MS25-P02 Combination of GIWAXS and TEM study in understanding polymer-fullerene fibrillar network structure Chin-Ti Chen (Institute of Chemistry + Academia Sinica, Taipei, Taiwan) Song-Fu Liao (Department of Materials Science and Engineering + National Taiwan University, Taipei, Taiwan) Chi-Yang Chao (Department of Materials Science and Engineering + National Taiwan University, Taipei, Taiwan)email: chintchen@gate.sinica.edu.twIn addition to the larger absorption coefficient and longer absorption wavelength, high short-circuit current density can be associated to the high portion of face-on, in-plane crystallite orientation of P4TIF, which is evident by GIWAXS study.  GIWAXS study reveals that the face-on (in plane) orientation is most pronounced, lamellar structure, (100), pi-pi stacking structure, (010), and crystallite correlation length are more significant or longer than those of P4TIN.  Moreover, thin film morphology probed by TEM reveals the fibril network nanostructure, which is more pronounced in PC61BM-blended P4TIF thin films than P4TIN ones.  The chemical structure difference between P4TIF and P4TIN is the fluorine (F) and nitrile (CN) substituent. Such difference in fibrillary morphology, which is in turn due to the different molecular interaction of F or CN,  promotes the photocurrent output and hence short-circuit current density of the polymer-based organic photovoltaics.References:

Keywords: GIWAXS, TEM, polymer-fullerene fibril