All-organic solution-processed two-terminal transistors fabricated using the photoinduced p-channels

Dae Sung Chung; Won Min Yun; Sooji Nam; Se Hyun Kim; Chan Eon Park; Jong Won Park; Soon-Ki Kwon; Yun-Hi Kim
January 2009
Applied Physics Letters;1/26/2009, Vol. 94 Issue 4, pN.PAG
Academic Journal
All-organic solution-processed two-terminal transistors were fabricated by replacing the “field-induced p-channel” of an organic field-effect transistor with a “photoinduced p-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 5×102. We explain this photogenerated p-channel effect using Helfrich’s theory, which describes the photodetrapping behavior of a space-charge-limited current under illumination.


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