نویسنده
پژوهشکده فیزیک کاربردی و ستاره‌شناسی، دانشگاه تبریز
چکیده
از آنجا که قسمت عمده اتلاف اساسی در سلول خورشیدی با نوار میانی، اتلاف گرمایی است، این مقاله به مطالعه و بررسی آن پرداخته است. ساختار مورد مطالعه، سلول خورشیدی p-i-n با جنس AlP < sub>ySb(1-y) است که آرایه‌ای منظم از نقاط کوانتومی هرمی مربع‌القاعده از جنس InAs(1-x)Nx در ناحیه ذاتی آن به‌منظور تشکیل نوار میانی قرار گرفته است. نوار میانی ایجاد شده که از نظر الکتریکی ایزوله است، باعث تقسیم گاف انرژی سلول خورشیدی به دو زیرگاف انرژی می‌شود. محاسبه اتلاف گرمایی منوط به دانستن مقدار انرژی این زیرگاف‌ها است. بنابراین، برای محاسبه آنها، ابتدا موقعیت انرژی مینی‌نوار با حل معادله شرودینگر سه‌بعدی برای سلول واحد متشکل از یک نقطه کوانتومی به‌روش المان محدود محاسبه می‌شود. سپس، پهنای مینی‌نوار با محاسبه ضریب جذب به‌دست می‌آید. درنهایت، با بررسی اثر غلظت مولی نیتروژن و فسفر، اندازه نقاط کوانتومی و فاصله بین آنها، مقدار کمینه اتلاف گرمایی برای ساختار بهینه سلول خورشیدی گفته شده به‌دست می‌آید.
کلیدواژه‌ها
عنوان مقاله [English]
Optimization of Thermalisation Loss in the Quantum Dot Solar Cells using a Finite Element Method
نویسنده [English]
- Z. Arefinia
چکیده [English]
As thermalisation loss is the dominant loss process in the quantum dot intermediate band solar cells (QD-IBSCs), it has been investigated and calculated for a QD-IBSC, where IB is created by embedding a stack of InAs(1-x) Nx QDs with a square pyramid shape in the intrinsic layer of the AlP < sub>ySb(1-y) p-i-n structure. IB, which is an optically coupled but electrically isolated mini-band, divides the total band gap of AlP < sub>ySb(1-y) into two sub-band gaps. To obtain the thermalisation loss of AlP < sub>ySb(1-y)/InAs(1-x)Nx QD-IBSCs, the position and width of IB in the band gap of AlP < sub>ySb(1-y) should be calculated. The position of IB, which is equal to the first eigen-energy of a unit cell of QD, is obtained by solving the 3D Schrödinger equation with a finite-element method and the width of IB is obtained by the absorption characteristics. Then, with the investigation of the effect of nitrogen and phosphorous molar fraction, QDs size and the distance between the QDs on the thermalisation loss, the minimized loss for the optimized structure of AlP < sub>ySb(1-y)/InAs(1-x)Nx QD-IBSCs is obtained
کلیدواژه‌ها [English]
- Intermediate band
- Thermalization loss
- Quantum dot
- solar cell
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