Quantum Confinement in Cadmium Selenide Multilayer Thin Films Using Physical Vapour Deposition Method
Nanocrystals of CdSe have been produced in SiOx matrix layer and in ZnSe heterostructure layer by thermal evaporation method. Structural studies were done by X-ray diffractometer. Quantum confinement effect of CdSe nanocrystals was analyzed from optical studies. Bulk CdSe has band-gap energy of 1.75...
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| Format: | Article |
| Language: | English |
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Sumy State University
2012-06-01
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| Series: | Журнал нано- та електронної фізики |
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| Online Access: | http://jnep.sumdu.edu.ua/download/numbers/2012/2/articles/jnep_2012_V4_02021.pdf |
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| author | M. Melvin David Kumar Suganthi Devadason S. Rajesh |
| author_facet | M. Melvin David Kumar Suganthi Devadason S. Rajesh |
| author_sort | M. Melvin David Kumar |
| collection | DOAJ |
| description | Nanocrystals of CdSe have been produced in SiOx matrix layer and in ZnSe heterostructure layer by thermal evaporation method. Structural studies were done by X-ray diffractometer. Quantum confinement effect of CdSe nanocrystals was analyzed from optical studies. Bulk CdSe has band-gap energy of 1.756 eV that can be shifted to larger values by reducing the crystal size to dimensions smaller than the Bohr radius of the exciton. Experimentally measured band-gap shifts with respect to the bulk value for quantum dot thin films are compared with the predictions of the effective mass approximation model (i.e., Brus model) and Quantum mechanical model. Sizes of the crystallites calculated from both models were coincident with each other. |
| format | Article |
| id | doaj-art-1cd20a5708d740cea3fa323fe5ba5b81 |
| institution | Kabale University |
| issn | 2077-6772 |
| language | English |
| publishDate | 2012-06-01 |
| publisher | Sumy State University |
| record_format | Article |
| series | Журнал нано- та електронної фізики |
| spelling | doaj-art-1cd20a5708d740cea3fa323fe5ba5b812025-08-20T03:54:51ZengSumy State UniversityЖурнал нано- та електронної фізики2077-67722012-06-0142020211Quantum Confinement in Cadmium Selenide Multilayer Thin Films Using Physical Vapour Deposition MethodM. Melvin David KumarSuganthi DevadasonS. RajeshNanocrystals of CdSe have been produced in SiOx matrix layer and in ZnSe heterostructure layer by thermal evaporation method. Structural studies were done by X-ray diffractometer. Quantum confinement effect of CdSe nanocrystals was analyzed from optical studies. Bulk CdSe has band-gap energy of 1.756 eV that can be shifted to larger values by reducing the crystal size to dimensions smaller than the Bohr radius of the exciton. Experimentally measured band-gap shifts with respect to the bulk value for quantum dot thin films are compared with the predictions of the effective mass approximation model (i.e., Brus model) and Quantum mechanical model. Sizes of the crystallites calculated from both models were coincident with each other.http://jnep.sumdu.edu.ua/download/numbers/2012/2/articles/jnep_2012_V4_02021.pdfMultilayer thin filmsQuantum ConfinementCdSeZnSeSiO |
| spellingShingle | M. Melvin David Kumar Suganthi Devadason S. Rajesh Quantum Confinement in Cadmium Selenide Multilayer Thin Films Using Physical Vapour Deposition Method Журнал нано- та електронної фізики Multilayer thin films Quantum Confinement CdSe ZnSe SiO |
| title | Quantum Confinement in Cadmium Selenide Multilayer Thin Films Using Physical Vapour Deposition Method |
| title_full | Quantum Confinement in Cadmium Selenide Multilayer Thin Films Using Physical Vapour Deposition Method |
| title_fullStr | Quantum Confinement in Cadmium Selenide Multilayer Thin Films Using Physical Vapour Deposition Method |
| title_full_unstemmed | Quantum Confinement in Cadmium Selenide Multilayer Thin Films Using Physical Vapour Deposition Method |
| title_short | Quantum Confinement in Cadmium Selenide Multilayer Thin Films Using Physical Vapour Deposition Method |
| title_sort | quantum confinement in cadmium selenide multilayer thin films using physical vapour deposition method |
| topic | Multilayer thin films Quantum Confinement CdSe ZnSe SiO |
| url | http://jnep.sumdu.edu.ua/download/numbers/2012/2/articles/jnep_2012_V4_02021.pdf |
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