Thèses sur le sujet « Carbon Nano-structured Thin Films »

The first study researched turbulent forced convective heat (mass) transfer down- stream of blockages with round and elongated holes in a rectangular channel. The blockages and the channel had the same cross section, and a distance equal to twice the channel height separated consecutive blockages. Naphthalene sublimation experiments were conducted with four hole aspect ratios (hole-width-to-height ratios) and two hole-to-blockage area ratios (ratios of total hole cross-sectional area to blockage area). The effects of the hole aspect ratio, for each hole-to-blockage area ratio, on the local heat (mass) transfer distribution on the exposed primary channel wall between consecutive blockages were examined. Results showed that the blockages with holes enhanced the average heat (mass) transfer by up to 8.5 and 7.0 times that for fully developed turbulent flow through a smooth channel at the same mass flow rate, respectively, in the smaller and larger hole-to-blockage area ratio (or smaller and larger hole diameter) cases. The elongated holes caused a higher average heat (mass) transfer and a larger spanwise variation of the local heat (mass) transfer on the channel wall than did the round holes. The second study explored the heat transfer enhancement for pool boiling on nano-structured surfaces. Experiments were conducted with three horizontal silicon surfaces, two of which were coated with vertically aligned multi-walled carbon nanotubes (MWCNT) with heights of 9 and 25 ¹m, respectively, and diameters between 8 and 15 nm. The MWCNT arrays were synthesized on the two silicon wafers using chemical vapor deposition. Experimental results were obtained over the nucleate boiling and film boiling regimes under saturated and sub-cooled (5±C and 10±C) boiling conditions. PF-5060 was the test fluid. Results showed that the MWCNT array with a height of 25 ¹m enhanced the nucleate and film boiling heat fluxes on the silicon surface by up to 380% and 60%, respectively, under saturated boiling conditions, and by up to 300% and 80%, respectively, under 10±C sub-cooled boiling conditions, over corresponding heat fluxes on a smooth silicon surface. The MWCNT array with a height of 9 ¹m enhanced the nucleate boiling heat flux as much as the taller array, but did not significantly enhance the wall heat flux in the film boiling regime.

La nano-impression est une technique de lithographie qui consiste à reproduire les motifs contenus dans un moule, par pressage de celui-ci sur un film de résine. Cette technologie – rapide et peu coûteuse à mettre en oeuvre – est prometteuse mais son utilisation à l’échelle industrielle nécessite encore des améliorations notamment en termes de limitation de la défectivité des motifs reproduits. Des solutions existent pour pallier cette limitation, à travers notamment l’utilisation de traitements antiadhésifs qui se greffent en surface des moules et permettent de favoriser les étapes de démoulage. Cependant, ces traitements de moules ont une durée de vie limitée, ce qui limite la rentabilité globale du procédé de nano-impression.Ce projet de thèse s’intéresse à la question de la durabilité des moules et propose des matériaux alternatifs pour la fabrication de moules de nano-impression.Pour répondre aux exigences des acteurs de la nano-impressions, quatre matériaux (le Diamond-like carbon, le carbure de silicium et leurs versions dopées en fluor) ont été développés pour une utilisation en tant que matériaux de moules alternatifs au silicium et au quartz. La caractérisation des propriétés physiques et physico-chimiques a été réalisée de sorte à sélectionner les matériaux les plus prometteurs qui ont ensuite été structurés pour une utilisation en tant que moules fonctionnels.Les propriétés d’adhérence de ces matériaux ont ensuite été caractérisées tant en nano-impression assistée par ultraviolets qu’en nano-impression thermique. Ces essais ont permis de montrer que les matériaux développés, malgré une grande énergie de surface, présentent intrinsèquement un caractère antiadhésif lié à leur inertie chimique
Nanoimprint is a lithography technology which consists in structuring a polymer film by pressing a structured mold into it. This promising method is low-cost and has a high throughput, but its implementation in industry still requires improvements, particularly regarding the defectivity of imprinted structures. To circumvent this defectivity, the use of antiadhesive treatments, grafted to the mold surface has been developed to facilitate the demolding step. However, these treatments have a limited lifespan, thereby empeding the global nanoimprint cost-effectiveness.This thesis focuses on mold durability and suggests alternative materials for the fabrication of nanoimprint molds.To match nanoimprint requirements, four materials (Diamond-like carbon, Silicon carbide and their fluorine-doped versions) were developed to be used as alternatives to silicon and quartz. Physical and physico-chemical characterization were carried out, so as to determine the best candidates that were then patterned, leading to usable molds.Adhesion properties of these materials were then characterized both in UV-nanoimprint and thermal-nanoimprint procedures. These investigations showed that despite their high surface energies, the developed materials exhibit intrinsically antiadhesive properties, thanks to their chemical inertness

In this century some of our main issues are energy shortage and pollution. This work will briefly describe these problems, proposing a plan of action combining energy saving and different sustainable energy sources. Within different types of renewable energy sources, solar energy is the most abundant one. To make solar energy a more sustainable and cost effective technology we focus on enhancing the optical characteristics of thin film solar cells. In this category, organic solar cells are good options for their exiguous amount of material and the low energy needed for the fabrication process. This technology can be lightweight, transparent, flexible and conformal in order to be applied to and integrated in various architectural solutions and consumer electronics. After a study of the physics of such devices and on how to optically enhance their performances, we will show some examples where we theoretically and experimentally collect the solar radiation with optical antennas. We report, for the first time in literature, a nanogap antenna that efficiently couples the light in our active material thin film. Finally, we elaborate on the concept of building integrated photovoltaics introducing some examples of solar façades. Based on our research, we are able to design and fabricate an organic transparent solar cell with a visible transparency above 20% and an optically enhanced photon-electron conversion efficiency remarkably similar to its opaque equivalent.
En el presente siglo, algunas de las prioridades son la escasez de la energía y la contaminación. Este trabajo describirá brevemente estos problemas y propondrá un plan de acción que combina el ahorro energético con diferentes fuentes sostenibles de energía. Dentro de estas fuentes de energía renovables, la energía solar es la más abundante. Con el objetivo de hacer la tecnología solar más sostenible y eficiente económicamente nos concentramos en aumentar las características ópticas en celdas solares de película delgada. Dentro de esta categoría, las celdas solares orgánicas son una buena opción porque su desarrollo requiere bajas cantidades de materiales y su fabricación es de baja energía embebida. Adicionalmente, esta tecnología puede ser liviana, transparente, flexible mecánicamente y modular para ser aplicada e integrada en varias soluciones arquitectónicas y de electrónica de consumo. Luego de estudiar los procesos físicos en tales dispositivos y de determinar las metodologías para aumentar ópticamente sus desempeños, mostraremos algunos ejemplos donde teórica y experimentalmente se colecta la radiación solar mediante antenas ópticas. Se reporta por primera vez, una antena de nanogap que acopla eficientemente la luz en la capa activa de la celda solar. Finalmente, se desarrolla el concepto de tecnología fotovoltaica integrada en edificaciones tras introducir algunos ejemplos de fachadas solares. Basados en nuestra investigación, fue posible diseñar y fabricar una celda solar orgánica transparente cuya transparencia en el rango visible estuvo por encima del 20% y una eficiencia de conversión foton-electron aumentada ópticamente que resulto notoriamente similar a la celda solar orgánica opaca equivalente.
La rareté grandissante des ressources en énergie associée à une augmentation de la pollution font partie des enjeux plus importants de ce siècle. Cette thèse décrira brièvement ces deux problématiques et proposera un plan d’action combinant économie d’énergie et diversité des sources d’énergies renouvelables. Parmi les formes d’énergies renouvelables disponibles, l’énergie solaire est la plus abondante. Pour faire de l’énergie solaire une ressource plus durable et plus rentable économiquement, nous proposons d’amplifier les propriétés optiques de cellules solaires en couches minces. Dans cette catégorie, les cellules solaires organiques représentent un choix pertinent de part la faible quantité de matériau nécessaire ainsi que la faible énergie nécessaire au procédé de fabrication. Cette technologie peut être légère, transparente et flexible de sorte qu’elle peut être utilisée dans différentes solutions architecturales s’adaptant à des produits électroniques pour le grand publique. Suivra la théorie sous jacente à ces dispositifs et l’explication de la manière dont leurs performances sont améliorées. Nous présenterons quelques exemples où l’on collecte la radiation solaire avec une antenne optique. Ainsi, nous faisons la toute première démonstration d’une antenne auto-assemblée qui couple efficacement la lumière dans le matériau constituant la couche mince que nous utilisons. Finalement, nous développons le concept de cellules photovoltaïques intégrées en présentant différents cas de façades solaires. Ces travaux nous ont permis de concevoir et de fabriquer une cellule solaire organique transparente avec une transparence dans le visible de 20% et une efficacité de conversion photon-électron améliorée, similaire à une cellule équivalente opaque.
La difficile reperibilità di risorse energetiche e l’inquinamento sono alcuni dei problemi più importanti di questo secolo. In questo lavoro saranno presentati brevemente questi temi proponendo un piano d’azione che abbini il risparmio energetico alle differenti fonti di energia rinnovabili. Nell’insieme delle fonti energetiche rinnovabili l’energia solare è senz’altro la più abbondante. Con l’obbiettivo di rendere lo sfruttamento di tale energia più sostenibile ed economicamente vantaggioso, ci premuriamo di migliorare le caratteristiche ottiche di celle fotovoltaiche a film sottile. In questa categoria utilizziamo, tra le diverse opzioni, le celle solari organiche in quanto la loro fabbricazione richiede una quantità di materiale minimo e un basso consumo energetico. Inoltre questi tipi di dispositivi possono essere leggeri, trasparenti, flessibili e conformabili alle superfici su cui sono applicati. Questa è una tecnologia che potrebbe essere implementata e integrata in varie soluzioni architettoniche o nell’ elettronica di consumo. Dopo aver presentato i principi fisici di tali dispositivi e determinato le metodologie ottiche per aumentarne le prestazioni, vengono illustrati alcuni esempi dove, teoricamente e sperimentalmente, riusciamo a intercettare la radiazione solare con antenne ottiche. Riportiamo, per la prima volta in letteratura, un’antenna ottica con nano-gap che accoppia efficacemente la luce solare nel nostro materiale attivo a film sottile. Nell’ultima parte sviluppiamo il concetto di tecnologia solare integrata negli edifici, introducendo alcuni esempi di facciate solari. Basando il design sulla nostra ricerca, è possibile realizzare una cella solare fotovoltaica organica trasparente, con una trasparenza superiore del 20% e un’ efficienza di conversione fotone-elettrone migliorata grazie all’ottica, che risulta molto vicina all’ equivalente cella fotovoltaica organica non trasparente.

Planar two-dimensional (2-D) nanostructured indium oxide (InOx) and one-dimensional (1-D) tin oxide (SnO2) semiconductor metal-oxide layers have been utilised for gas sensing applications. Novel layered Surface Acoustic Wave (SAW) based sensors were developed consisting of InOx/SiOxNy/36°YXLiTaO3, InOx/SiNx/SiO2/36°YXLiTaO3 and InOx/SiNx/36°YXLiTaO3 The 1 µm intermediate layers of silicon oxynitride (SiOxNy), silicon nitride (SiNx) and SiO2/SiNx matrix were deposited on lithium tantalate (36°YXLiTaO3) substrates by r.f. magnetron sputtering, electron-beam evaporation and plasma enhanced chemical vapour deposition (PECVD) techniques, respectively. As a gas sensitive layer, a 100 nm thin layer of InOx was deposited on the intermediate layers by r.f. magnetron sputtering. The targeted gases were ozone (O3) and hydrogen (H2). An intermediate layer has multiple functions: protective role for the interdigital transducers' electrodes as well as an isolating effect from InOx sensing layer, thereby improving the sensor performance. The developed SAW sensors' exhibited high response magnitudes with repeatable, reversible and stable responses towards O3 and H2. They are capable of sensing concentrations as low as 20 parts-per-billion for O3 and 600 parts-per-million for H2. Additionally a conductometric type novel sensing structure of SnO2/36°YX LiTaO3 was also developed by depositing a thin layer of SnO2 nanorods by PECVD. The gas sensing performance exhibited repeatable, reversible, stable responses towards NO2 and CO. The surface morphology, crystalline structure and preferred orientation of the deposited layers were investigated by Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD). A polycrystalline, oxygen deficient non-stoichiometric InOx with grain sizes of 20-40 nm was revealed. The 1-D nanostructures were characterised by Transmission Electron Microscopy (TEM) showing nanorods with needle-like shape , diameters of 10-20 nm a t the top and 30-40 nm at the base as well as a preferential growth orientation of [ ] on the LiTaO3 substrate. The developed sensors are promising for O3, H2 and CO sensing.

碩士
國立中正大學
物理學系暨研究所
99
Pulsed laser deposition is a versatile method for growing thin films, composed of widely various materials, with and without nanostructures. Its great capability lies in its ability to non-thermally and congruently transfers material from a multi-component target onto a substrate on a layer-by-layer basis. Furthermore, ultrafast-pulse laser deposition provides much higher tunability in the ionization state and momentum of the plasma ions in the plume, offering more control factors for guiding film growth. 　　With this technique, unknown and novel carbon thin films, composed of nano-particles self-organized into regular micrometer-scale patterns, were produced successfully by deposition of laser-ablated graphite on glass substrates. A systematic study by varying laser duration, fluence, on-target beam size, film thickness, distance between target and substrate, substrate material, and substrate temperature was conducted. The dependence of the micrometer-scale organization on laser parameters reveals the unexploited potential of ultrashort-pulse laser deposition for controlled growth of novel nano- and micro-structured thin films.

碩士
中原大學
奈米科技碩士學位學程
106
A luminescent solar concentrator (LSC) is consisted of the luminophores and a waveguide that can be used to spatially concentrate both direct and diffused sunlight without the need of complex and expensive solar-tracking and cooling systems. Recently, colloidal quantum dots (CQDs) with some unique photophysical properties have attracted much attention as the luminophores in LSCs. However, most of mature CQDs contain heavy metals and need to be synthesized in the hazardous organic solvent. In addition, they also suffered from concentration-induced quenching (CIQ), thus the loading concentration of luminophores doped in LSCs is restricted. Unfortunately, this would reduce the light-absorbing efficiency, leading to large transmission losses. To address all the issues mentioned previously, organosilane-functionalized carbon nanodots (Si-CNDs) were synthesized based on cost-effective, earth-abundant precursors using a simple hydrothermal method. Such Si-CNDs exhibit some unique photophysical properties, including large absorption coefficient, high PL quantum yields (PL-QYs) and resistance to CIQ effect. Due to good film-forming properties, greener LSCs with different loading concentrations can be simply fabricated by directly cross-linking Si-CNDs on the glass waveguide. The LSCs are highly transparent even under high loading concentration up to 75 wt%, indicating high uniformity of Si-CND distribution. The LSCs with 25 wt% loading contents still possess high solid-state PL-QYs up to ~41% upon the calibration of reabsorption losses and high internal quantum efficiency of ~23% due to low scattering losses. We expect our demonstration can pave a way to further design efficient greener LSCs after further reducing the reabsorption losses.

碩士
國立成功大學
化學工程學系
104
This thesis concerns the developments of flexible transparent conductive electrodes and supercapacitors using carbon nanotube (CNT), reduced graphene oxide, and their hybrids with conducting polymer poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS). At first, the CNT and rGO-based thin films were fabricated as flexible transparent conductive electrodes by the blade-coating of CNT or graphene oxide (GO) dispersion on polyethylene terephthalate (PET) and the followed GO reduction with hydroiodic acid for the case of GO. The decreases of transmittance and sheet resistance with the increase of layer numbers have been described. Secondly, CNT or GO (0~0.1wt%) was added to the equal volume mixture of PEDOT:PSS and dimethyl sulfoxide (DMSO) to yield homogeneous dispersions. For the case of GO, the dispersion was further microwave-treated to obtain the rGO dispersion. Then, the CNT or rGO dispersion was blade-coated on PET to form the CNT/PEDOT:PSS or rGO/PEDOT:PSS hybrid thin films as flexible transparent conductive electrodes. It was found that the appropriate addition of CNT or rGO indeed could effectively enhance the conductivity via the formation of conductive network. The lowest sheet resistance around 1000 Ω with a transmittance above 80% was obtained for both the hybrid thin films. Finally, it was demonstrated that both the CNT/PEDOT:PSS and rGO/PEDOT:PSS hybrid thin films also could be used as the electrodes for supercapacitors. The capacitance could be raised by appropriately increasing the thickness of hybrid thin films. Furthermore, the flexible transparent all-solid-state supercapacitors were fabricated with polyvinyl alcohol/sulfuric acid (PVA/H2SO4) gel electrolyte between two CNT/PEDOT:PSS or rGO/PEDOT:PSS hybrid thin film-based electrodes. It was found that both the resulting supercapacitors had transmittances above 56% and could be quickly charged and discharged. Also, their electrochemical performance could be retained while bending. All the results revealed that both the CNT/PEDOT:PSS and rGO/PEDOT:PSS hybrid thin films could be developed as good electrode materials for flexible transparent supercapacitors.

博士
國立中興大學
電機工程學系所
106
In this study, first of all, we made a composite thin film with multi wall carbon nanotubes and AZO. The ratio of the MWCNT in sol–gel solution ranges from 0.01 to 1.0 wt.%. This study investigates the effects of MWCNT ratio on structural, electrical, and optical properties of AZO:MWCNT thin films. The XRD analysis showed a strong (0 0 2) peak along the c axis at 2θ ~ 34.4o indicating a hexagonal wurtzite structure for the AZO:MWCNT thin films. The intensity of (0 0 2) peak decreased with the increasing MWCNT ratio, revealing that AZO were bounding with the MWCNTs. The sheet resistance of AZO:MWCNT thin films significantly decreased from 1.38 × 104 to 10.5 Ω/□ with increasing the MWCNT ratio from 0.01 to 1.0 wt.%; meanwhile, the optical transmittance in the visible wavelength region decreased from 87.9% to 12.1%, respectively.Second, a reduced graphene oxide and AZO thin film had been made. The sheet resistance of the films was reduced when the rGO ratio increased from 0 to 3.0 wt%. The optical transmittance of the composite film decreasedwith increasing the rGO ratio from 0 to 3.0 wt%. The average optical transmittance (400–700 nm) of the AZO/rGO composite thin film within 1.0 wt% rGO was above 81% and the sheet resistance was 430Ω/□. Finally, .a highly stable, transparent, and flexible composite electrode was developed using reduced graphene oxide (rGO)/AgNWs/Ga–doped zinc oxide (GZO) composite thin films. TherGOfilm was first spin　coated on flexible substrates and used as an adhesion enhancement layer.　The AgNWs, which were used as a primary conductor, formed a random percolating network embedded between the rGO and GZO films. TheGZO film was sputtered on the surface of the AgNWsand was used as a protective layer to prevent the oxidation of　the AgNWs. The rGO/AgNWs/GZO composite thin film exhibited excellentelectrical conductivity and superior stability to a monolayer or a bilayer TCF. The sheet resistance of the composite film was 5.5±0.5 Ω/□ when exposed to the atmosphere for 60 days. The rGO/AgNWs/GZO composite film exhibited an optical transmittance of approximately 84% at a wavelength of 550 nm. A bending test was conducted for 600 cycles with a curvature radius of 1 cm, and the test results revealed that sheet resistance of the composite film varied by less than 10%. The developed rGO/AgNW/GZO transparent conducting thin films have potential for use in future flexible optoelectronic devices.

碩士
國立聯合大學
材料科學工程學系碩士班
105
In this study, the molybdenum nitride, MoN, multilayer coatings modulated by single layer molybdenum nitride with distinguished structure was proposed. The microstructures with crystalline, preferred orientation and featureless structure, respectively, are fabricated by magnetization sputtering with the input power and gas inlet control. Three kinds of multilayer coatings were successfully prepared by stacking of MoN single layer coating of above mentioned three structural features. The structure of the multilayer coatings were controlled at a total of 20 layers and 1 um, while each building layer was 50 nm. Sample M1-2, which is formed by alternately stacking of the crystalline and the preferred orientation structure, exhibits a strong suppression on formation of the preferred orientation, and the columnar crystalline structure is confined to each of the building layers. On the other hand, the continuous columnar crystalline structure are observed in the microstructure of M1-7and M2-7 which are made of crystalline/amorphous, and preferred orientation/amorphous structures, respectively. The atoms in the amorphous layer are easily to grow along the grain in the previous layer. In particular, the continuous columnar crystalline structure with (111) preferred orientation grown through several layers is observed in the M2-7 coating. The multilayers showed excellent adhesion as compared to the single layer coatings. M1-7 exhibited the superior adhesion, strength with almost no peeled coating fragments around the edges of the pit. The tribological behavior of multilayer and single layer was also discussed.

碩士
國立成功大學
材料科學及工程學系碩博士班
100
In this research, TaN is used as a metal gate due to its excellent conductivity, thermal stability, and tunable work function. A reactive magnetron sputtering system is used to deposit TaN thin films with various deposition parameters, such as the working pressures and deposition powers. The film thickness is measured by a profilometer. The sheet resistance is characterized by a four-point probe. The surface morphology and structures are characterized by scanning electron microscopy and X-ray diffraction, respectively. The electrical results are characterized by a probe station equipped with a LCR meter. The effects of different working pressures and working powers on sheet resistance, deposition rate, crystallinity, grain size, particle size and work functions are investigated in this research. We found the TaN thin films made at higher working power (〉 85W) and lower deposition pressures (〈 7 mTorr) are with reasonable good conductivity and nanocrystallinity. The work function of TaN made at 100W and 5 mTorr is 5.07 eV which is promising for P-MOS application.

碩士
國立臺灣科技大學
化學工程系
102
The discotic liquid-crystals (DLCs) systems are appealing in organic electronics because of their solution-processibility and controllable inter-molecular ordering. Generally, these orderings are induced by the strong inter-planar π-π interactions and result in columnar self-assembly with hexagonal arrangement. These systems are expected to gives rise to better semiconducting properties with the charges hopping along stacks of π-conjugated planes. Therefore, to control the orientation of the column stakes between two electrodes would be an important issue in designing semiconducting devices, such as field-effect transistors. In the first part of this study, the orientations and structures of several discotic liquid crystals on surface were characterized using reflection-absorption infrared spectroscopy (RAIRS), powder X-ray diffractometer, polarizing microscope (POM) and atomic force microscope (AFM) to investigate the film structure. In the second part, in order to understand the semiconducting properties and packing behaviors of DLCs in different environments, the film structure on planar substrate and nanopillar-templated substrate were examined. Less morphological imperfections were observed when DLC films were formed on nanopillar-templated surfaces, compared to that on a planar surface. The sidewalls of nanopillars appear to assist the growth of DLCs into columnar alignment with their long-axis parallel to the nanopillar and against the substrate. FET devices are also fabricated for these materials. The mobility was measured in TC4TBC based lateral transistor devices and reached 7.59E-4 cm2V-1s-1. Field effect mobilities were measured for all four materials in vertical transistor configuration.

碩士
長庚大學
光電工程研究所
106
We want to reduce using toxic solvent on the preparation of perovskite solar cell, so we try to change the toxic solvent(DMF or DMSO) to DI water and the lead precursor from PbI2 to Lead acetate. Through two-step preparation, we dipped in MAI solution then transform Perovskite crystallization. But the PCE% compared with using lead nitrate precursor solution to prepared Perovskite solar cell is much lower. Therefore we try to observe surface and electrical through the following instrument: Contact Angle Measure, SEM, EDS, PV Characterization System etc., hope can learn more about water-soluble lead acetate precursor. At the end, the short current, open circuit voltage and fill factor have all been increased it’s because of enhancing surface crystallization flatness and coverage. And the Power conversion efficiency increased from 1.784% to 3.723%.

博士
國立中正大學
物理所
98
In this thesis, we focus on the fabrication and research of periodic nano- and micro- optical application structures by self-assembly process. The scales of self-assembly in this thesis were classified as three parts. First, in sub- micro scale, the capillary fore play an important role in the self-assembly process. For example, the spheres in solutions, called colloids, are easily aggregated by capillary force in drying process at room temperature. The spheres always self-assemble into close-packed structures, e.g. face-centered cubic crystals. In our experiments, the colloid SiO2 particles are self-assembled into f.c.c. crystals by capillary force. Such crystals are called “artificial opal”, similar the “opal” in nature can be applied as photonic crystals (PCs). Furthermore, due to the more wide open photonic band gap, the inverse opal is fabricated based on opal templates for more useful applications. In molecular (nano-) scale, the self-assembly can be classified with two types, intra- and inter- molecular self-assembly. In intra- molecular self-assembly, such as protein folding, the structures become stable and regular architectures from random coil polymers. In inter- molecular, such as block copolymers (BCPs) self-assembled with nano- morphologies by phase-separation effect, form a supramolecular from micelle molecules in solution. In micro- scale, the moistures condense on the solution surface of mixing polystyrene and solvent by evaporation-cooling effect which forms to hexagonal porous, called “Breath Figures” (BFs). The advanced applications in microlens and optical diffuser films from BFs will be discussed

碩士
國立臺灣大學
工程科學及海洋工程學研究所
98
In recent years, flexible electronics gradually make a figure in technology fields. To illustrate, organic materials play an important role in flexible electronics. More and more products using organic materials have been developed, such as the screen of many smart phones, the application of active matrix organic light emitting diodes. Organic materials are usually produced by solution process on the soft substrate. Ink-jet printing is a common solution process, which has low cost, high maneuverability and other advantages. In this thesis, with the combination of the semiconductor process and ink-jet printing process system, two kinds of organic transistors are made under the circumstance of environmental control, surface treatment, and temperature control. One used silicon wafer as the substrate, and then was printed with the semiconductor material, P3HT, on the wafer. The other was all ink-jet printing organic thin film transistor, which was fabricated with organic polymer materials in each layer by ink-jet printing process. The performance of its devices has achieved world class standards. (On/off current ratio is 106 order, and the mobility is 5×10-3 cm2/V‧s) In the process of fabricating organic transistors, the performance of transistors was improved by blending the nano carbon particles into P3HT. The performance of organic field effect transistors was nearly six times higher, the performance of the organic thin film transistors was about five times higher.

碩士
清雲科技大學
電子工程系所
97
In this paper, we report an all-soluble process for the carbon nanotube organic thin film transistors (CNT-OTFTs) by combining the liquid-phase-deposition (LPD) oxide, soluble CNTs and nano-metal particles. First, the CNT powders are dissolved in the sodium sulfate (SDS) and water by the ultrasonic mix. Then the CNT films are coated by spin-on process and baked in 90oC. In this report, the CNT layers are used as the active channel and metal electrodes. In some devices, we use the silver as the electrodes. For the silver electrodes, the nano silver particles are dissolved in the ethylene glycol in the different ratios. In order to avoid the organic solvent damage the underlying layer and suppress the leakage current in the OTFTs, we use a water-based LPD silicon oxide as the gate insulator and passivation layer. This oxide is deposited at 50oC by using the hydrofluosilicic acid (H2SiF2) and water. In this report, the top-contact CNT-OTFTs are completed without using any vacuum process. Before coating the CNT films as the channel layer and electrodes, the CNT solution is filtered and the undissolve CNT powders is removed. After completing the CNT OTFTs., the electrical properties of these devices are measured by the Agilent 4156C in the air. Due to both the CNTs and silicon oxide are air-stable materials, the devices by using new process show the good characteristics

碩士
清雲科技大學
電子工程研究所
97
In this paper, we report an all-soluble process for the carbon nanotube organic thin film transistors (CNT-OTFTs) by combining the liquid-phase-deposition (LPD) oxide, soluble CNTs and nano-metal particles. First, the CNT powders are dissolved in the sodium sulfate (SDS) and water by the ultrasonic mix. Then the CNT films are coated by spin-on process and baked in 90oC. In this report, the CNT layers are used as the active channel and metal electrodes. In some devices, we use the silver as the electrodes. For the silver electrodes, the nano silver particles are dissolved in the ethylene glycol in the different ratios. In order to avoid the organic solvent damage the underlying layer and suppress the leakage current in the OTFTs, we use a water-based LPD silicon oxide as the gate insulator and passivation layer. This oxide is deposited at 50oC by using the hydrofluosilicic acid (H2SiF2) and water. In this report, the top-contact CNT-OTFTs are completed without using any vacuum process. Before coating the CNT films as the channel layer and electrodes, the CNT solution is filtered and the undissolve CNT powders is removed. After completing the CNT OTFTs., the electrical properties of these devices are measured by the Agilent 4156C in the air. Due to both the CNTs and silicon oxide are air-stable materials, the devices by using new process show the good characteristics