Issue 48, 2019

Electric-field assisted nucleation processes of croconic acid films

Abstract

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

Supplementary files

Article information

Article type
Paper
Submitted
22 Sep 2019
Accepted
29 Oct 2019
First published
30 Oct 2019

CrystEngComm, 2019,21, 7460-7467

Author version available

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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