基于液态金属/高分子复合电极的柔性阻变存储器研究

As a new generation of information storage technology, flexibility of resistive random access memory (RRAM) will help advance the wearable electronic technology for growth. Flexible electrode is a key component of flexible RRAM. But the current flexible electrodes are all based on solid conductive fillers. There are often unideal mechanical property and conductive performance. It is very difficult to meet the request of flexible RRAM. In this project, we will take the key research on the flexible electrodes based on liquid metal conductive fillers. Conductive performance and mechanical property can be improved utilizing their peculiar high conductivity and deformation capacity. We mainly research the regulatory effects of some factors including doping ratio, dispersion degree, morphology and particle size of liquid metal on electroconductivity, elasticity and mechanical stability of liquid metal/polymers composite electrode. The aim of the project is to find out their relating law of storage performances with the electroconductivity, elasticity and mechanical stability under stress, finally get a flexible electrode with low resistivity and high mechanical stability and a prototype RRAM with good storage stability and mechanical stability, and provide academic supports and valuable materials for the development of flexible storage technology.

作为一种新兴的存储技术，阻变存储器（RRAM）的柔性化有利于推动可穿戴电子技术的发展。弹性电极是柔性RRAM的重要组成部分，但当前的弹性电极都是固态导电材料/高分子复合电极，往往存在导电性差和力学性能不稳定的问题，难以满足柔性RRAM的应用要求。本项目拟以液态金属/高分子复合电极作为研究重点，利用液态金属高电导率和可变形的特点，提高电极的导电性和力学稳定性。主要研究液态金属导电填料的掺杂比例、分散程度、形状和粒径等因素对液态金属/高分子复合电极导电性、弹性和力学稳定性的调控作用，以及应力/应变作用下液态金属/高分子复合电极的导电性、弹性和力学稳定性与柔性阻变存储器稳定性的关联规律。最终获得具有低的电阻率和良好力学稳定性的液态金属/高分子复合电极，以及良好存储稳定性和力学稳定性的柔性阻变存储原型器件，为发展柔性存储技术提供理论和材料基础。

作为一种新兴的存储技术，阻变存储器（RRAM）的柔性化有利于推动可穿戴电子技术的发展。弹性电极是柔性RRAM的重要组成部分，但当前的弹性电极都是固态导电材料@高分子复合电极，往往存在导电性差和力学性能不稳定的问题，难以满足柔性RRAM的应用要求。针对上述问题，本项目以液态金属@高分子复合电极作为研究重点，利用液态金属高电导率和可变形的特点，提高电极的导电性和力学稳定性。主要研究了液态金属导电填料的物相控制方法，以及导电性、弹性和力学稳定性俱佳的液态金属@高分子复合电极的制备方法；研究了复合电极的导电性、弹性和力学稳定性与柔性阻变存储器稳定性的关联规律，及其内在的物理机制。最后，获得的液态金属@PDMS复合电极的体积电阻率仅为7.5×10-4Ω·cm，且拉伸100%时电阻的波动也仅为4.305%。更为重要的是，基于该复合电极的柔性RRAM器件在应力/应变作用下具有稳定的存储性能，这为柔性存储技术的发展提供理论和材料基础。