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Characterization of silicon-on-insulator wafers.

机译:绝缘体上硅晶片的特性。

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摘要

The silicon-on-insulator (SOI) is attracting more interest as it is being used for an advanced complementary-metal-oxide-semiconductor (CMOS) and a base substrate for novel devices to overcome present obstacles in bulk Si scaling. Furthermore, SOI fabrication technology has improved greatly in recent years and industries produce high quality wafers with high yield. This dissertation investigated SOI material properties with simple, yet accurate methods. The electrical properties of as-grown wafers such as electron and hole mobilities, buried oxide (BOX) charges, interface trap densities, and carrier lifetimes were mainly studied. For this, various electrical measurement techniques were utilized such as pseudo-metal-oxide-semiconductor field-effect-transistor (PseudoMOSFET) static current-voltage (I-V) and transient drain current (I-t), Hall effect, and MOS capacitance-voltage/capacitance-time (C-V/C-t). The electrical characterization, however, mainly depends on the pseudo-MOSFET method, which takes advantage of the intrinsic SOI structure. From the static current-voltage and pulsed measurement, carrier mobilities, lifetimes and interface trap densities were extracted. During the course of this study, a pseudo-MOSFET drain current hysteresis regarding different gate voltage sweeping directions was discovered and the cause was revealed through systematic experiments and simulations.;In addition to characterization of normal SOI, strain relaxation of strained silicon-on-insulator (sSOI) was also measured. As sSOI takes advantage of wafer bonding in its fabrication process, the tenacity of bonding between the sSOI and the BOX layer was investigated by means of thermal treatment and high dose energetic gamma-ray irradiation. It was found that the strain did not relax with processes more severe than standard CMOS processes, such as anneals at temperature as high as 1350 degree Celsius.
机译:绝缘体上硅(SOI)吸引了越来越多的兴趣,因为它被用于先进的互补金属氧化物半导体(CMOS)和新型器件的基础衬底,以克服在大规模Si缩放方面遇到的障碍。此外,近年来,SOI制造技术已大大改善,并且工业以高产量生产高质量的晶片。本文采用简单而准确的方法研究了SOI材料的性能。主要研究了已生长的晶片的电学性质,例如电子和空穴迁移率,掩埋氧化物(BOX)电荷,界面陷阱密度和载流子寿命。为此,利用了各种电测量技术,例如伪金属氧化物半导体场效应晶体管(PseudoMOSFET)静态电流-电压(IV)和瞬态漏极电流(It),霍尔效应以及MOS电容-电压/电容时间(CV / Ct)。但是,电气特性主要取决于伪MOSFET方法,该方法利用了本征SOI结构的优势。从静态电流-电压和脉冲测量中,提取出载流子迁移率,寿命和界面陷阱密度。在本研究过程中,发现了有关不同栅极电压扫描方向的伪MOSFET漏电流滞后,并通过系统实验和仿真揭示了其原因。;除了表征正常的SOI之外,应变硅衬底上的应变松弛还测量了绝缘体(sSOI)。由于sSOI在其制造过程中利用了晶片键合的优势,因此通过热处理和高剂量高能伽马射线辐照研究了sSOI和BOX层之间的键合强度。已经发现,在比标准CMOS工艺更严格的工艺中,例如在高达1350摄氏度的温度下进行退火时,应变不会松弛。

著录项

  • 作者

    Park, Ki Hoon.;

  • 作者单位

    Arizona State University.;

  • 授予单位 Arizona State University.;
  • 学科 Engineering Electronics and Electrical.;Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 124 p.
  • 总页数 124
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;工程材料学;
  • 关键词

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