September 2, 2017

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

By Institute of Electrical and Electronics Engineers

ISBN-10: 1424412447

ISBN-13: 9781424412440

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For smaller channel lengths, the number of grain boundaries within a channel decreases 29 30 Chapter One so that the weight of influence of grain boundaries on electrical transport and chemical sensing reduces and other factors become more important. At smaller channel dimensions, especially when the channel length is comparable to or smaller than the grain size of polycrystalline organic molecules or conjugated polymers, we might possibly observe the electrical transport and chemical sensing behaviors within the body of grains which may exhibit a mechanism different from that in large-scale devices where grain boundaries dominate.

For a polycrystalline thin-film layer of an organic semiconductor such as pentacene thermally sublimed in vacuum, most of the disorder is located at grain boundaries. Therefore for the 11 12 Chapter One OTFTs with channel lengths of 1 μm and longer, which are much larger than the average grain size (100 to 150 nm) of pentacene deposited under the conditions described above, the electrical transport data could be explained by the multiple trapping and release model28 with significant influence from the grain boundaries.

If the contacts are good, transport is not injection-limited (Fig. 14a and c). 82, 83 On the other hand, when channel lengths are less than the average grain size, transport through a single grain may become important; however, the injection properties of the contact (which is possibly affected by the local morphology of the pentacene grain) are the most important factor that influences the electrical response. The grain sizes of the pentacene layer were found to be from 40 up to 200 nm, much larger than the channel lengths of the measured devices (from 8 to 35 nm).

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