Effect of varying facet angle on the strain and energy band profile of InAs QD heterostructures

Ravindra Kumar; Jhuma Saha; Subhananda Chakrabarti

doi:10.1117/12.2555912

1 April 2020 Effect of varying facet angle on the strain and energy band profile of InAs QD heterostructures

Ravindra Kumar, Jhuma Saha, Subhananda Chakrabarti

Proceedings Volume 11345, Nanophotonics VIII; 113452Y (2020) https://doi.org/10.1117/12.2555912
Event: SPIE Photonics Europe, 2020, Online Only

Abstract

We have investigated the effects of varying facet angle of the truncated pyramidal QDs on the strain and energy band profile. The conventional truncated QD pyramid has a height of 3 nm with the facet angle of 51˚ along with base and top width of 15 and 11 nm respectively, as observed from the previously reported transmission electron microscopy images. Also, the simulated results were validated with reported experimental data for reliability of our work. Five different angle variations viz. 41˚, 45˚, 51˚, 56˚, 61˚ were considered, referred as structure A, B, C, D and E. It is observed that the magnitude of hydrostatic strain is reduced by 1.22% for the structure E (facet angle of 61˚) and increased by 1.507% for structure A (facet angle of 41˚), when compared with the conventional structure C. Therefore, the carrier confinement would be better in case of structure E as compared to its counterparts. In comparison to structure C, the biaxial strain is 1.39% higher and 2.203% lower in case of structure E and A respectively. Higher biaxial strain would inculcate red shift in emission wavelength because of the movement of heavy-holes upward in energy, which is reflected from the computed photoluminescence peaks. The emission wavelength obtained for structures A, B, C, D and E were approximately 1140, 1151, 1155, 1161 and 1183 nm respectively. Thus, among all, structure E offered longest emission wavelength and optimum strain distribution within the heterostructure.

Conference Presentation

Citation Download Citation

Ravindra Kumar, Jhuma Saha, and Subhananda Chakrabarti "Effect of varying facet angle on the strain and energy band profile of InAs QD heterostructures", Proc. SPIE 11345, Nanophotonics VIII, 113452Y (1 April 2020); https://doi.org/10.1117/12.2555912

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