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IRG 3 Highlights

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.

Verticle Nanopore Bulk Heterojunction Solar Cells

A major effort in CPIMA has been to control and characterize interfacial charge transport in directed nanoassemblies. Such research is motivated by basic issues that relate to the performance of organic electronic devices, including photovoltaics, field-effect transistors, biological sensors, and memory elements. This highlight focuses on recent activity in photovoltaics. Prior work in CPIMA by McGehee in collaboration with Miller has demonstrated that poly(3-hexylthiophene) (P3HT) has much larger charge carrier mobility when confined in straight nanopores than when confined in disordered nanopores.

Patterning of Large Arrays of Organic Semiconductor Single Crystals

Field-effect transistors made of single organic crystals are ideal for studying the charge transport characteristics of organic semiconductor materials. Their outstanding device performance, relative to that of transistors made of organic thin films, makes them also attractive candidates for electronic applications such as active matrix displays and sensor arrays. The only approach currently available […]

The Key to Making High Mobility Polymer Thin Film Transistors: Nucleation of Crystals Off of the Gate Dielectric

Polymer Thin Films When conjugated polymer crystals nucleate off of the gate dielectric, the conjugated backbones, shown in red, are all aligned. Charge can easily hop from one grain to another.

Kline, R. J., McGehee, M. D., Fr├ęchet, J. M. J., et al. Macromolecules 38, 3312 (2005)
Kline, R. J., McGehee, M. D. & Toney, M. F., Nature Materials 5, 222 (2006).