Structural and optical properties of BaTi2O5 thin films prepared by pulsed laser deposition at different substrate temperatures
Structural and optical properties of BaTi2O5 thin films prepared by pulsed laser deposition at different substrate temperatures
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DOI：
10.1016/j.matchemphys.2008.07.048
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发表时间：
2009-01
影响因子：
4.6
通讯作者：
C. B. Wang;R. Tu;T. Goto;Q. Shen;Lianmeng Zhang
中科院分区：
文献类型：
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作者：
C. B. Wang;R. Tu;T. Goto;Q. Shen;Lianmeng Zhang
采用脉冲激光沉积法在MgO（100）衬底上制备了BaTi 2 O 5薄膜。研究了衬底温度（Tsub）对薄膜的晶相、择优取向、结晶度、表面形貌、光学透过率和带隙能等结构和光学性能的影响。薄膜的择优取向随Tsub的变化由（710）向（020）转变，在Tsub=973- 1023 K时可获得b轴取向的BaTi 2 O 5薄膜。薄膜的表面形貌随Tsub的变化而变化，在Tsub=973- 1023 K范围内，薄膜表面为致密的长条状颗粒织构。在升高的衬底温度下的结晶度和表面粗糙度增加。所制备的BaTi 2 O 5薄膜具有很高的透光率，其透光率可达70%左右。随着衬底温度的升高，禁带宽度逐渐减小，从Tsub= 923 K时的3.76eV减小到Tsub= 1023 K时的3.56eV。
BaTi2O5thin films were prepared on MgO (100) substrates by pulsed laser deposition. The effect of substrate temperature (Tsub) on the structural and optical properties of the films, such as crystal phase, preferred orientation, crystallinity, surface morphology, optical transmittance and bandgap energy, was investigated. The preferred orientation of the films changed form (710) to (020) depending on Tsub, and the b-axis oriented BaTi2O5thin film could be obtained at Tsub=973–1023K. The surface morphology of the films was different with changing Tsub, which showed a dense surface with an elongated granular texture at Tsub=973–1023K. The crystallinity and surface roughness increased at the elevated substrate temperatures. The as-deposited BaTi2O5thin films were highly transparent with an optical transmittance of ∼70%. The bandgap energy was found to decrease with increasing substrate temperature, from 3.76eV for Tsub=923K to 3.56eV for Tsub=1023K.