Fabrication of organic semiconducting materials and high-performance organic thin-film transistors based on electron-irradiated polystyrene = 전자빔에 조사된 폴리스티렌을 이용한 반도체성 유기 발광물질 및 고성능 유기박막트랜지스터 제조

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It was discovered that non-luminescent polystyrene (PS) can be converted to luminescent materials whose color can be changed in a wide visible range by electron irradiation. After the analyses of electron-irradiated PS, it was found that polycyclic aromatic hydrocarbons are produced by the irradiation and these PAHs are the origin of the luminescence from the electron-irradiated polymer. Based on the finding, a straightforward approach to produce desired light-emitting nanoarchitectures and nanopatterns only by irradiating an electron beam to the polymer was presented. In particular, the top-down irradiation approach provides a powerful tool to fabricate a variety of interesting nanoarchitectures when combined with bottom-up approaches; PS nanostructures prepared by self-assembling techniques can be directly transformed to luminescent nanostructures by electron irradiation while keeping their pristine morphologies. Light-emitting materials are widely used for optical, photonic, chemical and biomedical devices and a rapid progress in the devices requires well-defined luminescent nanoarchitectures. The approach presented here will be useful for a wide range of research fields including optics, photonics, chemistry, and biologics. On the other hand, a very simple but effective approach to produce high-performance rubrene organic thin-film transistors (OTFTs) with characteristics better than amorphous silicon TFTs was presented. Only by an abrupt heating process, high-quality crystalline rubrene semiconductor thin films that have almost ideal structures for OTFTs are created. The produced crystalline thin films consist of highly ordered, uniaxially oriented single-crystalline grains with large average sizes and the grains are interconnected with one another to form continuous films over the whole dielectric surfaces. Such high-quality crystalline rubrene thin films are remarkably rapidly produced in just 30 sec through this approach. Moreover, the increase of car...
Advisors
Cho, Sung-Ohresearcher조성오researcher
Description
한국과학기술원 : 원자력및양자공학과,
Publisher
한국과학기술원
Issue Date
2011
Identifier
466430/325007  / 020075146
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 원자력및양자공학과, 2011.2, [ vi, 73 p. ]

Keywords

polystyrene; organic thin-film transistors; luminescent nanostructures; electron irradiation; rubrene; 루브렌; 폴리스티렌; 유기박막트랜지스터; 발광나노구조체; 전자빔조사

URI
http://hdl.handle.net/10203/49041
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=466430&flag=dissertation
Appears in Collection
NE-Theses_Ph.D.(박사논문)
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