Theoretical simulations are necessary to scientifically progress, envisage and gain the first hand knowledge of the properties of semiconductor quantum dot (QD) structure. The impact of dual ternary-quaternary/quaternary-ternary capping layers on the square based truncated pyramidal InAs QD and their influence on the energy band structure as well as the strain profile has been investigated in this study. A comparative analysis has been demonstrated with binary, ternary and quaternary capping layer counterparts. The capping layers are: GaAs (binary), InGaAs/GaAs (ternary), InAlGaAs/GaAs (quaternary), InGaAs/InAlGaAs/GaAs (dual ternary-quaternary) and InAlGaAs/InGaAs/GaAs (dual quaternary-ternary). The hydrostatic and biaxial strain for all the heterostructures have also been computed and compared. The biaxial strain was highest for the QD capped with InAlGaAs/GaAs and InAlGaAs/InGaAs/GaAs, leading to the red shift of the ground state emission in the photoluminescence (PL) spectrum. The possible absorption peaks were also calculated for all QDs from the electron (EL) and hole (HL) eigenstates. The lowest energy transition (EL1-HL1) at 300 K is near to the communication wavelength for the optimum (InAlGaAs/InGaAs/GaAs capped) QD, which is at 1.35 µm. The optimized QD heterostructure claimed the highest electrostatic potential of 0.4986 V. This study will be helpful in predicting few optical and electrical characteristics based on the strain distribution inside the structure. The optimized QD structure having a consistent strain profile inside it would render superior luminescence characteristics. Finally, to verify the accuracy of the simulation, the simulated transition peaks at 19 K and 300 K were validated with the experimental PL data, and the percentage error was within 5%.
Journal of Luminescence – Elsevier
Published: May 1, 2018
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.
All for just $49/month
Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly
Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.
Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.
Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.
All the latest content is available, no embargo periods.
“Hi guys, I cannot tell you how much I love this resource. Incredible. I really believe you've hit the nail on the head with this site in regards to solving the research-purchase issue.”Daniel C.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud
“I must say, @deepdyve is a fabulous solution to the independent researcher's problem of #access to #information.”@deepthiw
“My last article couldn't be possible without the platform @deepdyve that makes journal papers cheaper.”@JoseServera