Direct, Mask- and Solvent-Free Printing of Molecular Organic Semiconductors

✍ Scribed by M. Shtein; P. Peumans; J. B. Benziger; S. R. Forrest

• Publisher: John Wiley and Sons
• Year: 2004
• Tongue: English
• Weight: 286 KB
• Volume: 16
• Category: Article
• ISSN: 0935-9648
• DOI: 10.1002/adma.200400260

✦ Synopsis

for symmetric polymer blends. The intrinsic interfacial width is given by

where a is the segment length, v is the interaction parameter, n(vN) is the finite molecular-weight correction [27]. For our asymmetric BCB± TFB system, we took (again without rigorous justification) w to be the geometric mean

where w 1 is for a hypothetical symmetric mixture with the molecular weight of (the very short chain) BCB and w 8 of (the high polymer) TFB. In this way we obtained w = 10 , which when divided by Ö2pgave a theoretical r = 4 , which appears to be in line with experiment. From such back-of-the-envelope calculations, we obtained an intuitive insight that narrow interfacial widths (i.e., molecularly abrupt junctions) can be possible in strongly segregated systems.