Theoretical Analysis of Direct Transition in SiGe/GeSn Strained Quantum Well Structure by Finite Difference Method

  • Prakash Pareek
  • Mukul K. Das
Conference paper
Part of the Springer Proceedings in Physics book series (SPPHY, volume 166)


This paper focuses on the potential of compressive strained group IV quantum well (QW) structure in photo sensitive devices specially photodetectors. Direct absorption characteristic in compressive strained SiGe/GeSn QW is determined with the help of Schrödinger equation. The Schrödinger equation for Г-valley, Heavy hole band and Light hole band is solved by finite difference method (FDM). Due to compressive strain, heavy hole (HH) band pushes upwards and light hole (LH) band lowers on addition of Sn concentration. Absorption coefficient of QW is evaluated by using Fermi’s golden rule. Result shows that significant absorption is obtained in short wave infrared range. HH to conduction band transition provides greater absorption than LH to conduction band transition. Result also shows that compressive strained GeSn become direct band gap in nature for Sn concentration greater than 0.15 (15 %).


Quantum Well Finite Difference methodFinite Difference Method Heavy Hole Light Hole Quantum Well Structure 
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Copyright information

© Springer India 2015

Authors and Affiliations

  1. 1.UGC SAP Research Laboratory, Department of Electronics EngineeringIndian School of MinesDhanbadIndia

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