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|Title:||Bipolar charge storage characteristics in copper and cobalt co-doped zinc oxide (ZnO) thin film|
Kelvin probe force microscopy
|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|
|Appears in Collections:||Staff Publications|
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