Today is the age of solar cells or solar panels. Development of an efficient and economical solar cell module is the dream of the photovoltaic community. During the last three decades considerable development has been achieved in the field of solar energy research, material development and fabrication of solar cells. Nowadays organic materials find greater importance in the photovoltaic cell fabrications. Among the available organic materials ZincPhthalocyanine (ZnPc) is a promising candidate for the solar cell applications. Because of its easy synthesis and non-toxic to the environment. Phthalocyanine (PCs) is promising candidates for the active part of organic solar cells. It is a self-assembling liquid crystal developed from a common deep blue-green pigment. It exhibits a characteristic structural self-organizing, which is reflected in an efficient energy migration in the form of extinction transport. In this paper we have reported Structural, Optical and Thermal properties of flash evaporated ZincPhthalocyanine (ZnPc) thin films. The samples were prepared by using vacuum coating unit on the well-cleaned glass substrates under a pressure of 7x10-6 Torr. A constant rate of evaporation(1Å/sec) was maintained throughout the evaporation of ZnPc thin film. Rotary drive was employed to obtain uniform thickness during the evaporation. Thicknesses of the films were monitored by the quartz-crystal thickness monitor and were verified by the Multiple Beam Interferometry (MBI). X-Ray Diffraction (XRD) and Scanning Electron Microscope (SEM) studies were carried out for the structural and surface analyses respectively. The structure of the films coated at the substrate temperature T=303K was found to be amorphous. The optical transmittance measurements were carried out by the spectrophotometer in the visible region (400nm-800nm) the films are found to be absorbing in nature. The absorption coefficient, extinction coefficient and refractive index of the ZnPc films were evaluated and the results are discussed. The optical transition were in these film was direct and allowed. The thermal gravimetric analysis (TGA) and Differential Scanning Calorimetry (DSC) studies on ZnPc films were carried out and their results are discussed in this paper.
Senthilarasu, S., Sathyamoorthy, R., Subbarayan, A., Sebastian, P., Matthew, X., & Velumani, S. (2002). Structural, optical and thermal properties of flash evaporated zinc phthalocyanine (ZnPc) thin films.