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Issue 48, 2019
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Electric-field assisted nucleation processes of croconic acid films

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Growth of organic thin films using physical vapor deposition typically follows a three-dimensional mode, resulting in a rough surface, which undermines their application potential. To address this issue, we have studied the effect of electric field and temperature on the growth dynamics, especially the heterogeneous nucleation process, of croconic acid (CA) films, taking advantage of the large dipole moment of the molecules and the ferroelectric polarization of the molecular crystals. We found that the nucleation rate reaches the maximum at intermediate temperature, and the electric field shifts the maximum nucleation rate towards lower temperature. An analysis using the classical nucleation theory suggests that the electric field decreases the sublimation temperature, increases the wetting angle, and decreases the surface diffusion barrier. These results provide important insight into the growth of molecular crystal films under electric fields and pave the way to fabricating films with better surface characteristics for molecular ferroelectric films.

Graphical abstract: Electric-field assisted nucleation processes of croconic acid films

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The article was received on 22 Sep 2019, accepted on 29 Oct 2019 and first published on 30 Oct 2019

Article type: Paper
DOI: 10.1039/C9CE01493D
CrystEngComm, 2019,21, 7460-7467

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    Electric-field assisted nucleation processes of croconic acid films

    Y. Yuan, X. Jiang, S. Poddar and X. Xu, CrystEngComm, 2019, 21, 7460
    DOI: 10.1039/C9CE01493D

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