Influence of Cu2+ dopant in optical property of CdTe quantum dots and photoelectrochemical performance of CdTe:Cu2+/TiO2 nanotube arrays |
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| Institution: | 1. Department of Physics, University of the Free State (QwaQwa campus), Private Bag X-13, Phuthaditjhaba 9866, South Africa;2. Departments of Chemistry, University of the Western Cape, Private Bag X17, Bellville 7535, South Africa;1. Physics Department, Faculty of Science, Arak University, Arak 38156, Iran;2. Physics Department, Faculty of Science, Yazd University, Yazd 89195-741, Iran;1. Departamento de Física de la Materia and Instituto de Microscopía Electrónica y Materiales (IMEYMAT), Universidad de Cádiz, Puerto Real, Cádiz, Spain;2. Lobaton Clinic, S.L.P, Avenida Fernández Ladreda 9, Cádiz, Spain;3. Department of Biomedicine, Biotechnology and Public Health (Immunology), University of Cadiz and Puerto Real University Hospital Research Unit, School of Medicine, Cádiz, Spain |
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| Abstract: | A novel one-step synthesis process was used to prepare CdTe:Cu2+/TiO2 nanotube arrays (TNTAs). X-ray powder diffraction and high-resolution transmission electron microscopy analyses confirmed that the obtained CdTe:Cu2+ quantum dots (QDs) possess cubic structures, which are approximately spherical, and a small particle size (2.95 nm). The photoluminescent and UV–visible absorption spectra of CdTe:Cu2+ QDs also display an obvious redshift, which was attributed to the replacement of Cd2+ with Cu2+. Compared with that of the TNTAs and CdTe/TNTAs, the photoelectric conversion efficiency of CdTe:5% Cu2+/TNTAs increased by 785.7% and 103.3%, respectively. The incident photo-to-current conversion efficiency of CdTe:5% Cu2+/TNTAs was 50.6%, which indicated the potential use of QDs in photochemical solar cells. |
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| Keywords: | Quantum dots Tunable band gap One-step synthesis Electrochemical properties |
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