Natalie Stingelin1

1, Georgia Institute of Technology, Atlanta, Georgia, United States

Blends and other multicomponent systems are used in various polymer applications to meet multiple requirements that cannot be fulfilled by a single material. In polymer optoelectronic devices it is often desirable to combine the semiconducting properties of the conjugated species with the properties of certain commodity polymers, such as mechanical robustness, pronounce hydrophobicity and low gas diffusion. Here we investigate bicomponent blends comprising high-mobility, polymeric semiconductors, such as diketopyrrolopyrrol derivatives (DPP-T-TT) and selected semicrystalline commodity polymers, and show that, owing to a highly favourable, crystallization-induced phase segregation of the two components, we can reach low-percolating network systems similar to poly(3-hexylthiophene):high-density polyethylene (HDPE) blends. Focus of the presentation will be on the effect of the insulator on the sub-threshold voltage, bias stress and On-Off ratio as well as long-term environmental device stability of such DPP-T-TT devices; examples in the field of organic photovoltaics and the growing bioelectronics area are also given.