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Quality Improvements of Titanium Oxide/Gallium Arsenide MOS Capacitors by Post-metallization Annealing and Sulfur-treatment

机译:通过后金属化退火和硫处理提高氧化钛/砷化镓MOS电容器的质量

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摘要

The characteristics of post-metallization annealed TiO_2 with various thicknesses on (NH_4)_2S-treated GaAs were investigated. The electrical characteristics of TiO_2 films grown on (NH_4)_2S-treated GaAs were improved due to the removal of native oxide. The post-metallization annealing treatment can further passivate the grain boundary of TiO_2 film and interface of TiO_2/GaAs. With both treatments, the leakage current densities of thick TiO_2 (77nm)/GaAs are 1.4 × 10~(-7) and 2.3 × 10~(-5) A/cm~2 at ± 1.5 MV/cm, and that of thin TiO_2 (7.5 nm) are 1.7 × 10~(-6) and 4.5 × 10~(-5) A/cm~2 at ± 2 V (2.7 MV/cm). The dielectric constant and equivalent oxide thickness can reach 52 and 0.53 nm, respectively. The lowest interface state density is 3.8 × 10~(12) cm~(-2)eV~(-1) by the high-low frequency capacitance method.
机译:研究了在(NH_4)_2S处理的GaAs上不同厚度的金属化后退火TiO_2的特性。由于去除了天然氧化物,在(NH_4)_2S处理的GaAs上生长的TiO_2薄膜的电学特性得到了改善。后金属化退火处理可以进一步钝化TiO_2薄膜的晶界和TiO_2 / GaAs的界面。在这两种处理下,厚的TiO_2(77nm)/ GaAs在±1.5 MV / cm时的漏电流密度分别为1.4×10〜(-7)和2.3×10〜(-5)A / cm〜2,而薄的TiO_2(7.5 nm)在±2 V(2.7 MV / cm)时为1.7×10〜(-6)和4.5×10〜(-5)A / cm〜2。介电常数和等效氧化物厚度可以分别达到52和0.53 nm。通过高低频电容法,最低的界面态密度为3.8×10〜(12)cm〜(-2)eV〜(-1)。

著录项

  • 来源
  • 会议地点 Joao Pessoa(BR);Joao Pessoa(BR)
  • 作者

    M. K. Lee; C. F. Yen; S. H. Yang;

  • 作者单位

    Department of Electrical Engineering, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan, R. O. C.;

    Department of Electrical Engineering, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan, R. O. C.;

    Department of Electrical Engineering, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan, R. O. C.;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 半导体技术;
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