pps proceeding - Abstract Preview
pps proceeding
Symposium: S07 - Morphology and Structure Development
Oral Presentation
 
 

Tuning Local Molecular Orientation-Composition Correlations in Binary Organic Thin Films by Solution Shearing

Ma Wei (1)*

(1) Xi'an Jiaotong University - Shaan xi - China

Among the methods for solution processed thin film fabrication, the solution shearing have a great ability to manipulate the molecular packing and morphology of the active layer. In our study, a general impact of solution shearing on molecular orientation correlation is observed in polymer-fullerene blend in which one of the components forms fibrils or aggregates. The polarized soft X-ray scattering reveals that solution shearing induce more face-to-face orientation relative to the interface of two components compared to spin-coating, and a slow shearing speed can induce more face-to-face orientation than a fast shearing speed. Our work indicates that solution shearing coating is an effective method to control the molecular orientation and the ordering relative to an interface of a two components system. The results present a new and exciting possibility for controlling the morphology and aggregation in drying solutions under shear, which might be applied to improve the organic solar cells performance in systems that are difficult to control with spin-casting or other conventional methods1, 2. 1. W. Ma, J. Reinspach, Y. Zhou, Y. Diao, T. McAfee, S. Mannsfeld, Z. Bao, H. Ade, Adv. Funct. Mater. 2015, 25, 3131-3137. 2. Y. Diao, B. C. Tee, G. Giri, J. Xu, D. H. Kim, H. A. Becerril, R. M. Stoltenberg, T. H. Lee, G. Xue, S. C. B. Mannsfeld, Z. Bao, Nat. Mater. 2013, 12, 665.