Structural and optical properties of CdTe-nanocrystals thin films grown by chemical synthesis |
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| Affiliation: | 1. Departamento de Física, CINVESTAV-IPN, Apdo. Postal 14-740, México D.F. 07360, Mexico;2. Facultad de Química, Materiales, Universidad Autónoma de Querétaro, Querétaro, Mexico;3. Escuela Superior de Ingeniería Química e Industrias Extractivas, Instituto Politécnico Nacional, México D.F., Mexico;4. Escuela Superior de Ingeniería y Arquitectura del IPN, México D.F., Mexico;5. Escuela Superior de Física y Matemáticas del IPN, México D.F. 07738, Mexico;1. Materials Science Laboratory, School of Physics, Vigyan Bhawan, Devi Ahilya University, Khandwa Road Campus, Indore 452001, India;2. Acropolis Technical Campus, Near Tillore Village, Rala Mandal, Indore 452020, India;3. Indore Institute of Science and Technology, Pithampur Road, Rau, Indore 453331, India |
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| Abstract: | By mans of a chemical synthesis technique stoichiometric CdTe-nanocrystals thin films were prepared on glass substrates at 70 °C. First, Cd(OH)2 films were deposited on glass substrates, then these films were immersed in a growing solution prepared by dissolution of Te in hydroxymethane sulfinic acid to obtain CdTe. The structural analysis indicates that CdTe thin films have a zinc-blende structure. The average nanocrystal size was 19.4 nm and the thickness of the films 170 nm. The Raman characterization shows the presence of the longitudinal optical mode and their second order mode, which indicates a good crystalline quality. The optical transmittance was less than 5% in the visible region (400–700 nm). The compositional characterization indicates that CdTe films grew with Te excess. |
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| Keywords: | CdTe thin films CdTe nanocrystals Te excess Chemical synthesis |
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