New PDF release: 2007 2nd International Workshop on Advances in Sensors and

By Institute of Electrical and Electronics Engineers

ISBN-10: 1424412447

ISBN-13: 9781424412440

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Slower growth rates Scaling Effects in Organic Transistors and Transistor-Based Chemical Sensors and higher substrate temperatures during sublimation tend to produce an organic layer with large grain size and planar morphology. The substrate temperature has a stronger influence than the sublimation rate. However, attempts to deposit large pentacene grains onto nanoscale channels at elevated substrate temperatures did not yield favorable results. This could be attributed to the repulsion of the Au electrodes from the pentacene molecules at elevated substrate temperatures.

Iopen behaved more as a long-channel FET, which indicates a substantial component of spreading current. For each of the measured devices, the maximum value of Ids was significantly lower than that of Iopen under the same voltage configuration, and the ratio Ids/Iopen was below 70%. This ratio was found to positively correlate to the W/L ratio. The distance from a channel to its side guards and the geometry of the electrodes may actually affect its Ids/Iopen ratio. 2 K. 41–45 To investigate the possible transport mechanisms which become dominant when scaling the device size from micron-scale down to nanoscale, we systematically fabricated thin-film field-effect transistors of a series of channel lengths from 5 μm down to 80 nm, with pentacene as the active organic semiconductor layer.

In addition, contact barrier at the interface between electrode and semiconductor will play an important role in scaling since the resistance through the semiconductor channel becomes smaller. 116 Thus the behavior of nanoscale OFET sensors is markedly different from that of larger-channel-length devices. In their study on the scaling behavior of chemical sensing in organic transistors,115 Liang Wang et al. employed pentacene as the active channel responsible for both charge transport and chemical sensing, and 1-pentanol was employed as the analyte, because pentacene is a typical organic semiconductor due to its relatively high mobility and wide use in organic electronics and sensors and 1-pentanol is a prototypical alcohol analyte to represent the sensing behaviors of the alcohol group.

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2007 2nd International Workshop on Advances in Sensors and Interface by Institute of Electrical and Electronics Engineers


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