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Improvement in electrical characteristics of HfO_2 gate dielectrics treated by remote NH3 plasma

机译:远程NH3等离子体处理HfO_2栅介质的电特性的改善

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摘要

We report the structural and electrical characteristics of hafnium oxide (HfO_2) gate dielectrics treated by remote NH_3 plasma under various radio-frequency (RF) powers at a low temperature. Significant increase of effective dielectric constant (k_(eff)), decrease of capacitance equivalent thickness (CET), reduction in leakage current density, and suppression of the interfacial layer thickness were observed with the increase of the RF power in the remote NH_3 plasma treatment. The effects of hydrogen passivation and depassivation on the HfO_2/Si interface due to the remote NH_3 plasma treatment were also observed by the variation of photoluminescence (PL) intensity, indicating that the PL measurement is applicable to probe the interfacial properties. An ultrathin interfacial layer (~0.3 nm), a high k_(eff). (20.9), a low leakage current density (9 × 10~(-6) A/cm~2), and a low CET (1.9nm) in the nitrided HfO_2 film were achieved, demonstrating that the nitridation process using remote NH_3 plasma under a high RF power at a low temperature is a promising way to improve in electrical properties of high-K gate dielectrics.
机译:我们报告了在不同的射频(RF)功率在低温下,通过远程NH_3等离子体处理的氧化ha(HfO_2)栅极电介质的结构和电气特性。随着远程NH_3等离子体处理中RF功率的增加,观察到有效介电常数(k_(eff))的显着增加,电容等效厚度(CET)的减小,漏电流密度的减小以及界面层厚度的抑制。 。通过光致发光(PL)强度的变化,还观察到了由于远程NH_3等离子体处理而导致的氢钝化和去钝化对HfO_2 / Si界面的影响,表明PL测量适用于探测界面性质。超薄界面层(〜0.3 nm),k_(eff)高。 (20.9),渗漏的HfO_2膜实现了低漏电流密度(9×10〜(-6)A / cm〜2)和低CET(1.9nm),表明使用远程NH_3等离子体进行的氮化过程在低温下以高RF功率供电是一种改善高K栅极电介质电性能的有前途的方法。

著录项

  • 来源
    《Applied Surface Science》 |2013年第1期|89-93|共5页
  • 作者单位

    Department of Materials Science and Engineering, National Taiwan University, No. I, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan;

    Department of Materials Science and Engineering, National Taiwan University, No. I, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan;

    Department of Materials Science and Engineering, National Taiwan University, No. I, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan;

    Department of Materials Science and Engineering, National Taiwan University, No. I, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan;

    Department of Materials Science and Engineering, National Taiwan University, No. I, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan;

    Institute of Electro-Optical Science and Technology, National Taiwan Normal University, Taipei, Taiwan;

    Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan, Center for Emerging Material and Advanced Devices, National Taiwan University, Taipei, Taiwan, National Nano Device Laboratories, Hsinchu 30078, Taiwan;

    Department of Materials Science and Engineering, National Taiwan University, No. I, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan, Center for Emerging Material and Advanced Devices, National Taiwan University, Taipei, Taiwan, National Nano Device Laboratories, Hsinchu 30078, Taiwan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    hafnium oxide; atomic layer deposition; nitridation; NH_3; remote plasma;

    机译:氧化原子层沉积;氮化NH_3;远程等离子体;

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