Synthesis of mesoporous ZnO, AZO, and BZO transparent conducting films using nonionic triblock copolymer as template
MATERIALS LETTERS
Authors: Ueno, Naoyuki; Dwijaya, Bram; Uchida, Yoshiaki; Egashira, Yasuyuki; Nishiyama, Norikazu
Abstract
Mesoporous zinc oxide (ZnO), Al-doped ZnO (AZO) and B-doped ZnO (BZO) thin films were synthesized by a sol-gel method using nonionic triblock copolymer (Pluronic F127: EO106PO70EO106) as a soft template agent. Electrical and optical properties of the ZnO, AZO, and BZO films were investigated. Mesoporous ZnO films calcined at 500 degrees C showed a strong peak in the XRD pattern, showing a periodic distance of 12.8 nm. The visible light transmittance of the films ranged from 50% to more than 90% by changing the Zn/EO molar ratio in precursor solutions. The electric resistivity of the films was decreased by doping the optimum amount of Al or B atom. The minimum value of the BZO film was 0.024 Omega cm which can be obtained at the atomic ratio of B/Zn=0.005. (C) 2013 Elsevier B.V. All rights reserved.
Surface morphology and microstructure of Sm1+xBa2-xCu3Oy thin films including self-organized columnar pinning centers
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
Authors: Ozaki, T.; Yoshida, Y.; Ichino, Y.; Harada, T.; Takai, Y.; Matsumoto, K.; Ichinose, A.; Horii, S.; Mukaida, M.; Kita, R.
Abstract
We investigated the influence of the BZO nanorods on the surface morphologies of conventional PLD-SmBCO film and the SmBCO film prepared by a low-temperature growth (LTG) technique, developed by us as a novel crystal growth method. Dynamic force microscope (DFM) images showed that growth modes in SmBCO including BZO nanorods films were transformed from spiral growth mode into the 2D nucleation and growth mode. Moreover, observations using the DFM showed growth steps of the PLD- and LTG-SmBCO. Plan-view transmission electron microscope (TEM) images suggested that the BZO pinned the growth of the SmBCO layer. (C) 2009 Elsevier B.V. All rights reserved.