Patterning Organic Semiconductor Single Crystal Field-Effect Transistors
Single-crystal organic field-effect transistors (OFETs) are ideal device structures for studying fundamental science associated with charge transport in organic materials and have demonstrated outstanding electrical characteristics. However, it remains a technical challenge to integrate single-crystal devices into practical electronic applications. A key difficulty is that organic single-crystal devices are usually fabricated one device at a time through manual selection and placing individual crystals. To overcome this difficulty, Bao et al. successfully developed two high-throughput approaches to pattern organic single crystal arrays.
Vivian Trang joined CPIMA scientists at Stanford and IBM working to develop novel synthesis methods to control the porosity of hydrogels. She used an organocatalytic living polymerization method to make the systems. Cyclic carbonate functional macromolecules were ring-opened using an alcoholic initiator in the presence of an organic catalyst. A model reaction for the cross-linking identified the critical monomer concentration dependent reaction regimes, and enhanced kinetic control was demonstrated by introducing a co-monomer which facilitated near quantitative conversion of monomer to polymer (>96%).
