Research Papers

Intraband optical transition energy in type-I group II to VI spherical quantum dots

[+] Author Affiliations
Christina Lily Jasmine Paul

NMS Sermathai Vasan College for Women, Department of Physics, Madurai 625-012, India

John Peter Amalorpavam

Government Arts College, PG and Research Department of Physics, Melur, Madurai 625-106, India

Chang Woo Lee

Kyung Hee University, College of Engineering, Department of Chemical Engineering, 1732 Deogyeong-daero, Gihung, Yongin, Gyeonggi 446-701, Republic of Korea

J. Nanophoton. 9(1), 093069 (Jun 23, 2015). doi:10.1117/1.JNP.9.093069
History: Received February 14, 2015; Accepted May 20, 2015
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Abstract.  Electronic properties and intersub-band optical transition energies are studied in group II to VI wide band gap semiconductors taking into account the geometrical confinement of the core and shell materials. ZnS/CdS, ZnS/CdSe, and CdS/CdSe are some group II to VI core/shell semiconducting materials, which are considered in the present work. The effects of internal electric field, due to spontaneous and piezoelectric polarization, are taken into consideration in the calculations. The dielectric-mismatch effect and the position-dependent effective mass are included in the Hamiltonian. The electronic properties are studied using the variational method and the optical properties are considered using the density matrix approach. All the properties are discussed for various ratios of core and shell radii of the materials in the strong confinement region. The effect of geometrical confinement on the Coulomb interaction energies in the core/shell materials is found. The oscillator strength is computed for these core/shell materials and the optical absorption coefficient as a function of photon energy is investigated in the strong and weak confinement regions. The result shows that the electronic and optical properties are dominant in the strong confinement region.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Christina Lily Jasmine Paul ; John Peter Amalorpavam and Chang Woo Lee
"Intraband optical transition energy in type-I group II to VI spherical quantum dots", J. Nanophoton. 9(1), 093069 (Jun 23, 2015). ; http://dx.doi.org/10.1117/1.JNP.9.093069


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