Journal ArticleDOI
Stable bipolar surface potential behavior of copper-doped zinc oxide films studied by Kelvin probe force microscopy
TLDR
In this article, the surface potential of undoped and copper-doped zinc oxide (ZnO:Cu) films has been studied using the Kelvin probe force microscopy at ambient condition.Abstract:
The surface potential of undoped and copper-doped zinc oxide (ZnO:Cu) films has been studied using the Kelvin probe force microscopy at ambient condition. In contrast to the undoped ZnO with unipolar behavior, the ZnO:Cu film exhibits a bipolar surface potential behavior under a dc bias. The localized hole trapping phenomenon is attributed to the presence of Cu ions in ZnO films. With an appropriate amount of the Cu ions (∼8 at. %), the charge trapping is reasonably stable over a period of 20 h, which can be associated with the presence of oxygen vacancies. This coexistence of Cu ions and oxygen vacancies in ZnO gives rise to stable bipolar behavior, paving way to potential charge storage application.read more
Citations
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Journal ArticleDOI
Dynamics of Photogenerated Surface Charge on BiFeO3 Films
TL;DR: Variations in the surface potential with bias voltage, switching history, and illumination intensity indicate how both bulk ferroelectric photovoltaic and the domain wall offset potential mechanisms contribute to the photogenerated charge.
Journal ArticleDOI
In-situ nanoscale mapping of surface potential in all-solid-state thin film Li-ion battery using Kelvin probe force microscopy
Jing Zhu,Kaiyang Zeng,Li Lu +2 more
TL;DR: In this article, the effect of bias-induced Li+ insertion/extraction on the changes of surface potential of TiO2 anode in an all-solid-state thin film Li-ion battery at nanoscale was investigated.
Journal ArticleDOI
Improving the electrical performance of resistive switching memory using doping technology
Yan Wang,Yan Wang,Qi Liu,HangBing Lü,Shibing Long,Wei Wang,Yingtao Li,Yingtao Li,Sen Zhang,Wentai Lian,Jianhong Yang,Ming Liu +11 more
TL;DR: In this article, three doping technologies with Ti ions, Cu, and Cu nanocrystal, respectively, are adopted in the experiments to improve the electrical performance of resistive random access memory (RRAM).
Journal ArticleDOI
Tuning of multifunctional Cu-doped ZnO films and nanowires for enhanced piezo/ferroelectric-like and gas/photoresponse properties
TL;DR: A one-step aqueous synthesis of Cu-doped ZnO nanostructured materials with effective controllability over the morphology (film to nanowire) and doping concentrations both on rigid and flexible substrates has been developed.
Journal ArticleDOI
Enhancement of ZnO-based flexible nano generators via a sol-gel technique for sensing and energy harvesting applications.
TL;DR: A flexible piezoelectric nanogenerator device was fabricated using an unpretentious solution process of spin coating, with other advantages such as robustness, low-weight, improved adhesion, and low cost, and exhibited a novel energy harvesting technique from a wind source due to its inherent flexibility.
References
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Journal ArticleDOI
A comprehensive review of zno materials and devices
Ümit Özgür,Ya. I. Alivov,C. Liu,A. Teke,Michael A. Reshchikov,Seydi Doğan,Vitaliy Avrutin,Sang-Jun Cho,Hadis Morkoç +8 more
TL;DR: The semiconductor ZnO has gained substantial interest in the research community in part because of its large exciton binding energy (60meV) which could lead to lasing action based on exciton recombination even above room temperature.
Journal ArticleDOI
Oxygen vacancies in ZnO
TL;DR: Vlasenko and Watkins as mentioned in this paper showed that the oxygen vacancy VO is not a shallow donor, but has a deep e(2+∕0) level at ∼10eV below the conduction band.
Journal ArticleDOI
Ferromagnetism of ZnO and GaN: A Review
C. Liu,F. Yun,Hadis Morkoç +2 more
TL;DR: In this article, a review of the recent progress in the theoretical and experimental studies of ZnO-and GaN-based DMSs is presented, focusing on the structural, optical, and magnetic properties of these materials.
Journal ArticleDOI
Local potential and polarization screening on ferroelectric surfaces
TL;DR: In this paper, the authors applied electron microscopy and scanning surface potential microscopy to study force gradient and surface potential on the surface of a double layer due to the complete screening of polarization charge.
Journal ArticleDOI
Room-Temperature Ferromagnetism of Cu-Doped ZnO Films Probed by Soft X-Ray Magnetic Circular Dichroism
Tun Seng Herng,Dongchen Qi,Tom Berlijn,Tom Berlijn,Jiabao Yi,Kesong Yang,Kesong Yang,Ying Dai,Yuan Ping Feng,Iman Santoso,Cecilia Sanchez-Hanke,Xingyu Gao,Andrew T. S. Wee,Wei Ku,Wei Ku,Jun Ding,Andrivo Rusydi +16 more
TL;DR: It is found that a sufficient amount of both oxygen vacancies (V(O)) and Cu impurities is essential to the observed ferromagnetism, and a non-negligible portion of Cu impurity is uninvolved in the magnetic order.