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All-organic solution-processed two-terminal transistors fabricated using the photoinduced -channels
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All-organic solution-processed two-terminal transistors were fabricated by replacing the “field-induced -channel” of an organic field-effect transistor with a “photoinduced -channel.” A simple device structure—containing solution-processed 2,6-di(naphthalene-2-yl)-9,10-bis(triisopropylsilylethynyl)anthracene single crystals as the active layer (on a plastic substrate) and poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) as source and drain electrodes—enabled high-performance photosensor (and even transistor) behavior, showing pseudo-output and transfer curves with an on/off ratio of . We explain this photogenerated -channel effect using Helfrich’s theory, which describes the photodetrapping behavior of a space-charge-limited current under illumination.
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