Comparative PL study of individual ZnO nanorods,grown by APMOCVD and CBD techniques |
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| Authors: | Volodymyr Khranovskyy Rositza Yakimova Fredrik Karlsson Abdul S Syed Per-Olof Holtz Zelalem Nigussa Urgessa Oluwatobi Samuel Oluwafemi Johannes Reinhardt Botha |
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| Institution: | 1. Department of Physics, Chemistry and Biology (IFM), Linköping University, 58183 Linköping, Sweden;2. Department of Physics, P.O Box 77000, Nelson Mandela Metropolitan University, Port Elizabeth 6031, South Africa;3. Department of Chemistry and Chemical Technology, Walter Sisulu University, Mthatha Campus, Private Bag XI 5117, South Africa |
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| Abstract: | The photoluminescence properties of individual ZnO nanorods, grown by atmospheric pressure metalorganic chemical vapor deposition (APMOCV) and chemical bath deposition (CBD) are investigated by means of temperature dependent micro-PL. It was found that the low temperature PL spectra are driven by neutral donor bound exciton emission D0X, peaked at 3.359 and 3.363 eV for APMOCVD and CBD ZnO nanorods, respectively. The temperature increase causes a red energy shift of the peaks and enhancement of the free excitonic emission (FX). The FX was found to dominate after 150 K for both samples. It was observed that while APMOCVD ZnO nanorods possess a constant low signal of visible deep level emission with temperature, the ZnO nanorods grown by CBD revealed the thermal activation of deep level emission (DLE) after 130 K. The resulting room temperature DLE was a wide band located at 420–550 nm. The PL properties of individual ZnO nanorods can be of importance for their forthcoming application in future optoelectronics and photonics. |
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| Keywords: | ZnO nanorods APMOCVD CBD UV photoluminescence DLE |
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