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Publication Type : Journal Article
Publisher : Indian Journal of Science and Technology
Source : Indian Journal of Science and Technology. Volume 9, Issue 36, September 2016.
Keywords : Dark Current, Non-Equilibrium Green’s Function, Quantum Dot Photodetectors, Theoretical Modeling
Campus : Chennai
School : School of Engineering
Center : Research & Projects
Department : Physics, Sciences, Civil
Verified : Yes
Year : 2016
Abstract : Objectives: This paper entails the theoretical computation of dark current in asgrown and annealed Quantum Dot Infrared Photodetectors (QDIP). Methods/Statistical analysis: Here, non-equillibrium Green’s function was used to model the dark current characteristics in asgrown and annealed QDIPs. Post-growth thermal annealing, which reduces the traps states in the QD is also simulated using Fick’s second law of diffusion. We have developed a selfconsistent Poisson’s equation solver to compute the potential profile and quasi Fermi level at QD and at the contacts. Findings: The theoretically computed dark current obtained from our model is in good agreement with the experimental data, which validates the efficacy of our model. Our computation also predicts decrease in dark current in the QD with increase in annealing temperature at low bias voltage from0.25-1.5 volts. Application/ Improvements: Here, we have optimized the dark current for different annealing temperatures for improving the performance of QD device for infrared sensing applications
Cite this Research Publication : Rahul Kumar Gujaral, V.Damodaran, Kaustab Ghosh. "A theoretical analysis of the dark current in quantum dot infrared photodetector using non-equilibrium Green's function model", Indian Journal of Science and Technology. Volume 9, Issue 36, September 2016.