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In many experiments, exposure of p-channel organic FETs to alcohols produced an initial increase in channel current (presumably the effect of dipoles) followed by a decrease (due to trapping). The initial increase may be due to dipoles in the polar analyte, inducing more charge in the channel. 114 However, according to our experimental findings and analysis, scaling down the geometry of an OFET device is not a simple way, as expected, to enhance the sensitivity. 115 first systematically investigated the scaling behavior of chemical sensing in OFETs with channel lengths ranging from microns to tens of nanometers and found that the sensing mechanism of where and how analyte molecules affect the electrical transport in an organic transistor becomes quite different when devices scaled from micron-scale to nanoscale dimensions.

They are in logarithmic vs. square root scales for a series of channel lengths at four different temperatures. For each scattered curve measured at a certain channel length, its “bottom part” (at relatively lower longitudinal field, marked as hollow symbols) is subject to injectionlimited transport. The straight dash line in each panel is the envelope combining the high field parts (solid symbols) of all the scattered curves measured at different channel lengths to filter out the injection limitation at low fields.

A) SEM image of a 5 nm channel just before pentacene evaporation. (b) SEM image of a 9 nm channel after I–V measurement. The white scale bars are 100 nm. (Reprinted with permission from Ref. 40. 14 The DC characteristics of sub-10-nm pentacene FETs. (a) The DC I–V measurement of the device in Fig. 13b, with the side guards biased at the same potential as the drain. (b) The DC I–V measurement of a 19 nm channel device with the side guards biased; Ids /I increases with increasing |Vg|. (c) ln(Ids/Vds) vs.

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