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By Chamberlain JS

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These hydrogen atoms are less electronegative than the core carbon atoms and donate a partial electron charge to the molecular core. This makes 24 3 Organic semiconductor materials for OFETs the backbone electron rich and shifts the energy levels so as to favor the loss of an electron over its gain (and, by extension, the formation of a hole channel over an electron channel). Put another way, the negatively charged form of the material is energetically unfavored. To make transistors that carry electrons easily the conjugated backbone needs to be electron deficient so that the LUMO level falls lower and gaining an electron becomes possible.

Afzali et al. has developed a family of soluble pentacene precursors [26]. These materials can be converted into well packed pentacene films on exposure to heat. The conversion process can also be engineered to be photopatternable. Tang et al. [27] has shown several pentacene and tetracene analogs that increase stability by incorporating thiophene groups at the ends. 2 Electron transporting materials 23 molecules. Since the shape is similar, these analogs retain many of the same favorable crystal-forming kinetics that pentacene and tetracene enjoy.

Several approaches have been pursued to rectify these problems. One strategy to overcome all three objections simultaneously is to synthetically attach bulky groups to the 6,13 positions of pentacene. When the groups are properly selected this passivates the most reactive sites of the molecule, constrains the crystallization into a single highly favorable phase, and imparts solubility [24]. While soluble, TIPS pentacene is also light enough to be purified and deposited using vacuum sublimation.

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A textbook of organic chemistry by Chamberlain JS


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