Shape Dependent Optical Properties of GaAs Quantum Dot: A Simulation Study

Authors K.D. Kadam1, S.L. Patil2, H.S. Patil1, P.P. Waifalkar2, K.V. More3, R.K. Kamat4 , T.D. Dongale1

1Computational Electronics and Nanoscience Research Laboratory, School of Nanoscience and Biotechnology, Shivaji University, Kolhapur-416004, India

2Department of Physics, Shivaji University, Kolhapur-416004, India

3Department of Chemistry, Shivaji University, Kolhapur-416004, India

4Department of Electronics, Shivaji University, Kolhapur-416004, India

Issue Volume 11, Year 2019, Number 1
Dates Received 18 October 2018; revised manuscript received 04 February 2019; published online 25 February 2019
Citation K.D. Kadam, S.L. Patil, H.S. Patil, et al., J. Nano- Electron. Phys. 11 No 1, 01013 (2019)
PACS Number(s) 61.46.Df, 73.21.La, 78.67.−n
Keywords Quantum dot (12) , Optical properties (22) , GaAs (22) , Simulation (35) .

The present paper deals with the simulation study of the GaAs quantum dot with different shapes such as cuboid, cylinder, dome, cone, and pyramid. We have simulated various structures and investigated the shape dependent optical properties using open source simulation tool available on the NanoHub platform. This simulation tool can simulate the simple as well as multilayer zero-dimensional structures by solving Schrödinger equations. The results suggested that the energy states vary according to the shape and higher energy states are observed for cone-shaped whereas, cuboid shape shows lower energy states for zero-dimensional structure. Furthermore, optical simulation study suggested that the cuboid and cylinder shapes show maximum absorption whereas, minimum absorption is observed for the dome-shape. The higher absorption is due to the higher surface area of cuboid and cylinder shape, whereas, the insufficient polarization angle of the incident light lowers the absorption for the dome shape structure. Furthermore, the absorption property is not significantly altered during different temperature environments. The integrated absorption results suggested that the cuboid and cylinder shapes have higher absorption whereas, minimum integrated absorption is observed for the cone and pyramid shape zero-dimensional structures. The present results pave the way towards optimization of various parameters of quantum dot for optoelectronic applications.

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