Scanning probe microscopy (SPM) of epitaxial oxide thin films

Guo, Hangwen; Zhang, J.

doi:10.1016/b978-1-78242-245-7.00011-7

Cited by 1 publication

(1 citation statement)

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“…For the epitaxial layer in the presence of a lattice mismatch between the growth layer and the substrate, a lattice mismatch ratio is commonly defined as the relative difference between the in-plane lattice constants of the growth layer and substrate. − The small lattice mismatch ratio means that the lattice points of the growth layer and the substrate are in good agreement. Some studies have estimated the lattice mismatch ratio of crystalline devices having electric and optical properties using various microscopic observation techniques in the vapor epitaxial growth process. − …”

Section: Introductionmentioning

confidence: 99%

Effect of Substrate Surfaces for Crystal Growth of a Photochromic Diarylethene by Sublimation

Isobe¹,

Kitagawa²,

Kobatake³

2022

Crystal Growth & Design

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The state of the substrate surface is one of the key factors in varying morphologies of crystals produced by the sublimation method of some organic compounds. In this work, we succeeded in separately preparing different morphologies of rodlike crystals of 1,2-bis(2,5-dimethyl-3-thienyl)perfluorocyclopentene (1a), which are classified into the hollow crystal and the feather-like crystal, by sublimation to glass substrates with the hydrophilic and hydrophobic surfaces, respectively. To clarify the crystal growth process on each surface of the glass substrate, we investigated miller indices of crystal faces attached to the substrate surface in the early stage of sublimation and crystal growth directions of these rodlike crystals from these crystal faces by X-ray diffraction measurements and polarizing microscopic observation. As a result, it was revealed that the heterojunction between the crystal faces produced in the early and following stages of sublimation leads to two different crystal morphologies. Moreover, it was confirmed that the heterojunctions occur in a specific orientation between these crystal faces because the lattice points in these crystal faces are in good agreement. Finally, we have demonstrated photomechanical behaviors of the hollow and feather-like crystals.

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