This title appears in the Scientific Report :
2020
Please use the identifier:
http://dx.doi.org/10.1039/D0CP00214C in citations.
Please use the identifier: http://hdl.handle.net/2128/26052 in citations.
A phase-field model for the evaporation of thin film mixtures
A phase-field model for the evaporation of thin film mixtures
The performance of solution-processed solar cells strongly depends on the geometrical structure and roughness of the photovoltaic layers formed during film drying. During the drying process, the interplay of crystallization and liquid-liquid demixing leads to structure formation on the nano- and mic...
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Personal Name(s): | Ronsin, Olivier J. J. (Corresponding author) |
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Jang, DongJu / Egelhaaf, Hans-Joachim / Brabec, Christoph J. / Harting, Jens | |
Contributing Institute: |
Helmholtz-Institut Erlangen-Nürnberg Erneuerbare Energien; IEK-11 |
Published in: | Physical chemistry, chemical physics, 22 (2020) 12, S. 6638 - 6652 |
Imprint: |
Cambridge
RSC Publ.
2020
|
DOI: |
10.1039/D0CP00214C |
PubMed ID: |
32159553 |
Document Type: |
Journal Article |
Research Program: |
Solar cells of the next generation |
Subject (ZB): | |
Link: |
Get full text Published on 2020-03-05. Available in OpenAccess from 2021-03-05. Get full text Published on 2020-03-05. Available in OpenAccess from 2021-03-05. |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/26052 in citations.
The performance of solution-processed solar cells strongly depends on the geometrical structure and roughness of the photovoltaic layers formed during film drying. During the drying process, the interplay of crystallization and liquid-liquid demixing leads to structure formation on the nano- and microscale and to the final rough film. In order to better understand how the film structure can be improved by process engineering, we aim at theoretically investigating these systems by means of phase-field simulations. We introduce an evaporation model based on the Cahn-Hilliard equation for the evolution of the fluid concentrations coupled to the Allen-Cahn equation for the liquid-vapour phase transformation. We demonstrate its ability to match the experimentally measured drying kinetics and study the impact of the parameters of our model. Furthermore, the evaporation of solvent blends and solvent-vapour annealing are investigated. The dry film roughness emerges naturally from our set of equations, as illustrated through preliminary simulations of spinodal decomposition and film drying on structured substrates. |