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The Performances Of Organic Field Effect Transistors Based On Copper Phthalocyanine Derivatives

Posted on:2015-05-23Degree:MasterType:Thesis
Country:ChinaCandidate:N DongFull Text:PDF
GTID:2298330467955325Subject:Condensed matter physics
Abstract/Summary:PDF Full Text Request
Phthalocyanine derivatives with good thermal and chemical stability, easy adjusting ofthe molecular properties, high purity and being purchased directly, were widely used in lighttransmission, printing, organic field effect transistors, organic light emitting diodes and otherfields. Metal phthalocyanine molecules are applied in organic field-effect transistors at anearly stage. The morphology of metal phthalocyanine thin film and devices’ performance havebeen maken considerable research. However, the preparation of metal phthalocyaninesdevices, the growth of the film, and the way to prepare the films with better electricalproperties are still needed deep research. This paper mainly focus on the copperphthalocyanine, fluorinated copper phthalocyanine and theirs application in devices.(1) We prepared the para-sexiphenyl (p-6P) thin films through vacuum vapor method andstudied the growth way of p-6P films. The p-6P molecules could form dense film with thethickness of6nm. We employed p-6P films as the induction layer to induce phthalocyaninecompound in order to form highly-ordered films. As the results, the carrier mobility and theon/off current of organic field-effect transistor enhanced correspondingly. The p-6P filmsfunctioned as new subsrates played a role of inducing metal phthalocyanine derivatives. Thesemiconductor layers on the p-6P substrates could form highly ordered films with fewerinterfacial defects. The results showed that π-π stack direction of moleculars of two typesmaterials parallel to the substrate, which facilitated the transport of carriers. Besides, thedisk-like copper phthalocyanine and fluorinated copper phthalocyanine molecules uprightgrew on the p-6P substrates with small tilt angle. After the induction of p-6P, copperphthalocyanine and fluorinated copper phthalocyanine molecules grew with fewer grainboundary defects, and the carrier transport ability was improved.(2) We studied the morphology of para-quarterphenyl (p-4P) grown on the SiO2substrates and found that p-4P molecules could form large-area, highly ordered, smoothlaminar film. We investigated the phthalocyanine derivative organic field-effect transistors(OFETs) using a novel para-quaterphenyl (p-4P) as the inducing layer. Compared to thedevices without the p-4P inducing layer, the performances of p-type (copper phthalocyanine)and n-type (fluorinated copper phthalocyanine) OFETs with optimized thickness of p-4P thinfilms were greatly enhanced. Both the field-effect mobility and the on/off ratio of thetwo-type devices were improved by one order of magnitude compared to those of the controldevices. This remarkable improvement was attributed to the introduction of p-4P, which couldform a highly oriented and continuous phthalocyanine derivative film with the molecular π-πstack direction paralleling to the substrate.
Keywords/Search Tags:para-quarterphenpl, para-sexiphenyl, phthalocyanine derivative, organicfield-effect transistors (OFETs)
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