هیدروفیزیک

هیدروفیزیک

طراحی آشکارساز امواج مادون قرمز با استفاده از یک سیستم شامل دونقطه کوانتومی کروی درون کره کوانتومی آلاییده به کمک حل معادله پواسون - شرودینگر

نوع مقاله : مقاله پژوهشی

نویسندگان
1 دانشجوی دکترا، دانشگاه پیام نور، تهران، ایران
2 دانشگاه شیراز
3 گروه فیزیک،دانشگاه پیام نور، تهران، ایران
چکیده
ساختارهای کوانتومی نیمه‌هادی به عنوان یکی از منابع پیشرفته در تولید نور می‌باشند و اعمال آلایش به آنها باعث تحول در خصوصیات الکترونی و الکترواپتیکی آنها می‌گردد، لذا بررسی خصوصیات آنها از اهمیت ویژه‌ای برخوردار است و در سالهای اخیر به عنوان یک موضوع پژوهشی نو و دارای کاربردهای فراوان مورد توجه دانشمندان و صنعتگران قرار گرفته است. در این مطالعه خصوصیات الکترونی و در نتیجه خصوصیات نوری دو نقطه کوانتومی کروی از جنس ایندیوم آرسناید درون کره کوانتومی گالیوم آرسناید مورد بررسی قرار گرفته است. برای رسیدن به این هدف ابتدا معادله شرودینگر در ساختارهای ذکر شده با روش المان محدود و تقریب جرم موثر مورد بررسی قرارگرفت و نتایج حاصله مانند ویژه توابع و ویژه مقادیر انرژی و سایر ویژگی‌های به دست آمده با نتایج حاصل از کارهای مشابه تحلیلی مقایسه شده است. سپس با تزریق مقادیر مختلف ناخالصی و استفاده از معادله خود سازگار پواسون – شرودینگر، اثر ناخالصی‌ها بر خصوصیات الکترونی و نوری ساختار مورد بررسی و با نتایج حاصل از حل معادله شرودینگر در شرایط حدی مقایسه گردید. نرم افزار استفاده شده در این بررسی کامسول می‌باشد. نتایج به دست آمده حاکی از تاثیر مقادیر ناخالصی آلاییده شده و شعاع‌های نانو ساختارهای درونی بر خصوصیات فیزیکی این نانو ساختار می‌باشد. بدین ترتیب با تغییر پارامتر‌های مطرح شده، امکان محاسبه اختلاف انرژی اولین حالت برانگیخته و حالت پایه فراهم می‌شود. محاسبات نشان می‌دهد که با توجه به این اختلاف انرژی امکان طراحی آشکارسازهای مادون قرمز با بازه نسبتا وسیع فراهم می‌شود.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Electronic properties of two spherical quantum dot confined in the doped quantum sphere by solving the Poisson-Schrodinger equation

نویسندگان English

Mohammad Reza Farahmand 1
Mahmood Moradi 2
Abolrasol Gharaati 3
1 Ph.D. student, Physics Department , Payame Noor University, Tehran, Iran
2 Physics Department., Shiraz University
3 Physics Department , Payame Noor University, Tehran, Iran
چکیده English

Semiconductor quantum structures are one of the advanced sources in light production, and applying impurities to them causes changes in their electronic and electro-optical properties, so investigating their properties is of particular importance. The title of a new research subject with many applications has attracted the attention of scientists and industrialists. In this study, the electronic properties of a spherical quantum dot made of gallium arsenide and two spherical quantum dots made of indium arsenide inside the gallium arsenide quantum sphere have been investigated. First Schrödinger's equation was investigated in the mentioned structures by using finite element method and effective mass approximation. The obtained results such as eigenfunctions and energy eigenvalues and other physical properties have been compared with the results obtained from previous similar works. Then, the effect of impurities on the electronic properties by using the self-consistent Poisson-Schrödinger equation, has been obtained and compared with the results of solving the Schrödinger equation in boundaries conditions. The software used in this review is Comsol. The obtained results indicate that the effect of impurity and the radii of the internal nanostructures on the electronic properties of the nanostructure are significant. As a result, by changing the mentioned parameters, it is possible to calculate the energy difference between the first excited state and the ground state. Results show that according to energy difference, it is possible to design infrared detectors with a relatively wide range.

کلیدواژه‌ها English

Detector
Quantum sphere
Self-consistent equation
Finite element method
Electronic properties
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  • تاریخ دریافت 24 دی 1402
  • تاریخ بازنگری 22 بهمن 1402
  • تاریخ پذیرش 07 اسفند 1402