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Effect of Temperature on Stacking Orientations of Zinc Phthalocyanine Thin Films

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Abstract:

This paper reports the structural and optical properties of zinc phthalocyanine (ZnPc) thin films, prepared by thermal evaporation method, and their stacking dependence on the substrate temperature. The thickness of the films was measured by a quartz crystal monitor. X-ray diffraction analysis of the vacuum evaporated ZnPc films identified a phase transformation of metastable α-ZnPc phase to stable -ZnPc phase due to variation in the substrate temperature. The crystallite size (D), dislocation density () and strain () were calculated. The transmittance and absorbance spectra were recorded in the wavelength range 300–2500 nm using a UV-vis spectrophotometer. As the temperature was increased from room temperature to 200 °C, the band gap energy was decreased from 1.82 eV to 1.67 eV. The phase transformation was also confirmed by optical studies.

Keywords: OPTICAL; STACKING ORIENTATION; THERMAL EVAPORATION; ZINC PHTHALOCYANINE (ZNPC)

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2008.1050

Publication date: October 1, 2008

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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