scholarly journals Improvement of the UV-Sensing Performance of Ga-Doped ZnO Nanostructures via a Wet Chemical Solution at Room Temperature

Author(s):  
Yen-Lin Chu ◽  
Sheng-Joue Young ◽  
Tung-Te Chu ◽  
Ajit Khosla ◽  
Kuei-Yuan Chiang ◽  
...  

Abstract In this investigation, ultraviolet (UV) photodetectors (PDs) were fabricated from zinc oxide (ZnO) and Ga-doped ZnO nanostructures on a Corning glass substrate by a simple wet chemical solution method at room temperature. The prepared devices contained two-dimensional (2-D) nanosheet (NS) structures, which could provide a large surface-area-to-volume ratio for UV-sensing. The ZnO and Ga-doped ZnO materials were respectively named ZPD and ZPD-G. All of the samples revealed a hexagonal wurtzite structure and grew preferentially along the (002) crystal plane. Compared with the photoluminescence (PL) spectrum of the ZPD NSs, the corresponding spectra of the ZPD-G NSs in the 380 nm region and green emission were clearly red-shifted and the number of oxygen vacancies slightly decreased. Under 380 nm UV illumination and a 3 V applied bias, the ZnO UV PDs doped with Ga elements exhibited much higher photoresponsivity and stability compared with the un-doped ZnO PDs, indicating good electrical performance. The ZPD-G samples possessed higher rise and recovery times compared with the ZPD samples; this finding could be attributed to the ability of the former to generate numerous electrons.

2017 ◽  
Vol 5 (1) ◽  
pp. 1-6
Author(s):  
Reza Zamiri ◽  
Ajay Kaushal ◽  
Avito Rebelo ◽  
Budhendra Singh ◽  
Igor Bdikin ◽  
...  

2020 ◽  
Vol 20 (6) ◽  
pp. 3913-3918 ◽  
Author(s):  
Divya Rehani ◽  
Swati Bishnoi ◽  
Manish Saxena ◽  
Shailesh Narain Sharma

The Mn, Al co-doped ZnO samples were synthesized using solid-state reaction method and were annealed in furnace at 300 °C, 600 °C and 900°C temperature. All the samples prepared were investigated in detail for analysis of their structural, morphological, optical, magnetic and electrical behavior. The XRD data confirmed the hexagonal wurtzite structure of pristine, Mn doped and Al, Mn co-doped ZnO. For morphological investigation SEM and TEM techniques were employed. The PL properties of the ZnO:Mn, Al sample revealed emission in the blue region (415–438 nm). Furthermore, IV studies were carried out to examine the conductivity of the ZnO:Mn, Al samples and maximum conductivity was found in the sample with 5% Al doping and annealing temperature 600 °C. The magnetic measurements revealed room temperature ferromagnetic behavior in the optimized ZnO:Mn, Al sample annealed at 600 °C which indicates its suitability for Magneto-Opto Electronic Applications.


2009 ◽  
Vol 11 (6) ◽  
pp. 063009 ◽  
Author(s):  
Javed Iqbal ◽  
Baiqi Wang ◽  
Xiaofang Liu ◽  
Dapeng Yu ◽  
B He ◽  
...  

RSC Advances ◽  
2016 ◽  
Vol 6 (63) ◽  
pp. 58236-58246 ◽  
Author(s):  
Hasan B. Balkhoyor ◽  
Mohammed M. Rahman ◽  
Abdullah M. Asiri

Various Ce-doped ZnO nanostructures (Ce/ZnO NSs) were prepared by a facile wet chemical method using reducing agents in alkaline medium.


2021 ◽  
Vol 44 (3) ◽  
Author(s):  
Gyanendra Pratap Singh ◽  
Abhay Kumar Aman ◽  
Rakesh Kumar Singh ◽  
M K Roy

2006 ◽  
Vol 957 ◽  
Author(s):  
Aurangzeb Khan ◽  
Wojciech M. Jadwisienczak ◽  
Saima N. Khan ◽  
Martin E. Kordesch

ABSTRACTZnO nanofibers doped with Ga, In and Er metals have been fabricated by electrospinning technique. The diameter of the fibers was in the range of 0.5-2 μm and the length can be up to several feet. After spinning fabrication step the samples were dried out and annealed at 900 °C in air. Room temperature photoluminescence (PL) spectra measured for undoped and In- and Ga-doped ZnO fiber samples exhibit only a strong near band edge (NBE) emission at ∼380 nm with very weak green band at 525 nm. In contrary, the PL spectrum of Er-doped ZnO fibers shows a very weak NBE and strong green emission band at ∼550 nm at 300 K. The electrospinning mechanism used for the fabrication of nanofibers was found to be productive, simple and easy to implement disregarding of the doping type and concentration.


Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3199
Author(s):  
Hongtao Ren ◽  
Gang Xiang

Since Dietl et al. predicted that Co-doped ZnO may show room-temperature ferromagnetism (RTFM) in 2000, researchers have focused on the investigation of ferromagnetic ZnO doped with various transition metals. However, after decades of exploration, it has been found that undoped ZnO nanostructures can also show RTFM, which in general is dependent on ZnO morphologies. Here, we will give an overall review on undoped ZnO nanomaterials with RTFM. The advanced strategies to achieve multidimensional (quasi-0D, 1D, 2D, and 3D) ferromagnetic ZnO nanostructures and the mechanisms behind RTFM are systematically presented. We have successfully prepared ferromagnetic nanostructures, including thin films, horizontal arrays and vertical arrays. The existing challenges, including open questions about quantum-bound ZnO nanostructures, are then discussed.


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