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Morphology Development in Solution-Processed Functional Organic Blend Films: An In Situ Viewpoint.
Lee J Richter1, Dean M DeLongchamp1, Aram Amassian2
1Material Science and Engineering Division, National Institute of Standards and Technology , Gaithersburg, Maryland 20899, United States.
Chemical Reviews
|April 18, 2017
Summary
Solution-processed organic films enable advanced technologies. In situ measurements reveal how film drying impacts structure and performance, crucial for optimizing organic electronic devices.
Area of Science:
- Materials Science
- Organic Electronics
- Thin Film Deposition
Background:
- Solution-processed organic films offer a cost-effective method for fabricating large-area electronic components.
- The performance of these films is highly sensitive to their structure, which is influenced by the nonequilibrium drying process.
- Understanding the correlation between processing conditions and film structure is vital for device optimization.
Purpose of the Study:
- To review recent advancements in in situ measurements for understanding solution-based organic film deposition.
- To highlight insights into the fundamental processes governing film drying and structure evolution.
- To emphasize the importance of multimodal characterization techniques for comprehensive analysis.
Main Methods:
- Utilizing state-of-the-art in situ measurements during the drying of functional organic films.
- Employing multimodal studies that combine surface-sensitive X-ray scattering techniques, such as grazing-incidence wide-angle X-ray scattering (GIWAXS) and grazing-incidence small-angle X-ray scattering (GISAXS).
- Integrating optical characterization methods with X-ray scattering to correlate solute structure evolution with film thickness.
Main Results:
- Demonstrated the evolution of solute structure, including aggregation, crystallinity, and morphology, during film drying.
- Provided clear correlations between processing parameters and the resulting film structure.
- Showcased how multimodal studies offer a deeper understanding of the drying dynamics and their impact on film properties.
Conclusions:
- In situ measurements provide critical insights into the fundamentals of solution-based film deposition.
- Multimodal characterization is essential for elucidating the complex structure evolution during organic film drying.
- Optimizing the drying process through a fundamental understanding is key to enhancing the performance of organic electronic devices.