کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1784666 1023271 2009 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Computer modeling of MWIR single heterojunction photodetector based on mercury cadmium telluride
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک اتمی و مولکولی و اپتیک
پیش نمایش صفحه اول مقاله
Computer modeling of MWIR single heterojunction photodetector based on mercury cadmium telluride
چکیده انگلیسی

In the present paper, an abrupt heterojunction photodetector based on Hg1 − xCdxTe (MCT) has been simulated theoretically for mid-infrared applications. A semi-analytical simulation of the device has been carried out in order to study the performance ratings of the photodetector for operation at room temperature. The energy band diagram, carrier concentration, electric field profile, dark current, resistance–area product, quantum efficiency and detectivity have been calculated and optimized as a function of different parameters such as device thickness, applied reverse voltage and operating wavelength. The effect of energy band offsets in conduction and valance band on the transportation of minority carriers has been studied. The influences of doping concentration, electron affinity gradient and the p–n junction position within heterostructure on potential barrier have been analyzed. The optical characterization has been carried out in respect of quantum efficiency, and detectivity of the heterojunction photodetector. In present model the Johnson–Nyquist and shot noise has been considered in calculation of detectivity. The simulated results has been compared and contrasted with the available experimental results. Results of our analytical-cum-simulation study reveal that under suitable biasing condition, the photodetector offers a dark current, ID ≈ 6.5 × 10−12 A, a zero-bias resistance–area product, R0A ≈ 11.3 Ω m2, quantum efficiency, η ≈ 78%, NEP = 2 × 10−12 W Hz1/2 and detectivity D∗ ≈ 4.7 × 1010 mHz1/2/W.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Infrared Physics & Technology - Volume 52, Issue 5, September 2009, Pages 196–203
نویسندگان
, ,