Morphologies and Nonlinear Optical Properties of VOPc Thin Films Prepared on KCl Substrate under Different Substrate Temperatures

Vanadyl-Phthalocyanine (VOPc) thin films were fabricated on KC1 (100) substrate by molecular beam epitaxy. The morphologies of VOPc thin films fabricated under different preparation conditions were investigated using Vis/UV spectra, SEM images and the third order nonlinear optical properties were measured with Maker fringe. The morphologies of VOPc thin films prepared with a substrate temperature maintained at 150°C transit from epitaxy to being a pseudomorphic layer with the increase in thickness. However, maintained at 200°C, they change from epitaxy to a deformed layer with the increase in thickness. Compared with the third-order nonlinear optical characteristics of different morphologies in this study, VOPc thin film formed with a pseudomorphic layer is superior.