From Greenville, SC
The realization of electron transporting materials suitable for use in organic electronics has been one of the key challenges in the development of efficient organic field-effect transistors(OFET), organic light-emitting diodes(OLED), and organic photovoltaics(OPV). We have recently synthesized a new class of core-cyanated rylene imide dyes with unconventionally large electron affinity, resulting in facile formation and incredible stability of the negatively charged species. OFET’s fabricated from polycrystalline vapor deposited thin films of these materials reveal electron mobilities ~ 0.5 cm 2V -1s -1, V TH ~ 0 V, and I ON/I OFF ~ 10 5 measured in ambient atmosphere with minimal degradation over the course of more than one year and hundreds of operating cycles. Chemical substitution at the imide position is found to have minimal impact on the ambient device stability with both fluorinated and entirely hydrocarbon materials operating in air; however, electrical and morphological characteristics vary widely as a function of interfacial conditions between the film and substrate. Utilizing the desirable electrical characteristics and ambient stability of these materials, we have pursued fabricating other device structures with multiple electrode configurations, complementary circuits, and photovoltaic functions.
For Further Information: Jones, et. al. Angew. Chem. Int. Ed. 2004, 43, 6363-6366.