Back to Search
Start Over
In situ monitoring the drying kinetics of knife coated polymer-fullerene films for organic solar cells.
- Source :
-
Journal of Applied Physics . Dec2009, Vol. 106 Issue 12, p124501-1-124501-7. 7p. 3 Diagrams, 2 Charts, 5 Graphs. - Publication Year :
- 2009
-
Abstract
- The efficiency of polymer based bulk heterojunction (BHJ) solar cells mainly depends on the film morphology of the absorption layer and the interface properties between the stacked layers. A comparative study using atomic force microscopy (AFM) and optical in situ thin film drying measurements is performed. The strong impact of distinct drying scenarios on the polymer:fullerene BHJ layer morphology is investigated by AFM. The AFM images show a systematic dependency of structure sizes at the surface on drying kinetics. In addition thin film optical measurements for the determination of thin film drying kinetics and parameters are performed using a dedicated experimental setup. The data are used as the input for a quantitative simulation of the drying process. The film thickness decreases linearly during drying while the solvent mass fraction decreases moderately over a wide range until it drops rapidly. Subsequently the remaining solvent fraction evaporates considerably slower. Our work gives a fundamental understanding of the film formation kinetics and prerequisites for the systematic optimization of the film morphology in solution processed organic photovoltaic devices. [ABSTRACT FROM AUTHOR]
- Subjects :
- *FULLERENE thin films
*POLYMERS
*DRYING
*SOLAR cells
*HETEROJUNCTIONS
Subjects
Details
- Language :
- English
- ISSN :
- 00218979
- Volume :
- 106
- Issue :
- 12
- Database :
- Academic Search Index
- Journal :
- Journal of Applied Physics
- Publication Type :
- Academic Journal
- Accession number :
- 47244311
- Full Text :
- https://doi.org/10.1063/1.3270402