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Self-consistent 1-D Schroedinger-Poisson solver for III-V heterostructures accounting for conduction band non-parabolicity

机译:III-V异质结构的自洽一维Schroedinger-Poisson求解器,说明了导带非抛物线性

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摘要

We present in this paper a novel method to solve self-consistently the Schrodinger and Poisson's equations with non-parabolic conduction bands in Ⅲ-V heterostructures with one dimensional material and electrostatic potential variation. Our calculation suggests ~20% more sheet charge density (N_s) may be expected for a representative quantum well FET structure featuring an InCaAs channel cladded with an AlGaSb barrier, compared to predictions from the parabolic band assumption; N_s reaches >5 × 10~(12) cm~2 at 0.8 V gate overdrive. The increase in sheet density directly results in a higher FET gate capacitance and therefore better transconductance, which stems from the different density of states (DOS) function with the non-parabolic conduction band. Calculation demonstrates that non-parabolicity results in a "tilted staircase" DOS function (as opposed to the classical "flat staircase"). This model was also extended to accommodate satellite valleys, which allows the proper FET gate bias range to be determined in order to avoid overall carrier mobility drop due to L-valley occupation.
机译:我们提出了一种新颖的方法来自洽求解具有一维材料和静电势变化的Ⅲ-V异质结构中具有非抛物型导带的Schrodinger和Poisson方程。我们的计算表明,与抛物线能带假设的预测相比,具有InCaAs沟道并覆盖有AlGaSb势垒的代表性量子阱FET结构,可以预期将片电荷密度(N_s)提高约20%;在0.8 V栅极过载时,N_s达到> 5×10〜(12)cm〜2。薄层密度的增加直接导致更高的FET栅极电容,从而带来更好的跨导,这是由于非抛物线型导带的状态密度(DOS)功能不同所致。计算表明,非抛物线导致了“倾斜楼梯” DOS功能(与经典的“平坦楼梯”相对)。该模型也进行了扩展,以适应卫星谷值,从而可以确定合适的FET栅极偏置范围,以避免由于L谷占据而导致的总体载流子迁移率下降。

著录项

  • 来源
    《Solid-State Electronics》 |2010年第11期|p.1257-1262|共6页
  • 作者单位

    ECE Department, University of California, San Diego, Lajolla, CA 92093, United States;

    rnECE Department, University of California, San Diego, Lajolla, CA 92093, United States;

    rnECE Department, University of California, San Diego, Lajolla, CA 92093, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    non-parabolicity; III-V heterostructures; schroedinger-poisson;

    机译:非抛物线III-V异质结构;施罗丁格·泊松;
  • 入库时间 2022-08-18 01:34:59

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