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Tseng, Yao Tien; Choudhury, Amrita; Peng, Kun Cheng; Chen, Jyh Herng; Chou, Cheng Tung; Lin, Jing Chie
Electrochimica acta, 06/2019, Letnik: 308Journal Article
In this study, an electrochemical deposition was conducted to prepare Al:ZnO. Products in three distinct phases were obtained depending on the Al3+ added in the bath of 2.0 mM zinc nitrate. For convenient description, Al3+ (total range 0–1000 μM) was termed as dilute (i.e., Al3+ < 60 μM), medium (i.e. 60 μM < Al3+ < 100 μM), and concentrated (i.e., Al3+ > 250 μM). Field-emission scanning electron microscopy revealed that a compact phase of nanorods was deposited in the dilute Al3+, a mixed phase consisting of nanorods and nanosheets was deposited in the medium Al3+, and a loose phase of cloudy floc was produced in the concentrated Al3+. By analyzing the reaction products with grazing incidence X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy, we distinguished the crystal film of aluminum-doped zinc oxide nanorods from the amorphous hydroxides. Mott-Schottky measurements revealed that the specimen of nanorods doped with 2.84 at.% Al displays the highest carrier concentration (3.83 × 1018 cm−3) and demonstrates the highest electric conductivity among the specimens in a compact phase of nanorods. Photovoltaic tests showed that these films have fill factor and solar cell power conversion efficiency of 70.6 and 2.15%, respectively. By means of cathodic polarization and analysis of basic chemistry in aqueous solution, we propose a comprehensive mechanism to illustrate the type of products depending on Al3+.
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Leto | Faktor vpliva | Izdaja | Kategorija | Razvrstitev | ||||
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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