柔性有机铁电薄膜的自极化机理研究

项目名称： 柔性有机铁电薄膜的自极化机理研究

项目编号： No.61474131

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 无线电电子学、电信技术

项目作者： 沈宏

作者单位： 中国科学院上海技术物理研究所

项目金额： 76万元

中文摘要： 非制冷单片集成式铁电红外焦平面探测器中，器件极化是一个关键步骤。有机铁电薄膜红外探测器具有柔性轻量化的特征，极大拓展了其应用领域，然而在柔性衬底上进行极化仍存在诸多问题，限制了其发展。自极化现象提供了新的可能，但其物理起源尚不清楚，同时自极化率亦较低，无法达到均匀完全极化,不能满足实用要求。本项目拟通过多种成膜方式在柔性衬底上制备自极化有机铁电薄膜，从薄膜材料晶化机理、电极材料与铁电畴在界面的相互作用、空间电荷对极化稳定性的影响等方面，探索铁电自极化的发生条件,研究各种成膜方式下铁电畴生成与取向的差异，深入理解有机铁电体自极化的物理机制，形成创新而有效的自极化有机铁电薄膜制备方法。依托现有各种探测分析设备对原型器件进行评价，形成完备的以自极化工艺为主要特征的柔性有机铁电薄膜器件制备、测试、分析系统，为柔性有机铁电红外焦平面的研究提供关键技术，推动其在国防军工、智能家居、物联网等领域的应用。

中文关键词： 有机铁电体；柔性衬底；光电器件；红外探测；传感器

英文摘要： Material polarization is a key step in the fabrication of uncooled ferroelectric infrared focal plane arrays. Organic ferroelectric thin films, with flexible and lightweight features, can greatly expand infrared detectors' application area. However, there are still many problems in the polarization process on flexible substrate, which limit its development. Self-polarization phenomena may offer novel solutions, so far, the physical origin remains uncertain. The low self-polarization ratio and the uniformity are unable to meet practical requirements. This project intends to prepare self-polarized organic ferroelectric thin films on flexible substrates by a variety of techniques, exploring the self-polarization conditions in different film-forming procedure, researching the domains generation and orientation differences, understanding the physical mechanism of the self-polarization in-depth. Thus we could find out an innovative self-polarized film preparation method and connect the polarization ratio with the film processing parameters. Furthermore, relying on the analysis equipment of detection performance, the prototype devices could be evaluated. A comprehensive system could be set up, including self-polarized ferroelectric polymer film detector's preparation, testing and analysis system. These results will provide key technology needed in the development of infrared focal plane detectors. Through this project, the self-polarization mechanism and process conditions of ferroelectric polymer films could be achieved, which could promote future applications in various fields.

英文关键词： organic ferroelectrics;flexible substrate;optoelectronic devices;infrared detection;sensor