Department of Materials Science and Engineering , Pohang University of Science and Technology (POSTECH) , Pohang 37673 , Korea.
ACS Appl Mater Interfaces. 2018 Mar 28;10(12):10280-10286. doi: 10.1021/acsami.8b01781. Epub 2018 Mar 14.
Low power consumption is the important requirement in memory devices for saving energy. In particular, improved energy efficiency is essential in implantable electronic devices for operation under a limited power supply. Here, we demonstrate the use of κ-carrageenan (κ-car) as the resistive switching layer to achieve memory that has low power consumption. A carboxymethyl (CM) group is introduced to the κ-car to increase its ionic conductivity. Ag was doped in CM:κ-car to improve the resistive switching properties of the devices. Memory devices based on Ag-doped CM:κ-car showed electroforming-free resistive switching. This device exhibited low reset voltage (∼0.05 V), fast switching speed (50 ns), and high on/off ratio (>10) under low compliance current (10 A). Its power consumption (∼0.35 μW) is much lower than those of the previously reported biomemristors. The resistive switching may be a result of an electrochemical redox process and Ag filament formation in the CM:κ-car under an electric field. This biopolymer memory can also be fabricated on flexible substrate. This study verifies the feasibility of using biopolymers for applications to future implantable and biocompatible nanoelectronics.
低功耗是节省能源的存储设备的重要要求。特别是，在有限电源下运行的植入式电子设备中，提高能量效率是至关重要的。在这里，我们展示了κ-卡拉胶（κ-car）作为电阻开关层的用途，以实现具有低功耗的存储器。在κ-car 中引入羧甲基（CM）基团以提高其离子导电性。在 CM：κ-car 中掺杂 Ag 以改善器件的电阻开关性能。基于掺 Ag 的 CM：κ-car 的存储器件表现出无电成型的电阻开关。该器件在低合规电流（10 A）下表现出低复位电压（约 0.05 V）、快速开关速度（50 ns）和高导通/关断比（>10）。其功耗（约 0.35 μW）远低于先前报道的生物忆阻器。电阻开关可能是由于在电场下 CM：κ-car 中的电化学氧化还原过程和 Ag 细丝形成所致。这种生物聚合物存储器也可以在柔性基板上制造。这项研究验证了使用生物聚合物应用于未来可植入和生物兼容的纳米电子学的可行性。
