Anomalous scaling behavior and surface roughening in molecular thin-film deposition

Yim, Sanggyu; Jones, T.S.

doi:10.1103/physrevb.73.161305

Cited by 70 publications

(59 citation statements)

References 27 publications

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“…15 However,  values above 0.5 have been reported by some authors. [26][27][28][29] Recent studies suggest that this must be due to some nonlocal effects in surface dynamics, 30 e.g., step-edge barrier, shadowing effect, (002) orientation.…”

Section: Xps and Quases Analysis Of The Growth Of Silvermentioning

confidence: 99%

Growth of silver on ZnO and SnO2 thin films intended for low emissivity applications

Álvarez

González

Espinós

et al. 2013

Applied Surface Science

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In the present work we have investigated the relationships existing between the optical properties and the growth mechanism, microstructure and surface roughness of SnO 2 and ZnO oxide films prepared by magnetron sputtering under conditions resembling those utilized in industry. Thin films of these oxides with different thicknesses were characterized by atomic force microscopy, glancing incidence X-ray diffraction (GIXRD), X-ray reflectometry and spectroscopic Ellipsometry. The roughness evolution of the film properties (density, surface roughness and refraction index) as a function of their thickness has been evaluated within the concepts of the Dynamic Scaling Theory of thin film growth. Zinc oxide films were rougher than tin oxide films of similar *Manuscript Click here to view linked References 2 thickness, indicating a different growing mechanism for the two materials. Silver was evaporated onto the surface of the two oxide thin films and its earlier stages of nucleation studied by background analysis of the X-ray photoemission spectra. A different nucleation mechanism was found depending on the nature of the oxide acting as substrate. The superior performance of the zinc oxide based low emissive coatings is related with a better wetting of silver on the surface of this oxide despite the comparatively lower roughness of the tin oxide layers.

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Section: Xps and Quases Analysis Of The Growth Of Silvermentioning

confidence: 99%

Growth of silver on ZnO and SnO2 thin films intended for low emissivity applications

Álvarez

González

Espinós

et al. 2013

Applied Surface Science

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“…Consequently, the small number of studies on the growth behavior of molecular films reports very different characteristics from those commonly observed for inorganic and metallic thin films. [3][4][5][6][7] One of the most important differences is the large value of the growth exponent ͑␤͒ obtained through application of scaling analysis. For example, recent studies of free-base phthalocyanine ͑H 2 Pc͒, 3 di-indenoperylene, 5 and perylene-3,4,9,10-tetracarboxylic dianhydride ͑PTCDA͒ 7 report ␤ values of 1.02, 0.75, and 0.54, respectively.…”

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confidence: 99%

“…12,13 In this context, systems with ␤ Ͼ ␤ RD = 0.5 imply an unusually rapid roughening. It has been suggested that this rapid roughening in molecular thin-film growth can be explained by spatial inhomogeneities due to the presence of different tilt domains and grain boundaries, [3][4][5] a consequence of the structural anisotropy of the molecular materials studied.…”

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confidence: 99%

Growth dynamics of C60 thin films: Effect of molecular structure

Yim

Jones

2009

Applied Physics Letters

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The surface morphology and growth behavior of fullerene thin films have been studied by atomic force microscopy and height difference correlation function analysis. In contrast to the large growth exponents (β) previously reported for other organic semiconductor thin-film materials, a relatively small β value of 0.39±0.10 was determined. Simulations of (1+1)-dimensional surface lateral diffusion models indicate that the evolution of deep grain boundaries leads to a rapid increase in β. We suggest that the commonly observed large β values for organic thin films are due to their intrinsically anisotropic molecular structures and hence different stacking directions between crystallite domains.

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“…And that metal phthalocyanine (MPc), because of the inherent anisotropy and specific shapes, often display complex growth behaviors and mechanisms. 8 As a result, great efforts have been devoted and significant progress has been achieved in the alignment/ patterning of organic nanostructures. Anodic aluminum oxide (AAO), 9 Au nanoparticles 6,10 and grating templated methods 11 have been demonstrated to be effective for the aligned growth of organic a) Electronic mail: hai.wang.ucl@gmail.com b) Electronic mail: scitang@163.com nanowire arrays.…”

Section: Introductionmentioning

confidence: 99%

Controllable preparation of copper phthalocyanine single crystal nano column and its chlorine gas sensing properties

et al. 2016

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The unsubstituted copper phthalocyanine (CuPc) single crystal nano columns were fabricated for the first time as chlorine (Cl2) gas sensors in this paper. The nano columns of CuPc have been prepared on different substrates via template-free physical vapor deposition (PVD) approach. The growth mechanism of CuPc nano column on quartz was explored and the same condition used on other substrates including glass, sapphire (C-plane<0001>, M-plane<101¯0>, R-plane<11¯02>), Si and SiO2/Si came to a same conclusion, which confirmed that the aligned growth of CuPc nano column is not substrate-dependent. And then the CuPc nano column with special morphology was integrated as in-situ sensor device which exhibits high sensitivity and selectivity towards Cl2 at room temperature with a minimum detection limit as low as 0.08 ppm. The response of sensor was found to increase linearly (26∼659%) with the increase for Cl2 within concentration range (0.08∼4.0ppm). These results clearly demonstrate the great potential of the nano column growth and device integration approach for sensor device.

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Anomalous scaling behavior and surface roughening in molecular thin-film deposition

Cited by 70 publications

References 27 publications

Growth of silver on ZnO and SnO2 thin films intended for low emissivity applications

Growth of silver on ZnO and SnO2 thin films intended for low emissivity applications

Growth dynamics of C60 thin films: Effect of molecular structure

Controllable preparation of copper phthalocyanine single crystal nano column and its chlorine gas sensing properties

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