A metallic organic charge-transfer salt, (tetrathiafulvalene)(tetracyanoquinodimethane) [(TTF)(TCNQ)], is used as a source and drain contact material in n-channel organic transistors based on hexadecafluorophthalocyaninato copper (F16CuPc), and low contact resistance and good performance comparable to the Au-contact devices are observed. Ambipolar transistors are fabricated on the basis of a heterostructure of F16CuPc and copper phthalocyanine (CuPc).
We successfully fabricated the top-gate OFETs utilizing an aligned CuPc thin film. We achieved enhanced performance with aligned CuPc thin film compared with non-aligned one. The mobility reached to 0.07 cm 2 /Vs along the preferable axis, which was 10 times faster than that of the non-aligned one. The mobility perpendicular to the preferable axis was also enhanced.
The emission characteristics of single crystal LaB6 tips with 〈100〉, 〈110〉, and 〈210〉 orientations as a cathode for electron beam lithography systems have been evaluated. The tip with 〈100〉 orientation shows stable emission behavior after about 400 h of operation at 1430 °C, 5×10−7 Torr, because the faceting planes are formed and the shape of the tip stabilizes. The tips with 〈110〉 and 〈210〉 orientations also show better stability after early stage operation than do those with 〈100〉 orientation, as faceting planes have already appeared on the tips after 200 h of operation. As one of the applications, a 〈100〉 LaB6 cathode has been operated over 4000 h with high stability in a manufacturing electron beam lithography system (EeBES40).
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