Optical and structural properties of PVK/CA/PVK thin films fabricated by spin coating method

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• 作者：M. Zamani Babgohari^a ; S.M. Bagher Ghorashi^b ; ^{mghorashi@kashanu.ac.ir} ; Gh. Mirjalili^a
• 关键词：Polymeric thin film ; Spin coating ; Band gap ; PVK ; CA
• 刊名：Optik - International Journal for Light and Electron Optics
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：131
• 期：Complete
• 页码：862-868
• 全文大小：1542 K
• 卷排序：131

文摘

Polymeric thin films were fabricated by depositing three consecutive PVK/CA/PVK layers using spin coating method. Deposition parameters such as materials, rotation speed, rotation time and annealing conditions were determined and optimized to achieve homogenous and transparent layers. Fabricated thin films contain granular microstructures. X-Ray refraction pattern of PVK thin film showed that the annealed film was amorphous in 140 °C. Refractive index and extinction coefficient of PVK were determined by transmission spectrum. Transmission spectrum of samples showed that the layers absorb ultra-violet waves; and these layers are transparent against visible waves. Annealing the layers causes higher transparency. Optical band gap of layers was measured 3.5 eV which claims desirable consistency with recent data.