نانومقیاس

نانومقیاس

تحرک الکترونی محدود توسط فونون های قطبی سطحی در گرافن

نوع مقاله : مقاله پژوهشی

نویسندگان
1 گروه فیزیک، دانشکده علوم پایه، دانشگاه بوعلی سینا، همدان
2 گروه فیزیک، دانشکده علوم، دانشگاه بوعلی سینا، همدان، ایران
چکیده
خواص ترابردی و اپتیکی عالی گرافن توجه زیادی را به کاربردهای این ماده در الکترونیک و اپتوالکترونیک نانومقیاس به خود جلب کرده است. مدوله کردن الکتروستاتیکی کانال گرافن از طریق دروازه، افزاره‌های اثرمیدان دو بعدی، نتیجه امید بخشی برای کاربردهای آنالوگ و رادیوفرکانس داشته است. این دستگاه‌ها به طور آرمانی در محدوده‌ی اشباع عمل کرده و در آن ها جریان با افزایش میدان چشمه-دررو به اشباع می‌رسد. در حالی که پراکندگی کشسان تحرک میدان پایین را تعیین می‌کند، سرعت اشباع به پراکندگی غیرکشسان توسط فونون‌های قطبی سطحی بسترهای قطبی یا فونون‌های اپتیکی گرافن ذاتی مربوط می‌شود. در این پژوهش با استفاده از معادلۀ بولتزمن و با لحاظ فونون آکوستیکی و فونون اپتیکی سطحی، اثرات ناخالصی کولنی و پراکندگی فونون قطبی سطحی مورد بررسی قرار گرفته است، هم چنین تحرک الکترون ‌ها به ترتیب بر حسب دما و چگالی آن‌ها، برای بسترهای HfO2، Al2O3، ZrO2، محاسبه و رسم شده است. نتایج به دست آمده در توافق با داده های تجربی و نظری اخیر است.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Electron mobility limited by surface polar phonons in graphene

نویسندگان English

Ghassem Ansaripour 1
َAhmad Al-Jadiri 2
1 Department of Physics, Faculty of Science, Bu-Ali Sina University, Hamedan
2 Department of Physics, Faculty of Science, Bu-Ali Sina University, Hamedan, Iran
چکیده English

Abstract: The excellent transport and optical properties of graphene have attracted much attention for possible application of this material in nanoscale electronics and optoelectronics. Electrostatics modulation of the graphene channel through the gates results in promising two-dimensional field effect for analogue and radiofrequency applications. These devices ideally act in the limits of saturation and their current is saturated by increasing the source-drain field. While elastic scattering determines low field mobility, the saturation velocity is related to inelastic scattering by surface polar phonon of polar substrates or intrinsic graphene optical phonons. In this study, using the Boltzmann equation and with viewpoint acoustic phonon and surface optical phonon, the effects of Coulomb impurity and surface polar phonon scattering, have been investigated. Also, the mobility of electrons calculated and plotted in terms of temperature and their density respectively, for the substrates HfO2, Al2O3 and ZrO2. The obtained results are in agreement with recent experimental and theoretical data.

کلیدواژه‌ها English

Surface polar phonon
Graphene
Inelastic scattering
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دوره 12، شماره 1
بهار 1404
صفحه 1-10

  • تاریخ دریافت 26 آبان 1403
  • تاریخ بازنگری 19 دی 1403
  • تاریخ پذیرش 03 بهمن 1403