Spin coated versus dip coated electrochromic tungsten oxide films: Structure, morphology, optical and electrochemical properties
Spin coated versus dip coated electrochromic tungsten oxide films: Structure, morphology, optical and electrochemical properties
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DOI：
10.1016/j.electacta.2005.06.027
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发表时间：
2006-02-01
影响因子：
6.6
通讯作者：
Agnihotry, SA
中科院分区：
文献类型：
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作者：
Deepa, M;Saxena, TK;Agnihotry, SA
采用溶胶-凝胶衍生的乙酰化过氧钨酸溶胶（含4 wt.%的草酸二水合物（OAD）），采用自旋涂覆和浸渍涂覆技术沉积氧化钨（WO3）薄膜，用于智能窗口应用。利用傅里叶变换红外光谱（FT-IR）、扫描电子显微镜（SEM）和x射线衍射仪（XRD）研究和比较了自旋和浸镀薄膜的形貌和结构随退火温度（250℃和500℃）的变化规律。浸渍涂膜（250℃退火）的一个显著特征是其电致变色和电化学性能随着循环而改善而不退化，而旋转涂膜在重复循环下这些性能会恶化。通过对自旋和浸镀纳米结构薄膜（250℃退火）的比较研究发现，循环浸镀纳米结构薄膜在太阳能和光电区具有更高的传输调制和显色效率，更快的开关速度，更高的电化学活性和电荷存储容量等方面具有优越的性能。浸渍涂膜可以承受2500次漂白，而旋转涂膜只能承受1000次漂白。浸涂膜的循环稳定性较好，这是最佳含水量，孔隙率和晶粒尺寸之间的平衡的反映，暗示其潜在的电致变色窗口应用。(c) 2005 Elsevier Ltd版权所有。
A sol-gel derived acetylated peroxotungstic acid sol encompassing 4 wt.% of oxalic acid dihydrate (OAD) has been employed for the deposition of tungsten oxide (WO3) films by spin coating and dip coating techniques, in view of smart window applications. The morphological and structural evolution of the as-deposited spin and dip coated films as a function of annealing temperature (250 and 500 degrees C) has been examined and compared by Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM) and X-ray diffraction (XRD). A conspicuous feature of the dip coated film (annealed at 250 degrees C) is that its electrochromic and electrochemical properties ameliorate with cycling without degradation in contrast to the spin coated film for which these properties deteriorate under repetitive cycling. A comparative study of spin and dip coated nanostructured thin films (annealed at 250 degrees C) revealed a superior performance for the cycled dip coated film in terms of higher transmission modulation and coloration efficiency in solar and photopic regions, faster switching speed, higher electrochemical activity as well as charge storage capacity. While the dip coated film could endure 2500 color-bleach cycles, the spin coated film could sustain only a 1000 cycles. The better cycling stability of the dip coated film which is a repercussion of a balance between optimal water content, porosity and grain size hints at its potential for electrochromic window applications. (c) 2005 Elsevier Ltd. All rights reserved.