有機(jī)半導(dǎo)體在溶液中取向生長(zhǎng)機(jī)制及其薄膜的形貌表征
發(fā)布時(shí)間：2019-02-13 14:14
【摘要】：溶液法制備有機(jī)半導(dǎo)體薄膜具有低成本、環(huán)境友好等優(yōu)勢(shì),成為目前有機(jī)薄膜晶體管(Organic thin film transistors,OTFTs)研究領(lǐng)域的熱點(diǎn)。其中,浸漬提拉技術(shù)和噴墨打印技術(shù)由于大面積取向和數(shù)字直寫圖案化制膜的優(yōu)勢(shì)成為OTFT制備工藝開發(fā)的重要基點(diǎn)。本文基于浸漬提拉與噴墨打印技術(shù)制備有源層薄膜,研究有機(jī)半導(dǎo)體分子在溶液中實(shí)現(xiàn)取向生長(zhǎng)的機(jī)制及其薄膜的表征,并進(jìn)一步對(duì)OTFT器件性能進(jìn)行研究,主要內(nèi)容如下:(1)采用浸漬提拉技術(shù)制備大面積取向的6, 13-雙(三異丙基甲硅烷基乙炔基)并五苯(6,13 bis(tri-isopropylsilylethynyl)pentacene,TIPS-并五苯)薄膜,其取向成膜機(jī)制是由溶液內(nèi)部微觀梯度作用產(chǎn)生特定方向的毛細(xì)流控制,這種作用機(jī)制與混合墨水兼容,且薄膜的覆蓋率與溶液粘度成正比。此外,采用傾斜2θ掃描模式來表征TIPS-并五苯晶體的面內(nèi)織構(gòu),較高粘度的氯仿溶液中浸漬提拉制備的TIPS-并五苯薄膜的晶格具有較大的α角和較小的γ角,及其較小的晶格常數(shù)b,該器件表現(xiàn)出高達(dá)1.5cm2V-1s-1的遷移率。(2)通過在襯底構(gòu)建非對(duì)稱的立體結(jié)構(gòu),利用非對(duì)稱立體結(jié)構(gòu)在空間區(qū)域上的表面曲率的變化,在噴墨打印TIPS-并五苯的前驅(qū)體溶液表面形成不對(duì)稱的表面張力作用及表面能梯度,進(jìn)而驅(qū)動(dòng)有機(jī)半導(dǎo)體發(fā)生取向生長(zhǎng)及其自對(duì)準(zhǔn)效果。基于這種非對(duì)稱立體結(jié)構(gòu)制備的OTFT器件的平均遷移率提升40 %,同時(shí)遷移率的相對(duì)標(biāo)準(zhǔn)差由68%減小到39%,表明有機(jī)半導(dǎo)體在微尺度區(qū)域取向生長(zhǎng)的陣列器件的性能及其均勻性都獲得明顯提升。(3)基于 2,7-二辛基-二苯并噻吩(2,7-dioctyl[1]benzothieno[3,2-b][1]Benzothiophene, C8-BTBT) 材料,采用噴墨打印工藝制備 OTFT 的有源層。首先,通過優(yōu)化打印點(diǎn)間距、打印襯底溫度達(dá)到高性能器件的制備(最大遷移率達(dá)到1cm2V-1s-1左右,開關(guān)比超過106),進(jìn)一步分析了該條件下不同修飾襯底噴墨打印單線條薄膜的形貌,發(fā)現(xiàn)在較疏水及低粗糙度的聚(4-乙烯基苯酚)(poly-4-vinyl phenol,PVP)及苯乙基三氯硅烷(phenethyltrichlorosilane,PETS)修飾襯底上得到均勻性好、覆蓋率高且結(jié)晶有序堆積的薄膜形貌及高性能的器件,并研究了PVP襯底的陣列器件的性能均勻性及其穩(wěn)定性,其陣列器件性能表現(xiàn)均勻,且放置時(shí)間超過40天之后仍能保持良好的器件性能(遷移率保持在1 cm2V-1s-1左右)。
[Abstract]:The preparation of organic semiconductor thin films by solution method has the advantages of low cost and environmental friendliness, and has become a hot spot in the field of organic thin film transistors (Organic thin film transistors,OTFTs). Among them, the dipping Czochralski technique and inkjet printing technology have become the important base point for the development of OTFT preparation process due to the advantages of large area orientation and digital direct writing patterning. In this paper, the active layer films were prepared by impregnation Czochralski and inkjet printing techniques. The mechanism of organic semiconductor molecules orientation growth in solution and the characterization of the films were studied, and the properties of OTFT devices were also studied. The main contents are as follows: (1) large area oriented 6,13-bis (triisopropylmethylsilyl acetynyl) pentabenzene (6o 13 bis (tri-isopropylsilylethynyl) pentacene,TIPS- penta-benzene) thin films were prepared by impregnation Czochralski technique. The oriented film-forming mechanism is controlled by the micro-gradient effect of the solution, which is compatible with the mixed ink, and the coverage of the film is proportional to the viscosity of the solution. In addition, the in-plane texture of TIPS- pentaben crystals was characterized by tilting 2 胃 scanning mode. The lattice of TIPS- pentaben films prepared by impregnation and Czochralski in chloroform solution with higher viscosity has larger 偽 angle and smaller 緯 angle. And its smaller lattice constant b, the device exhibits a mobility up to 1.5cm2V-1s-1. (2) by constructing an asymmetric stereoscopic structure on the substrate, the surface curvature of the asymmetric stereoscopic structure changes in the spatial region. Asymmetric surface tension and surface energy gradient were formed on the precursor solution surface of TIPS- pentabenzene, which drives the orientation growth and self-alignment of organic semiconductors. The average mobility of OTFT devices based on this asymmetric stereoscopic structure is increased by 40%, and the relative standard deviation of mobility is reduced from 68% to 39%. It is shown that the properties and homogeneity of organic semiconductor arrays grown in microscale region orientation have been significantly improved. (3) based on 2O7-dioctyl [1] benzothieno [3t2-b] [1] Benzothiophene,. (3) based on 2O7-dioctyl [1] benzothieno [3t2-b] [1] Benzothiophene, C8-BTBT) material, the active layer of OTFT was prepared by inkjet printing process. First of all, by optimizing the printing point spacing, the substrate temperature can be used to fabricate high performance devices (the maximum mobility is about 1cm2V-1s-1 and the switching ratio is more than 106). The morphologies of single-line films on different modified substrates by inkjet printing were further analyzed. It was found that poly (4-vinylphenol) (poly-4-vinyl phenol,PVP) and phenylethyl trichlorosilane (phenethyltrichlorosilane,) were found to be hydrophobic and low roughness in the presence of polyvinyl phenol (poly-4-vinyl phenol,PVP) and phenylethyl trichlorosilane (phenethyltrichlorosilane,). PETS) was used to fabricate the films with good homogeneity, high coverage and ordered crystalline stacking. The homogeneity and stability of the PVP substrate array devices were studied, and the performance of the array devices was uniform. The device performance (mobility is about 1 cm2V-1s-1) can be maintained after the placement time is more than 40 days.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN304.5;TN321.5
本文編號(hào)：2421631
[Abstract]:The preparation of organic semiconductor thin films by solution method has the advantages of low cost and environmental friendliness, and has become a hot spot in the field of organic thin film transistors (Organic thin film transistors,OTFTs). Among them, the dipping Czochralski technique and inkjet printing technology have become the important base point for the development of OTFT preparation process due to the advantages of large area orientation and digital direct writing patterning. In this paper, the active layer films were prepared by impregnation Czochralski and inkjet printing techniques. The mechanism of organic semiconductor molecules orientation growth in solution and the characterization of the films were studied, and the properties of OTFT devices were also studied. The main contents are as follows: (1) large area oriented 6,13-bis (triisopropylmethylsilyl acetynyl) pentabenzene (6o 13 bis (tri-isopropylsilylethynyl) pentacene,TIPS- penta-benzene) thin films were prepared by impregnation Czochralski technique. The oriented film-forming mechanism is controlled by the micro-gradient effect of the solution, which is compatible with the mixed ink, and the coverage of the film is proportional to the viscosity of the solution. In addition, the in-plane texture of TIPS- pentaben crystals was characterized by tilting 2 胃 scanning mode. The lattice of TIPS- pentaben films prepared by impregnation and Czochralski in chloroform solution with higher viscosity has larger 偽 angle and smaller 緯 angle. And its smaller lattice constant b, the device exhibits a mobility up to 1.5cm2V-1s-1. (2) by constructing an asymmetric stereoscopic structure on the substrate, the surface curvature of the asymmetric stereoscopic structure changes in the spatial region. Asymmetric surface tension and surface energy gradient were formed on the precursor solution surface of TIPS- pentabenzene, which drives the orientation growth and self-alignment of organic semiconductors. The average mobility of OTFT devices based on this asymmetric stereoscopic structure is increased by 40%, and the relative standard deviation of mobility is reduced from 68% to 39%. It is shown that the properties and homogeneity of organic semiconductor arrays grown in microscale region orientation have been significantly improved. (3) based on 2O7-dioctyl [1] benzothieno [3t2-b] [1] Benzothiophene,. (3) based on 2O7-dioctyl [1] benzothieno [3t2-b] [1] Benzothiophene, C8-BTBT) material, the active layer of OTFT was prepared by inkjet printing process. First of all, by optimizing the printing point spacing, the substrate temperature can be used to fabricate high performance devices (the maximum mobility is about 1cm2V-1s-1 and the switching ratio is more than 106). The morphologies of single-line films on different modified substrates by inkjet printing were further analyzed. It was found that poly (4-vinylphenol) (poly-4-vinyl phenol,PVP) and phenylethyl trichlorosilane (phenethyltrichlorosilane,) were found to be hydrophobic and low roughness in the presence of polyvinyl phenol (poly-4-vinyl phenol,PVP) and phenylethyl trichlorosilane (phenethyltrichlorosilane,). PETS) was used to fabricate the films with good homogeneity, high coverage and ordered crystalline stacking. The homogeneity and stability of the PVP substrate array devices were studied, and the performance of the array devices was uniform. The device performance (mobility is about 1 cm2V-1s-1) can be maintained after the placement time is more than 40 days.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN304.5;TN321.5
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相關(guān)期刊論文 前1條
1 趙鵬;;拉曼光譜的原理[J];時(shí)代教育(教育教學(xué));2011年09期
相關(guān)碩士學(xué)位論文 前1條
1 元淼;基于噴墨打印工藝的小分子有機(jī)薄膜晶體管的制備和性能研究[D];合肥工業(yè)大學(xué);2015年
，本文編號(hào)：2421631
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