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https://doi.org/10.1021/am301220h
Title: | Bipolar charge storage characteristics in copper and cobalt co-doped zinc oxide (ZnO) thin film | Authors: | Kumar, A. Herng, T.S. Zeng, K. Ding, J. |
Keywords: | bipolar charge charge stability codoped ZnO Kelvin probe force microscopy zinc oxide |
Issue Date: | 24-Oct-2012 | Citation: | Kumar, A., Herng, T.S., Zeng, K., Ding, J. (2012-10-24). Bipolar charge storage characteristics in copper and cobalt co-doped zinc oxide (ZnO) thin film. ACS Applied Materials and Interfaces 4 (10) : 5276-5280. ScholarBank@NUS Repository. https://doi.org/10.1021/am301220h | Abstract: | The bipolar charge phenomenon in Cu and Co co-doped zinc oxide (ZnO) film samples has been studied using scanning probe microscopy (SPM) techniques. Those ZnO samples are made using a pulsed laser deposition (PLD) technique. It is found that the addition of Cu and Co dopants suppresses the electron density in ZnO and causes a significant change in the work function (Fermi level) value of the ZnO film; this results in the ohmic nature of the contact between the electrode (probe tip) and codoped sample, whereas this contact exhibits a Schottky nature in the undoped and single-element-doped samples. These results are verified by Kelvin probe force microscopy (KPFM) and ultraviolet photoelectron spectroscopy (UPS) measurements. It is also found that the co-doping (Cu and Co) can stabilize the bipolar charge, whereas Cu doping only stabilizes the positive charge in ZnO thin films. © 2012 American Chemical Society. | Source Title: | ACS Applied Materials and Interfaces | URI: | http://scholarbank.nus.edu.sg/handle/10635/59644 | ISSN: | 19448244 | DOI: | 10.1021/am301220h |
Appears in Collections: | Staff Publications |
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