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Effect of thermal annealing on the cathodoluminescence of evaporated CdS films |
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| Affiliation: | 1. Central Research Laboratory, Recep Tayyip Erdogan University, 53100 Rize, Turkey;2. Department of Physics, Nigde Omer Halisdemir University, Merkez, 51240 Nigde, Turkey;3. Department of Physics, Karadeniz Technical University, Merkez, 61080 Trabzon, Turkey;4. Department of Physics, Recep Tayyip Erdogan University, 53100 Rize, Turkey;1. Department of Materials Science and Engineering, Faculty of Engineering, Adana Alparslan Türkeş Science and Technology University, Adana 01250, Turkey;2. Department of Materials Science and Engineering, Institute of Graduate Studies, Adana Alparslan Türkeş Science and Technology University, Adana 01250, Turkey;3. Department of Physics, Faculty of Arts and Sciences, Recep Tayyip Erdogan University, Rize, Turkey;4. Department of Energy Systems Engineering, Of Faculty of Technology, Karadeniz Technical University, Trabzon, Turkey;5. Department of Physics, Faculty of Sciences, Karadeniz Technical University, Trabzon, Turkey |
| Abstract: | Cathodoluminescence (CL) of evaporated undoped CdS films was investigated before and after thermal annealing in air and in vacuum at 300 °C for several hours. Pure CdS single crystals were studied for comparison. CL spectra were obtained at room temperature using the electron microprobe technique. The two well-known (green and red) CL bands of pure CdS were observed for all samples. Annealing of the films in air decreased the green luminescence while vacuum annealing led to its increase. The red luminescence increased under both annealing conditions. The results were explained in terms of radiative transitions attributed mainly to native defects and their complexes. The role of oxygen and residual impurities on the CL of thin films was discussed. A modulation of the CL spectra was obtained in thin films owing to optical interference. |
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