably weaker. However, emission intensity fromm-GaN is still lower than that of polar and semipolar (1 100 ) reference samples grown under the same conditions. To shed light on this problem, spatial distribution of optical emission over the c+and c−wings of the nonpolar GaN/Si was studied by spatially resolved cathodoluminescence and near-field scanning optical microscopy.
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