Kinetic roughening study of perylene on glass and Au substrates

Zorba, Serkan; Yan, Li; Watkins, Neil J.; Gao, Yongli
December 2002
Applied Physics Letters;12/30/2002, Vol. 81 Issue 27, p5195
Academic Journal
We have investigated the growth kinetics of perylene, an organic semiconductor with high carrier mobility, on glass and Au substrates grown side-by-side by vapor deposition using atomic force microscopy. Our results show that kinetic roughening theory can reveal a wealth of information about polycrystalline growth. Higher order height-height correlation functions have been calculated for the perylene thin films on glass and Au. These results show that the height-height correlation function and the Hurst exponent saturate once the nominal perylene film thickness reaches the critical value of 40 Ã… on glass, and 100 Ã… on Au. After these thicknesses, overhang structures develop and dynamic scaling analysis becomes inappropriate. In addition, we have observed a complex, multiaffine behavior on both substrates evidenced by order dependence of the Hurst exponent. Grain size distribution and shape analysis were also performed on our films.


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