绝缘层及极性杂质对TIPS-pentacene单晶电子迁移性能的影响
发布时间：2018-11-15 17:35
【摘要】：有机场效应晶体管以其价廉、质轻、可大规模加工应用等优点引起了人们的广泛关注。相较于研究较多的无定型或多晶薄膜,有机单晶由于其较高的有序性以及较低的缺陷密度等优点,更有利于研究半导体中电荷的本征传输性能。在近几年的研究中,人们发现,绝缘层材料的选择对晶体管的性能也起着至关重要的作用。而在绝缘层的研究中,主要针对其对p型器件的影响为主,而对于电子传输性能方面的影响研究较少。近期,我们发现使用非极性溶剂在 BCB(divinyl-tetramethyldisiloxane-bis(benzocyclobutene))上生长 TIPS-pentacene(6,13-bis(triisopropyl-silylethynyl)pentacene)这一典型的 p 型有机半导体,并使用金作为源漏电极时,TIPS-pentacene在显示较高空穴传输性能的同时,还显现出明显的电子传输性能。这一电子性质是之前没有发现过的,原因很可能是晶体中的极性溶剂分子残留阻碍了电子的传输。对此,论文以TIPS-pentacene为研究对象,进一步展开对其电子传输性质的研究,探索了绝缘层以及极性溶剂残留对TIPS-pentacene单晶电子迁移性能的影响。论文第一章概述了有机单晶的制备方法、有机场效应晶体管的构筑方法和应用、聚合物绝缘层影响器件的因素。论文第二章具体研究了绝缘层以及极性溶剂残留这两种可极化环境对TIPS-pentacene单晶电子迁移性能的影响。并在聚苯乙烯、聚甲基丙烯酸甲酯、聚甲基丙烯酸甲酯和聚(偏氟乙烯-三氟乙烯-氯氟乙烯)三嵌段共聚物双层绝缘层以及聚乙烯醇这4种绝缘层上获得了 TIPS-pentacene单晶的电子迁移性能。并在聚甲基丙烯酸甲酯绝缘层上,获得了 TIPS-pentacene 最高 0.48 cm2V-1s1 的电子迁移率。通过对比发现,随着绝缘层介电常数的增加,电子迁移率随之降低。随后我们又研究了极性溶剂残留对TIPS-pentacene单晶电子迁移性能的影响,发现极性溶剂(包括氯仿、二氯甲烷、1,2-二氯乙烷以及四氢呋喃)的残留会削弱电子传输性能。论文第三章具体研究了绝缘层表面经基对TIPS-pentacene单晶电子迁移性能的影响。通过研究发现,绝缘层表面的醇羟基由于具有较高的解离常数(解离常数pKa～15),较难解离氢离子,对电子的捕获能力较弱,在其表面依然可以获得TIPS-pentacene单晶较高的电子传输性能。同时我们也发现绝缘层表面的醇羟基密度对电子迁移性能的影响并不十分显著。但对于绝缘层表面的酚羟基而言,由于其相对容易解离出氢离子而捕获电子,因此在其表面,我们没有获得TIPS-pentacene单晶的电子传输性能。
[Abstract]:Due to its advantages of low price, light weight, large scale processing and so on, the field effect transistor has attracted much attention. Compared with amorphous or polycrystalline films, organic single crystals are more suitable for studying the intrinsic transport properties of charge in semiconductors due to their high order and low defect density. In recent years, it has been found that the selection of insulating material plays an important role in the performance of transistors. In the research of insulation layer, the influence of the insulator on the p-type device is mainly focused on, but the influence on the electronic transmission performance is less. Recently, we have found that when we use non-polar solvent to grow the TIPS-pentacene (6C13-bis (triisopropyl-silylethynyl) pentacene), a typical p-type organic semiconductor, and use gold as the source and leakage electrode, we find that the TIPS-pentacene (6C13 bis) is a typical organic semiconductor on BCB (divinyl-tetramethyldisiloxane-bis (benzocyclobutene), and gold is used as the source and leakage electrode. TIPS-pentacene not only shows high hole transport performance, but also shows obvious electron transport performance. This electron property has not been found before, probably because the polar solvent molecule residues in the crystal hinder the electron transport. In this paper, the electron transport properties of TIPS-pentacene were studied, and the effects of insulating layer and polar solvent residues on the electron transport properties of TIPS-pentacene single crystal were investigated. In the first chapter, the preparation methods of organic single crystals, the construction methods and applications of field effect transistors and the influence factors of polymer insulating layer on the devices are summarized. In chapter 2, the effects of the insulator and the polar solvent residue on the electron migration of TIPS-pentacene single crystal are studied in detail. And in polystyrene, polymethyl methacrylate, The electron migration properties of TIPS-pentacene single crystals were obtained on polymethyl methacrylate and poly (vinylidene fluoride trifluoroethylene chlorofluoroethylene) triblock copolymer double insulating layer and polyvinyl alcohol. The maximum electron mobility of TIPS-pentacene at 0.48 cm2V-1s1 was obtained on the polymethyl methacrylate insulator. It is found that the electron mobility decreases with the increase of dielectric constant. Then we studied the effect of polar solvent residues on the electron transport properties of TIPS-pentacene single crystals. It was found that the residues of polar solvents (including chloroform, dichloromethane, 1o 2-dichloroethane and tetrahydrofuran) would weaken the electron transport performance. In chapter 3, the effect of the surface of insulating layer on the electron migration of TIPS-pentacene single crystal is studied. It is found that the hydroxyl alcohol on the surface of the insulating layer is difficult to dissociate hydrogen ions because of its high dissociation constant (pKa~15). High electron transport properties of TIPS-pentacene single crystal can still be obtained on its surface. At the same time, we found that the influence of alcohol hydroxyl density on the electron transport performance was not significant. However, for the phenolic hydroxyl groups on the insulating surface, the electron transport properties of TIPS-pentacene single crystals are not obtained because of their relatively easy dissociation of hydrogen ions to capture electrons.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN386
本文编号：2333983
[Abstract]:Due to its advantages of low price, light weight, large scale processing and so on, the field effect transistor has attracted much attention. Compared with amorphous or polycrystalline films, organic single crystals are more suitable for studying the intrinsic transport properties of charge in semiconductors due to their high order and low defect density. In recent years, it has been found that the selection of insulating material plays an important role in the performance of transistors. In the research of insulation layer, the influence of the insulator on the p-type device is mainly focused on, but the influence on the electronic transmission performance is less. Recently, we have found that when we use non-polar solvent to grow the TIPS-pentacene (6C13-bis (triisopropyl-silylethynyl) pentacene), a typical p-type organic semiconductor, and use gold as the source and leakage electrode, we find that the TIPS-pentacene (6C13 bis) is a typical organic semiconductor on BCB (divinyl-tetramethyldisiloxane-bis (benzocyclobutene), and gold is used as the source and leakage electrode. TIPS-pentacene not only shows high hole transport performance, but also shows obvious electron transport performance. This electron property has not been found before, probably because the polar solvent molecule residues in the crystal hinder the electron transport. In this paper, the electron transport properties of TIPS-pentacene were studied, and the effects of insulating layer and polar solvent residues on the electron transport properties of TIPS-pentacene single crystal were investigated. In the first chapter, the preparation methods of organic single crystals, the construction methods and applications of field effect transistors and the influence factors of polymer insulating layer on the devices are summarized. In chapter 2, the effects of the insulator and the polar solvent residue on the electron migration of TIPS-pentacene single crystal are studied in detail. And in polystyrene, polymethyl methacrylate, The electron migration properties of TIPS-pentacene single crystals were obtained on polymethyl methacrylate and poly (vinylidene fluoride trifluoroethylene chlorofluoroethylene) triblock copolymer double insulating layer and polyvinyl alcohol. The maximum electron mobility of TIPS-pentacene at 0.48 cm2V-1s1 was obtained on the polymethyl methacrylate insulator. It is found that the electron mobility decreases with the increase of dielectric constant. Then we studied the effect of polar solvent residues on the electron transport properties of TIPS-pentacene single crystals. It was found that the residues of polar solvents (including chloroform, dichloromethane, 1o 2-dichloroethane and tetrahydrofuran) would weaken the electron transport performance. In chapter 3, the effect of the surface of insulating layer on the electron migration of TIPS-pentacene single crystal is studied. It is found that the hydroxyl alcohol on the surface of the insulating layer is difficult to dissociate hydrogen ions because of its high dissociation constant (pKa~15). High electron transport properties of TIPS-pentacene single crystal can still be obtained on its surface. At the same time, we found that the influence of alcohol hydroxyl density on the electron transport performance was not significant. However, for the phenolic hydroxyl groups on the insulating surface, the electron transport properties of TIPS-pentacene single crystals are not obtained because of their relatively easy dissociation of hydrogen ions to capture electrons.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN386
【参考文献】
相关期刊论文 前1条
1 刘爽;吴嘉柯;范聪成;薛国标;陈红征;Huolin L.Xin;李寒莹;;面向场效应晶体管大规模制备的有机单晶溶液生长（英文）[J];Science Bulletin;2015年12期
，本文编号：2333983
本文链接：https://www.wllwen.com/kejilunwen/dianzigongchenglunwen/2333983.html
