Organic Molecular Beam Deposition

Schreiber, Frank

doi:10.1002/9783527654949.ch1

Cited by 1 publication

(2 citation statements)

References 141 publications

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“…All of the RMS curves show the typical oscillations related to layer-by-layer 2D growth for the initial layers ( n = 1–2), then 3D growth manifests itself with roughening steadily increasing after a critical coverage θ C of 2–3 ML, depending on temperature. This is consistent with the results reported in the literature. ,,, Thus, for θ < θ C , the filling of the second layer starts to grow only when the first layer is completed, and the same consideration applies to the third layer with respect to the second. At θ = θ C , the so-called “surface roughening” takes place: the upper layers start to form before the underneath one has been completed, and the films get rougher.…”

Section: Resultssupporting

confidence: 92%

“…This is consistent with the results reported in the literature. 16,17,71,72 Thus, for θ < θ C , the filling of the second layer starts to grow only when the first layer is completed, and the same consideration applies to the third layer with respect to the second. At θ = θ C , the so-called "surface roughening" takes place: the upper layers start to form before the underneath one has been completed, and the films get rougher.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Morphological Transitions in Organic Ultrathin Film Growth Imaged by In Situ Step-by-Step Atomic Force Microscopy

et al. 2020

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In situ atomic force microscopy (AFM) allowed us to investigate the evolution at the early stages of the growth of organic thin films. An ultrahigh-vacuum atomic force microscope, integrated with a Knudsen effusion cell for the sublimation of α-sexithiophene (6T), continuously scans the same region during the deposition of sublimed molecules on native silicon oxide as a function of the substrate temperature. Noncontact AFM images acquired sequentially provide snapshots of the time evolution of the film morphology that is monitored up to the deposition of five monolayers. At all substrate temperatures, a Stranski−Krastanov growth mode of organic films is observed: the first two monolayers grow layer-by-layer (two-dimensional2D), then films evolve into islands (three-dimensional3D). Despite the apparent similarity, we find an anomalous dynamic scaling characterized by the abrupt change of the growth exponent β vs substrate temperature. This novel transition, induced by the substrate temperature, is ascribed to the morphological transition from ziggurat islands to large terraces. The analysis of the evolution of the root-mean-square (RMS) roughness based on the distributed growth model underlines the role of down-hill mass transport for the growth of the first two monolayers, transport that is progressively hindered for the next monolayers.

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