Vacuum sublimated thin films of metallophthalocyanines (where metal = Cu, Fe, Zn, and Mn) and metal-free phthalocyanine were prepared at different deposition temperatures. The optical properties have been studied in the wavelength range of 340 nm to 2500 nm for samples deposited at room temperature up to 250 °C. Atomic force microscopy was used to obtain images of the surface morphology. Absorption coefficient spectra obtained verify the π to π* transition in the region 526 nm to 735 nm for the Q band, throughout all samples studied. The independence of deposition temperature or grain size in peak positions in absorption coefficient throughout all samples has been shown. The ratio of intensity of the two absorption coefficient peaks in the Q band has been calculated, showing a change in MnPc intensity ratio with changing deposition temperature. The intensity of the highest peak in the Q band has been compared for different metallophthalocyanines and across different deposition temperatures. CuPc deposited at 250 °C has been shown to have the highest peak magnitude of absorption coefficient, with a value of 3.9×10 5 cm–1.
|Commitee:||Bill, Andreas, Gu, Jiyeong|
|School:||California State University, Long Beach|
|Department:||Physics and Astronomy|
|School Location:||United States -- California|
|Source:||MAI 58/02M(E), Masters Abstracts International|
|Subjects:||Organic chemistry, Condensed matter physics, Optics|
|Keywords:||Absorption coefficient, Organic photovoltaics, Organic semiconductors, Phthalocyanine, Surface morphology, Thin films|
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