Synthesis And Characterization Of Organic Field Effect Transistor Based On Novel Polymer Molecules

Today is the imformation age, the transmission and sharing of information produce extremely essential effects in development of sociaty. The transmission of imformation can’t be without semiconductor materials. In last decades, semiconductor materials have received fast development and widespread attention for playing unshakable conerstone roles in informational industry. semiconductor materials are classified as organic semiconductor materials and inorganic semiconductor materials, the former one enjoys many obvious advantages, such as low-cost, large-area production, can be designed and synthesize, being clipped easily and so on. Based on those advantages,the organic field effect transistor could be greatly employed in memory devices and displays. Besides through last decades’development, the organic field effect transistor’s industrilization is coming. The organic field effect transistor as one of important aspect of semiconductor materials’application has attracted large number of experts’eyes. Now large numbers of organic semiconductors with good stability and effective transmission have been synthesized, especially the small molecular semiconductor materials’ performance can be competed with amorphous silicon. However, matched with small molecule, polymer has better processability and mechanical property. Using low-cost solution’s measure to bulid organic field effect transistor, developing good stability, solution and transmission are focus of this field now. The content of this paper is placed its considerable emphasis on synthesis of many semiconductor materials included polymers of DPPT’s series and star-shape polymers, and their variable performance’s tests.·1. We employed anthraquinone, dione-benzodithiophene and dione-benzodifuran to copolymerize with DPPT to obtain three copolymers. Character structure and performance of three polymers of DPPT’s series, for instance GPC, TGA, DSC, UV, CV, Gaussian calculation, AFM, XRD and OFET’s performance test. The TGA and DSC show the polymers have good thermostability. The UV and CV demonstrate that three polymers are with narrow band and good redox stability. Using AFM and XRD to exhibit film morphology under different annealing temperature. The result reveals that the PDPPT-DBADO can form continuing film under annealing temperature of 160℃, and other two polymers at 160℃ form continuing films. At last, we bulid three polymers’transistors respectively to exploit their OFET’s performance. Three polymers are all bipolar semiconductors.·2. To research the effect of number and position of carbonyl on polymers’ polarity and electrical property, we employ cyclopentabithiophene-one, dione-benzo(4,8)dithiophene and dione-benzodithiophene as acceptors to copolymerize with DPPT to obtain three copolymers. The TGA and DSC show the polymers have good thermostability. The UV and CV demonstrate that three polymers are with narrow band and good redox stability.·3. the aim of this project is researching the delicate tune of monomers’content to the polymers’electron and hole’s injection by administrating energy level. We employ bithiphiophene, DPP, bithiazolthiazole to build five random copolymers with different ratio of structural units. To three structural units, we perform the test ofGaussian calculation which shows bithiazolthiazole possesses strong electrophilicity. The TGA show the polymers have good thermostability. The UV demonstrates that three polymers are with narrow band and wide absorption in ultraviolet visible light region, some absorption even happens in near infrared region which could have favorable effects on being applied in Organic photovoltaics.·4. Synthesize and indentify two star-shape polymers. Three conjugate arms are connected on a center of conjugate to achieve triangular facet-shape conjugate. Two conjugate centers are terthienobenzene and 2-(3,5-di(thiophen-2-y1)phenyl)thiophene respectively. We perform the test of GPC, TGA, UV, OFET’s performance to identify those copolymers’struction and performance. The UV shows the polymer with core of terthienobenzene has larger conjugate. The TGA show the polymers have good thermostability. The test of OFET’s performance validates polymer has P-performance.