Role of various dielectric environment matrices of InP/ZnS core/shell quantum dot on optical gain coefficient
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THE EUROPEAN PHYSICAL JOURNAL D
Regular Article
Role of various dielectric environment matrices of InP/ZnS core/shell quantum dot on optical gain coefficient Muthukani Elamathi1 , Amalorpavam John Peter2,a , and Chang Woo Lee3,b 1 2 3
Dept. of Physics, Saiva Bhanu Kshatriya College, Aruppukkottai 626101, India P.G. and Research Dept. of Physics, Government Arts College, Melur, 625 106 Madurai, India Department of Chemical Engineering, College of Engineering, Kyung Hee University, 1732 Deogyeong-daero, Gihung, Yongin, Gyeonggi 446-701, South Korea Received 19 February 2020 / Accepted 13 August 2020 Published online 1 October 2020 c EDP Sciences / Societ`
a Italiana di Fisica / Springer-Verlag GmbH Germany, part of Springer Nature, 2020 Abstract. Theoretical studies on excitonic and optical properties of a single exciton confined in an InP/ZnS heterostructure core/shell quantum dot embedded in various dielectric environments are investigated. The energies are found with and without the inclusion of dielectric mismatch employing single band effective mass approximation using variational formulism. The solution of Poisson-Schr¨ odinger wave equations for the attractive term between the electron and hole is carried out using a self consistent approach in the Hartree approximation. The binding energy due to an exciton and oscillator strength is found with the effect of geometrical confinement. The total absorption coefficients, the injection current density for the optical output and the corresponding threshold optical pump intensity studied in the presence of various dielectric environments are investigated in the InP/ZnS heterostructure core/shell quantum dot. The ratio of core/shell hetero-structured quantum dot radius for various values of dielectric matrices immersed is found. The results show that the obtained properties are considerably enhanced with the incorporation of dielectric environment matrices immersed in the core/shell quantum dot particularly the highest dielectric constant will bring out the better results. It is hoped that to the present study will contribute the understanding of excitonic and optical properties in the group II–VI core/shell heterostructure quantum dots for the potential applications in photovoltaic and light emitting diodes.
1 Introduction Among all reduced dimensional semiconductor systems, quantum dots are given quite attention in the research fields of nanophysics due to their potential applications in opto-electronic devices [1–3]. Any quantum dot which is surrounded by another semiconductor, varying from 10 nm to 100 nm, is generally known as a core/shell quantum dot which possesses distinct electronic and photonic properties. This core/shell material shows the improvement of light harvesting properties especially with the high energy photons. This setup of core/shell quantum dot which is immersed in various dielectric environments’ so called matrix materials is used in order to stabilize the nano-heterostucture quantum dots [4–6]. Generally, some dielectric materials such
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