Ambipolar organic phototransistor

Saragi, Tobat P. I.; Onken, Kristian; Suske, Irina; Fuhrmann‐Lieker, Thomas; Salbeck, Josef

doi:10.1016/j.optmat.2006.07.001

Cited by 32 publications

(19 citation statements)

References 17 publications

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“…The present p-stackable D-A dyad represents a prototypical approach to combining p-and n-type transport channels in a single highlyordered solution processable layer. These results are complementary to other recent work which shows ambipolar characteristics in amorphous D-A dyad films, [78] and D-A pairs held together by hydrogen-bonds. [79] …”

Section: Electrical Propertiessupporting

confidence: 77%

Self‐Assembly of a Donor‐Acceptor Dyad Across Multiple Length Scales: Functional Architectures for Organic Electronics

Mativetsky

Kastler

Savage

et al. 2009

Adv Funct Materials

143

125

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Molecular dyads based on polycyclic electron donor (D) and electron acceptor (A) units represent suitable building blocks for forming highly ordered, solution‐processable, nanosegregated D‐A domains for potential use in (opto)electronic applications. A new dyad, based on alkyl substituted hexa‐peri‐hexabenzocoronene (HBC) and perylene monoimide (PMI) separated by an ethinylene linker, is shown to have a high tendency to self‐assemble into ordered supramolecular arrangements at multiple length scales: macroscopic extruded filaments display long‐range crystalline order, nanofiber networks are produced by simple spin‐coating, and monolayers with a lamellar packing are formed by physisorption at the solution‐HOPG interface. Moreover, highly uniform mesoscopic ribbons bearing atomically flat facets and steps with single‐molecule heights self‐assemble upon solvent‐vapor annealing. Electrical measurements of HBC‐PMI films and mesoscopic ribbons in a transistor configuration exhibit ambipolar transport with well balanced p‐ and n‐type mobilities. Owing to the increased level of order at the supramolecular level, devices based on ribbons show mobility increases of more than one order of magnitude.

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Section: Electrical Propertiessupporting

confidence: 77%

Self‐Assembly of a Donor‐Acceptor Dyad Across Multiple Length Scales: Functional Architectures for Organic Electronics

Mativetsky

Kastler

Savage

et al. 2009

Adv Funct Materials

143

125

View full text Add to dashboard Cite

show abstract

“…One type is based on the mechanism of trapping excited electrons at the insulator/semiconductor interface of the device under light illumination, which normally induces a positive shift of the threshold voltage of the device. OPTs fabricated by thermal evaporation of some oligomers including pentacene, [13][14][15][16] rubrene, 17 and others [18][19][20] are this type of devices. In addition, solution processible OPTs based on conjugated polymers, such as poly͑9,9-dioctylfluorene-co-bithiophene͒ ͑F8T2͒ ͑Ref.…”

Section: Introductionmentioning

confidence: 99%

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

Yan

Mok

2009

Journal of Applied Physics

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Organic phototransistors based on a composite of P3HT and TiO 2 nanoparticles have been fabricated, which show high photosensitivity, fast response, and stable performance under both visible and ultraviolet light illumination, and thus they are promising for applications as low cost photosensors. The transfer characteristic of each device exhibits a parallel shift to a positive gate voltage under light illumination, and the channel current increases up to three orders of magnitude in the subthreshold region. The shift in the threshold voltage of the device has a nonlinear relationship with light intensity, which can be attributed to the accumulation of electrons in the embedded TiO 2 nanoparticles. It has been found that the device is extremely sensitive to weak light due to an integration effect. The relationship between the threshold voltage change and the intensity of light illumination can be fitted with a power law. An analytical model has been developed to describe the photosensitive behavior of the devices. It is expected that such organic phototransistors can be developed for sensing different wavelengths based on different semiconducting polymers and semiconducting nanoparticles.

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“…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.…”

mentioning

confidence: 99%

“…OPTs fabricated by thermal evaporation of some oligomers including pentacene, [5][6][7][8] 2,5-bis-biphenyl-4-yl-thieno͓3,2-b͔thiophene, 9 rubrene, 10 N-͓7-͑N , N-diphenylamino͒-9,9Ј-spirobifluoren-2-yl͔-NЈ-͑2,5-di-tert-butylphenyl͒-3,4:9,10-perylenetetracarboxylicdiimide, 11 and 2,7-bis-͑N , NЈ-diphenylamino͒-2Ј,7-bis͑biphenyl-4-yl͒-9,9Ј-spirobifluorene, 12 have been found to be very photosensitive. Normally, a positive shift of the threshold voltage of a OPT can be observed under illumination, which can be attributed to trapping of electrons generated by photons at the insulator/ semiconductor interface of the device.…”

mentioning

confidence: 99%

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

Mok

Yan

Chan

2008

Applied Physics Letters

134

101

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Light sensitive phototransistor based on the composite of poly͑3-hexylthiophene͒ and TiO 2 nanoparticles has been developed. The device shows a quick change in channel current under light exposure, which can be attributed to a positive shift of the threshold voltage, while no change in the field effect mobility and off current can be observed. The shift of the threshold voltage is induced by accumulated electrons trapped by the TiO 2 nanoparticles in the channel. The photosensitivity of the device has been found to be dependent on the concentration of TiO 2 nanoparticles, the incident wavelength and the voltage between the source and drain.

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Ambipolar organic phototransistor

Cited by 32 publications

References 17 publications

Self‐Assembly of a Donor‐Acceptor Dyad Across Multiple Length Scales: Functional Architectures for Organic Electronics

Self‐Assembly of a Donor‐Acceptor Dyad Across Multiple Length Scales: Functional Architectures for Organic Electronics

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

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

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