Thin-Film Organic Polymer Phototransistors

High-mobility pentacene phototransistor with nanostructured SiO2 gate dielectric synthesized by sol–gel method

“…The R value for the transistor was found to be 100 mA/W. This value is several orders of magnitude higher than that reported (0.7 mA/W) for thin film organic polymer phototransistors [40,41]. From all the above, it is obvious that the morphology of the pentacene thin film (as it was deposited on the present nanoSiO 2 dielectric surface) was improved in relation to other structures proposed in literature.…”

Photoactive self-assembled monolayers for optically switchable organic thin-film transistors

“…On the other hand, taking advantage of these features enables the realization of photosensitive transistors that can be used, e.g., for light detection and light induced switches. [6][7][8][9][10][11][12] Among the different approaches to fabricate organic thinfilm transistors, the use of self-assembled monolayers as part of a thin hybrid dielectric has proven to be a promising route to realize flexible, low-power consuming organic thin-film transistors and circuits with a promising stability. 13,14 Moreover, it has been shown that applying molecules with electron acceptor functionality in a self-assembled monolayer (SAM) on a thick SiO 2 dielectric leads to a large photosensitivity in combination with pentacene as the semiconductor.…”

Organic phototransistor based on poly(3-hexylthiophene)/TiO2 nanoparticle composite

“…4 Organic phototransistors ͑OPTs͒ are considered to be one of the feasible application of organic thin film transistor ͑OTFT͒ because of their large adsorption properties in ultraviolet ͑UV͒ and visible light and the excellent photocurrent generation efficiency of organic semiconductors. [5][6][7][8][9][10][11][12][13][14][15] More importantly, some OPTs can be fabricated by solution process, [13][14][15] such as printing or spin coating, at room temperature and therefore can be easily integrated in smart clothes, packages, and biological systems as light sensors, biosensors, and multifunctional sensors.…”

“…Solution processible OPTs based on conjugated polymers, such as poly͑9,9-dioctylfluorene-co-bithiophene͒, 12 poly͑3-octylthiophene-2,5-diyl͒, 13 and blends of poly͑2-methoxy-5-͑3,7-dimethyloctyloxy͒͒-1,4-phenylenevinylene͒ ͑MDMO-PPV͒ and methanof ͓6,6͔-phenyl C 61 -butyric acid methyl ester 14 ͑PCBM͒ have been reported. Light illumination can induce pronounced changes both in threshold voltage and off current of the devices, which can be attributed to trapping of electrons at the semiconductor/insulator interface and light induced photocurrent, respectively.…”