Dynamic Monte Carlo simulation of organic molecular beam deposition: influence of growth parameters on film morphology

Ehrlich-Schwoebel effect for organic molecules: Direct calculation of the step-edge barrier using empirical potentials

“…The strength of the step edge barrier controls the amount of mass transport between different crystalline layers, and hence determines the temperature dependence of the kinetic growth mode (two-dimensional layer-by-layer or threedimensional mound growth) in situations where energetic driving forces shaping the surface morphology can be neglected. 4 There is considerable indirect evidence that points to the presence of a step edge barrier for prototypical organic semiconductor molecules like 3,4,9,10-perylenetetracaboxylic-dianhydride (PTCDA) 5,6,7,8,9 and pentacene, 10,11,12 and the ES effect has been invoked in several simulation studies of organic film growth 9,10,13 . Very recently a quantitative estimate for the step edge barrier on pentacene has been obtained from an analysis of experimental layer coverages 14 .…”