A comparative study of Dots-in-a-Double-Well (DDWELL) heterostructures with SK, SML and coupled SK-on-SML as active region

Archishman Saha; Neelu Neelu; Ravindra Kumar; Saranya Reddy Shriram; Subhananda Chakrabarti

doi:10.1117/12.2633251

3 October 2022 A comparative study of Dots-in-a-Double-Well (DDWELL) heterostructures with SK, SML and coupled SK-on-SML as active region

Archishman Saha, Neelu Neelu, Ravindra Kumar, Saranya Reddy Shriram, Subhananda Chakrabarti

Author Affiliations +

Proceedings Volume 12200, Low-Dimensional Materials and Devices 2022; 122000C (2022) https://doi.org/10.1117/12.2633251
Event: SPIE Nanoscience + Engineering, 2022, San Diego, California, United States

Conference Poster

Abstract

A comparative study of Stranski-Krastanov (SK), sub-monolayer (SML) and coupled SK on SML InAs quantum dots as active region in InGaAs/GaAs/AlGaAs DDWELL heterostructure was done. Incorporation of additional high band gap confinement enhancing (CE) Al_xGa_1-xAs barrier helps to create new energy levels, increase the absorption coefficient, reduce dark current and improve crystalline quality of the heterostructure. This is because of the CE barrier which reduces In-adatom out-diffusion. Three different DDWELL heterostructure A, B and C with active regions as SK, SML and SK on SML respectively, had been modelled using the Nextnano simulation tool keeping all other parameters same. Photoluminescence (PL) emission wavelength, biaxial strains and hydrostatic strain profiles of heterostructures A, B and C were compared. Hydrostatic strain with less magnitude leads to better carrier confinement within the conduction band, and biaxial strain with high magnitude increases splitting between heavy-hole and light- hole bands, generating a red-shift in PL emission wavelength. It can be observed from the computed result that biaxial and hydrostatic strain in the SK QD are enhanced in structure C compared to A. Likewise, biaxial strain and hydrostatic strain in the SML QD stacks are enhanced in structure C compared to B. PL emission wavelength of structures A, B, and C were observed to be 1116nm, 864nm and 1170nm respectively. Therefore, structure C exhibits minimum strain among the heterostructures and highest PL emission wavelength for SWIR applications.

Conference Presentation

Citation Download Citation

Archishman Saha, Neelu Neelu, Ravindra Kumar, Saranya Reddy Shriram, and Subhananda Chakrabarti "A comparative study of Dots-in-a-Double-Well (DDWELL) heterostructures with SK, SML and coupled SK-on-SML as active region", Proc. SPIE 12200, Low-Dimensional Materials and Devices 2022, 122000C (3 October 2022); https://doi.org/10.1117/12.2633251

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available