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A theoretical analysis of dark current in quantum dot infrared photodetector using non-equilibrium Green’s function model

Publication Type : Journal Article

Publisher : Indian Journal of Science and Technology

Source : Indian Journal of Science and Technology, Volume 9, Issue 36, 2016

Url : https://indjst.org/articles/a-theoretical-analysis-of-the-dark-current-in-quantum-dot-infrared-photodetector-using-nonequilibrium-greens-function-model

Campus : Chennai

School : School of Engineering

Department : Electronics and Communication

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 and Kaustab Ghosh. “A theoretical analysis of dark current in quantum dot infrared photodetector using non-equilibrium Green’s function model”, Indian Journal of Science and Technology, Volume 9, Issue 36, 2016

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