Electrical Switching and Bistability in Organic/Polymeric Thin Films and Memory Devices

TLDR

Metallic nanoparticle‑doped organic/polymeric films exhibit electrical bistability and memory, enabling fast, stackable, high‑density flexible memory devices that rely on charge storage and two conductivity states. This article reviews electrically bistable devices developed in the authors’ laboratory. The review also covers related research conducted by other laboratories. The authors’ work has sparked strong worldwide interest in the field.

Abstract

Abstract Recently, films created by incorporating metallic nanoparticles into organic or polymeric materials have demonstrated electrical bistability, as well as the memory effect, when subjected to an electrical bias. Organic and polymeric digital memory devices based on this bistable electronic behavior have emerged as a viable technology in the field of organic electronics. These devices exhibit fast response speeds and can form multiple‐layer stacking structures, demonstrating that organic memory devices possess a high potential to become flexible, ultrafast, and ultrahigh‐density memory devices. This behavior is believed to be related to charge storage in the organic or polymer film, where devices are able to exhibit two different states of conductivity often separated by several orders of magnitude. By defining the two states as “1” and “0”, it is now possible to create digital memory devices with this technology. This article reviews electrically bistable devices developed in our laboratory. Our research has stimulated strong interest in this area worldwide. The research by other laboratories is reviewed as well.