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. But BTFE allows crosslinking of the polymer chains through thermal- or photocuring, resulting in low density of charge traps. Cross-linking of P(VDF-BTFE) has little effect on its dielectric properties and is realized through adding crosslinkers (dicumyl peroxide and triallyl isocyanurate) to P(VDF-BTFE) and exposing the film to ultraviolet light for several hours. The cross-linking is controlled through shadow masks and the uncross-linked polymer is removed through solvent exposure. The role of cross-linking on P(VDFBTFE) was investigated by quantifying the populations of P(VDF-BTFE) chain conformations by means of Fourier transform infrared spectroscopy. The results showed that TTTG (T: trans, G: gauche) conformations mostly dominate. The researchers believe that enhancement of trans chain conformations and the lower heterogeneity in the dielectric layer demonstrates a reduction of chain twisting induced by misoriented dipoles, and thus less energetic disorder and minimal trap density. According to Facchetti the extension of this work to other organic semiconductors will open unprecedented opportunities for unconventional electronics. Oana Jurchescu, a professor at Wake Forest University, also considers the work of Gomez’s team as a significant achievement that paves the way for the high-performance operation of OFETs at low voltages. “These results are extremely promising as they show that organic semiconductors can yield efficient devices even at low voltages upon minimizing the trap densities in the device channel,” Jurchescu says. Gomez believes that the control of the semiconductor–dielectric interface has the potential to transform OFETs either “through changes to chemical structure of the polymer dielectric or through changes specific to the interface.” He says the group is planning to continue their work “to achieve performance that will make these devices relevant for flexible displays or bioelectronic applications.” Eva Karatairi

• VOLUME 42 • FEBRUARY 2017 • Michigan www.mrs.org/bulletin Downloaded MRS fromBULLETIN https:/www.cambridge.org/core. Eastern University Library, on 31 Mar 2017 at 08:58:42, subject to the Cambridge Core terms of use, available at https:/www.cambridge.org/core/terms. https://doi.org/10.1557/mrs.2017.12

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