Light responsive polymer field-effect transistor

Abstract

We report the effect of light incident on a polymer-based field-effect transistor and demonstrate the utility of light as an additional controlling parameter of the transistor state. The transistor exhibits large photosensitivity indicated by the sizable changes in the drain–source current at low levels of light. The response here is considerably higher than that from existing organic/polymeric planar, two-terminal photodetectors due to an additional process contributing to the enhancement. The light-responsive polymer transistor opens up a device-architecture concept for polymer-based electronics.

Highly photosensitive thin film transistors based on a composite of poly(3-hexylthiophene) and titania nanoparticles

“…OPTs that have been reported before normally show a response time of more than 10 s since the trapping process of electrons at the semiconductor/insulator interface is relatively slow. 13,20,22 It is worth noting that the OPTs reported in this paper show a much faster response to light illumination due to a different sensing mechanism, which will be explained later. As shown in Fig.…”

“…In addition, solution processible OPTs based on conjugated polymers, such as poly͑9,9-dioctylfluorene-co-bithiophene͒ ͑F8T2͒ ͑Ref. 21͒ and poly͑3-octylthiophene-2,5-diyl͒ ͑P3OT͒, 22 have been reported with the same working mechanism. However, trap states at the insulator/semiconductor interface may induce an obvious bias stressing effect.…”

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

“…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.…”

“…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.…”

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.…”