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Organic field effect transistor and applications in ultraviolet sensing

A transistor and organic field technology, applied in the field of organic field effect transistors, can solve the problems of inability to judge the wavelength selectivity of materials, low device performance, and no widespread concern, and achieve good device stability and high carrier mobility. , Sensitive effect of detection signal

Active Publication Date: 2015-03-04
INST OF CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The initial reports on phototransistors of organic conjugated small molecules did not attract widespread attention because the device performance of these phototransistors was much lower than that of inorganic phototransistors (R≥300A / W)
In 2008, Cho et al reported a phototransistor based on 4(HPBT)-benzene thin film (Adv.Funct.Mater.2008,18,2905-2912), for a wavelength of 436nm and an intensity of 6.8-30μW / cm 2 The visible light exhibits a photoresponsivity of 2500-4300A / W and a 10 4 photosensitivity, but the carrier mobility is only 0.0013cm 2 / (Vs)
In 2010, Guo et al. prepared a phototransistor based on Me-ABT single crystal (Adv. Funct. Mater. 2010, 20, 1019-1024). Due to the great reduction of defects and grain boundaries in the single crystal structure, the semiconductor material The solid-state stacking structure has been significantly improved, and the photoresponsivity, photosensitivity and carrier mobility of the device have reached 12000A / W, 6000 and 1.66cm 2 / (Vs), but in this report only the light intensity is 30μW / cm 2 The white light was tested
Most of the organic phototransistor materials and devices reported so far only use a single light source for photoresponse testing. Even if a high-sensitivity response performance is observed, there is no comparison of device performance (stable differential response) under irradiation with other wavelengths. Determining the Wavelength Selectivity of Materials

Method used

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  • Organic field effect transistor and applications in ultraviolet sensing
  • Organic field effect transistor and applications in ultraviolet sensing
  • Organic field effect transistor and applications in ultraviolet sensing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] The preparation of the compound shown in embodiment 1, formula II

[0083] 1) Under nitrogen atmosphere, slowly add n-butyllithium (1.1eq.) into anhydrous solution of benzo[1,2-b:4,5-b']dithiophene (1eq.) cooled to -78℃ In the ether solution, after the temperature of the solution was gradually raised to room temperature and stirred for 3 hours, N,N-dimethylformamide (1.1 eq.) was added and stirred overnight. The reaction solution was quenched with dilute hydrochloric acid aqueous solution, extracted with ether and washed with saturated brine, then fully dried with magnesium sulfate, and the mixture after vacuum spin-drying was separated and purified by column chromatography to obtain benzo[1,2-b:4,5- b'] dithiophene-2-carbaldehyde;

[0084] 2) Slowly add titanium tetrachloride (1.15eq.) to the tetrahydrofuran suspension of zinc powder (2.3eq.) and heat the solution to reflux. After 4 hours, the dissolved benzo[1,2-b:4 ,5-b']dithiophene-2-carbaldehyde (1eq.) and pyridi...

Embodiment 2

[0088] The preparation of the compound shown in embodiment 2, formula III

[0089] a) Under nitrogen atmosphere, slowly add n-butyllithium (1eq.) into benzo[1,2-b:4,5-b']dithiophene (1eq.) in anhydrous THF cooled to -78℃ solution, slowly add I at this temperature 2(1eq.) in tetrahydrofuran, stirred for 12 hours after the mixture rose to room temperature. After the reaction solution was quenched with water, it was filtered and rinsed with a solvent (petroleum ether), and the resulting mixture was separated and purified by column chromatography to obtain 2-iodobenzo[1,2-b:4,5-b']dithiophene;

[0090] b) Add 2-iodobenzo[1,2-b:4,5-b']dithiophene (1eq.), tetrakis(triphenylphosphine)palladium (0.1eq.) and 2,6- Bis(tributyltin)acetylene (0.5 eq.) was slowly added to a solution of di-tert-butyl-4-methylphenol (catalytic amount) in anhydrous toluene, and the reaction solution was heated to reflux and stirred for 1 day. After the reaction solution was cooled to room temperature, the ...

Embodiment 3

[0093] The preparation of the compound shown in embodiment 3, formula IV

[0094] Referring to the method provided in the literature J.Mater.Chem., 2010,20,10931-10935, with 2-iodobenzo[1,2-b:4,5-b']dithiophene and C 12 h 25 MgBr is raw material, prepares and obtains 2-dodecylbenzo[1,2-b:4,5-b'] dithiophene; Then with 2-dodecylbenzo[1,2-b:4, 5-b']dithiophene is used as a raw material to prepare the compound represented by formula IV by referring to the preparation method of the compound represented by formula II above.

[0095]

[0096] The structural characterization data of the compound shown in formula IV: Mp: >300°C; MS (EI) m / z: 740 (M + ); Elemental analysis results: C: 74.31, H: 8.42.

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Abstract

The invention provides an organic field effect transistor which uses a compound shown in a formula I as described in the specifications as an organic semiconductor layer, and a manufacturing method thereof and applications thereof. In the formula I, R1 and R2 can be the same or different and selected from at least one of hydrogen, substituted or unsubstituted C1-C50 alkyl, and substituted or unsubstituted C6-C50 aryl, and X is C=C or C-C triple bond. The organic field effect transistor has excellent device stability, the sensing response difference for incident lights of different wavelengths is significant, an extremely sensitive sensing response to an UVA with the light intensity to be only 37muWcm<-2> and the wavelength to be 365 to 420nm, light responsibility (R) exceeds 6000A / W, photosensitivity (P) can maximally reach 6.75*105, and thus the organic field effect transistor can be used for manufacturing an ultraviolet sensor, photosensitivity of the manufactured ultraviolet sensor in UVA is basically not changed along with changes of the light intensity, and great advantages are provided in the aspect of incident light distribution region reverse detection.

Description

technical field [0001] The invention relates to the fields of organic field effect transistors and optical sensing, in particular to a class of organic semiconductor materials containing benzo[1,2-b:4,5-b']dithiophene dimers and organic semiconductor materials based on such materials. A field effect transistor, a preparation method of the organic field effect transistor and its application in ultraviolet light sensing. Background technique [0002] Organic field-effect transistors (OFETs) are active devices that utilize an electric field to regulate the conductivity of organic semiconductor materials. Over the years, organic field effect transistor materials and devices have been greatly developed due to their great advantages in large area, low cost, flexible preparation, and solution processing. In recent years, with the help of the physical and chemical properties of organic semiconductor materials and the sensitive detection ability of transistors for small currents, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/30H01L51/05H01L51/40
Inventor 孟青赵广耀刘洁邹业胡文平
Owner INST OF CHEM CHINESE ACAD OF SCI
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