基于MEH-PPV薄膜的有机电双稳器件

发布时间：2018-03-22 08:38

本文选题：有机电双稳器件　切入点：旋涂法　出处：《北京交通大学》2017年硕士论文　论文类型：学位论文

【摘要】：为了满足下一代光电器件的需求,人们开始了对于新型存储器的广泛研究。基于有机/聚合物材料制备的电双稳器件因其制备工艺简单,成本低,尺寸小,存储密度高等优点受到了越来越多的关注。本工作基于成熟的商业化聚合物材料MEH-PPV,分别结合了聚合物PEG(聚乙二醇)和有机小分子Alq3,采用旋涂的方法制备有机电双稳器件,并对器件的电学性能进行了测试,同时对影响器件电双稳特性的因素和器件的工作机理开展了一系列的探讨与研究。主要工作内容如下:(1)PEG作为一种成熟的商业化介电聚合物材料,因其价格低廉,性能稳定,绿色溶剂等优点,被用于各种新型光电子器件的研究与生产中。本研究将PEG与具有优良半导体特性的MEH-PPV相结合,通过旋涂的方式制备了功能层为PEG与MEH-PPV的全聚合物电双稳器件:A1/MEH-PPV/PEG/ITO。研究了 PEG的分子量,浓度,以及其退火温度对器件性能的影响,在此研究基础上对器件进行了优化,器件的电流开关比可以达到103。此外,通过SEM测试表征了活性层的膜形貌,并结合器件性能研究了膜形貌与器件性能的关联因素。同时,通过对器件的I-V曲线进行了线性拟合,拟合的结果表明,MEH-PPV/PEG器件电双稳特性的产生主要归因于活性层界面处的电荷俘获。(2)Alq3作为一种成熟的商业化有机小分子材料,在有机OLED中已经被广泛应用,近些年来,Alq3开始被引入到有机存储器的研究,在以往的研究中,Alq3活性层都是利用传统的蒸镀方式,这大大的增加了制备成本,限制了器件的应用前景。本研究首次采用全溶液旋涂方法,制备了活性层为MEH-PPV/Alq3的有机电双稳器件。器件的I-V测试结果表明,单层的MEH-PPV或者单层的Alq3器件都不具有电双稳特性,而基于MEH-PPV/Alq3活性层的器件展现了很好的电双稳特性,其最大开关比达到104。结合有机电子学理论模型与器件I-V曲线拟合,研究了器件的可能工作机理。最后,对器件进行了循环脉冲和持续时间的测试,得出器件具有良好的读写擦除能力,并且在空气中具有稳定的高低态保持有能力。
[Abstract]:In order to meet the needs of the next generation of optoelectronic devices, people have begun to study the new type of memory widely. Because of its simple fabrication process, low cost and small size, the electric bistable devices based on organic / polymer materials have been fabricated. More and more attention has been paid to the advantages of high storage density. Based on the mature commercial polymer MEH-PPVs, PEG (Poly (ethylene glycol)) and Alq3 (organic small molecule) were used to fabricate electromechanical bistable devices by spin coating. The electrical properties of the device are also tested. At the same time, a series of discussions and studies have been carried out on the factors affecting the electrical bistability of the devices and the working mechanism of the devices. The main contents of the work are as follows: (1) as a mature commercial dielectric polymer material, because of its low price and stable performance, Green solvent has been used in the research and production of various new optoelectronic devices. In this study, PEG is combined with MEH-PPV with excellent semiconductor properties. An all-polymer bistable device with a functional layer of PEG and MEH-PPV was fabricated by spin-coating. The effects of molecular weight, concentration and annealing temperature of PEG on the properties of the device were investigated, and the effects of the molecular weight, concentration and annealing temperature of PEG on the performance of the device were studied. The current-to-switch ratio of the device can reach 103. In addition, the film morphology of the active layer is characterized by SEM, and the correlation factors between the film morphology and the device performance are studied. At the same time, the I-V curve of the device is fitted linearly. The fitting results show that the electrical bistability of MEH-PPV-PEG devices is mainly due to the charge trapping at the active layer interface. As a mature and commercial organic small molecule material, it has been widely used in organic OLED. In recent years, Alq3 has been introduced into the study of organic memory. In the previous studies, the active layer of Alq3 was deposited by traditional evaporation, which greatly increased the cost of preparation. In this study, organic bistable devices with active layer of MEH-PPV/Alq3 have been prepared for the first time. The I-V test results show that neither monolayer MEH-PPV nor monolayer Alq3 devices have the characteristics of electrical bistability. The device based on the active layer of MEH-PPV/Alq3 exhibits good bistability and its maximum switching ratio reaches 104. The possible working mechanism of the device is studied by combining the theoretical model of organic electronics with the I-V curve fitting of the device. The cycle pulse and duration of the device are tested. It is concluded that the device has good literacy erasure ability and stable high and low state in the air.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN15;TB383.2

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