In this study, zinc oxide (ZnO) films were deposited on sapphire substrates using a plasma-enhanced atomic layer deposition system. Prior to deposition, the substrates were treated with hydrogen peroxide (H2O2) in order to increase nucleation on the initial sapphire surface and, thus, enhance the quality of deposited ZnO films. Furthermore, x-ray diffraction spectroscopy measurements indicated that the crystallinity of ZnO films was considerably enhanced by H2O2 pretreatment, with the strongest (002) diffraction peak occurring for the film pretreated with H2O2 for 60min. X-ray photoelectron spectroscopy also was used, and the results indicated that a high number of Zn-O bonds was generated in ZnO films pretreated appropriately with H2O2. The ZnO film deposited on a sapphire substrate with H2O2 pretreatment for 60min was applied to metal-semiconductor-metal ultraviolet photodetectors (MSM-UPDs) as an active layer. The fabricated ZnO MSM-UPDs showed improvements in dark current and ultraviolet-visible rejection ratios (0.27μA and 1.06×103, respectively) compared to traditional devices.
|Journal||Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films|
|Publication status||Published - 2016 Jan 1|
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Surfaces and Interfaces
- Surfaces, Coatings and Films