高分子忆阻材料的设计、制备和器件性能研究

通过丰富的结构设计和可控制备调节高分子材料的电学性能，在分子尺度上“定制”忆阻器，对于模拟人类神经突触和神经元的工作方式，提高计算机处理复杂逻辑问题的能力具有重要的意义。固态电化学氧化还原作用以及场致离子迁移与掺杂效应能够有效地调节高分子材料的轨道能级，影响载流子的迁移率并引发材料阻态的可控转变。在本项目中，我们拟创新设计和制备一系列具有电活性基团的高分子功能材料和不同维度的纳米高分子复合材料；研究材料体系的电荷转移与传输、分子间弱相互作用、材料分子结构、聚集态结构、薄膜微结构和电输运特性等因素对材料忆阻效应的调控作用。探索利用不同的前、后突触刺激实现神经突触展现的一些诸如长时/短时塑性、脉冲时间依赖塑性、脉冲频率依赖塑性、和“学习-记忆-遗忘”等基本功能的方法。优化高分子材料结构以及微纳加工工艺，为制作高分子仿生忆阻器原型器件提供参考。

The construction of molecular memristor, which can mimic the working function of human synapses and neurons, is of great importance for enhancing the judging, decision-making and learning capability of modern computer systems. Fine-tuning of the electronic properties of functional polymer materials through the versatile design-cum-synthesis strategy is considered as the key issue to achieve molecular memristors. Solid-state electrochemical redox reaction and electric field-induced ionic migration and doping are effective approaches to modulate the molecular orbital energy levels of electroactive polymer materials. Consequently, the carrier mobility and resistance states of the storage media can be regulated in a controllable manner. In this project, we would like to design and synthesize a series of novel soluble-processable polymer memristive materials, the molecular structure of which can be tailored by functionalizing them with electroactive moieties of different strengths, spacer moieties of different steric effects for the electroactive pendant groups, or nanostructured electroactive materials, and to investigate the modulatory effect of electron transfer and transport, weak intermolecular interactions, molecular stuctures and aggregation-state structures of materials, and the micro-structures of the thin films on the memristive performance of the polymer-based memristors. We also would like to explore the methods that can be used to mimic the fundamental synaptic functions of short-term/long-term plasticity (STP/LTP), spike-timing dependent-plasticity (STDP), spike-rate dependent plasticity (SRDP) and “learning-memory- forget ” experience in a polymer memristive system by using various pre- and postsynaptic spikes. With the optimization of the chemical structure of the functional polymers and the micro/nano-fabrication techniques, we are aiming to demonstrate the prototype implementation of polymer-based memristor devices.