We have studied the kinetic roughening in the growth of cobalt phthalocyanine (CoPc) thin films grown on SiO2/Si(001) surfaces as a function of the deposition time and the growth temperature using atomic force microscopy (AFM). We have observed that the growth exhibits the formation of irregular islands, which grow laterally as well as vertically with coverage of CoPc molecules, resulting rough film formation. Our analysis further disclosed that such formation is due to an instability in the growth induced by local diffusion of the molecules following an anomalous scaling behavior. The instability relates the (In(t))(1/2), with t as deposition time, dependence of the local surface slope as described in nonequilibrium film growth. The roughening has been characterized by calculating different scaling exponents alpha, beta, and 1/z determined from the height fluctuations obtained from AFM images. We obtained an average roughness exponent alpha = 0.78 +/- 0.04. The interface width (W) increases following a power law as W similar to t(beta), with growth exponent beta = 0.37 +/- 0.05 and lateral correlation length (xi) grows as xi similar to t(1/z) with dynamic exponent 1/z = 0.23 +/- 0.06. The exponents revealed that the growth belongs to a different class of universality.
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Korea Adv Inst Sci & Technol, Dept Phys, Daejeon 34141, South Korea
Korea Adv Inst Sci & Technol, Ctr Lattice Defectron, Daejeon 34141, South KoreaKorea Adv Inst Sci & Technol, Dept Phys, Daejeon 34141, South Korea
Kim, Kwang-Eun
Yang, Chan-Ho
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Korea Adv Inst Sci & Technol, Dept Phys, Daejeon 34141, South Korea
Korea Adv Inst Sci & Technol, Ctr Lattice Defectron, Daejeon 34141, South Korea
Korea Adv Inst Sci & Technol, Inst NanoCentury, Daejeon 34141, South KoreaKorea Adv Inst Sci & Technol, Dept Phys, Daejeon 34141, South Korea
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Department of Chemistry, University of WarwickHunan Key Laboratory for Super-microstructure and Ultrafast Process, School of Physics and Electronics,Central South University
Tim S Jones
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Hunan Key Laboratory for Super-microstructure and Ultrafast Process, School of Physics and Electronics,Central South UniversityHunan Key Laboratory for Super-microstructure and Ultrafast Process, School of Physics and Electronics,Central South University
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阳军亮
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Hunan Key Laboratory for Super-microstructure and Ultrafast Process, School of Physics and Electronics,Central South UniversityHunan Key Laboratory for Super-microstructure and Ultrafast Process, School of Physics and Electronics,Central South University