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TitleElucidation of the unsymmetrical effect on the piezoelectric and semiconducting properties of Cd-doped 1D-ZnO nanorods
AuthorYuvasree Purusothaman,a Nagamalleswara Rao Alluri,b Arunkumar Chandrasekhara and Sang-Jae Kim*a
Affiliation(s)a Nanomaterials and System Lab, Department of Mechatronics Engineering, Jeju National University, Jeju 690-756, Republic of Korea E-mail: kimsangj@jejunu.ac.kr Fax: +82-64-756-3886 Tel: +82-64-754-3715 b Faculty of Applied Energy System, Department of Mechanical Engineering, Jeju National University, Jeju 690-756, Republic of Korea
PublishedJ. Mater. Chem 06 Dec 2016 DOI: 10.1039/C6TC04592H
Keywordmulti-wavelength LED
Snippet... The photo-responsive IV measurements were recorded using a semiconductor device parameter analyzer (Agilent-B1500A) with the help of a Prizmatix multi-wavelength LED light source operated at wavelengths of 365 nm, 405 nm and 535 nm at different intensities. ...
AbstractHerein, we report the unsymmetric effect on the functional (piezoelectric and semiconducting) properties of cadmium-doped 1D-ZnO nanorods (NRs), which have a higher ionic radius (0.97 Å). The growth of Cd-ZnO NRs, which have a hexagonal wurtzite structure without any secondary CdO phases, along the c-axis was confirmed by the XRD patterns, and oxidation states observed from XPS analyses verified the diffusion of Cd2+ into ZnO NRs. A one-fold reduction in the piezoelectric properties was determined by the fabrication of a nanogenerator, and enhancement in the semiconducting properties was studied using an Ag/Cd-ZnO NRs/Ag device with various wt% of Cd doped into the ZnO NRs lattice. Cd-ZnO NRs improve the photogenerated charge carriers (Iph ∼ 330 μA) compared to pure ZnO NRs (Iph ∼ 213 μA), obtained at a bias voltage of 10 V, a wavelength of 365 nm and a light intensity of 8 mW cm−2. The Cd-ZnO NRs (1 wt%) based sensor shows good photoresponse with a detectivity (D*) limit of 1 × 1011 cm H1/2 W−1 compared to that of pure ZnO NRs (D* = 5.4 × 1010 cm H1/2 W−1). We also demonstrate a self-powered UV sensor (SPUV-S) connected parallel to the ZnO NRs based nanogenerator as an independent power source to drive the Cd-ZnO NRs UV sensor. The low-temperature hydrothermal synthesis of Cd-ZnO NRs is simple, cost-effective, and scalable for industrial applications.

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