Flexible Multistate Data Storage Devices Fabricated Using Natural Lignin at Room Temperature

• DOI: 10.1021/acsami.6b14566
• Publication Date: 2017-01-12T12:08:04Z
• Authors: Youngjun Park; Jang-Sik Lee
• Keywords: CHALLENGES; GREEN ELECTRONICS; lignin; 02 engineering and technology; NONVOLATILE MEMORY; flexible electronics; 7. Clean energy; RESISTIVE SWITCHING MEMORIES; MECHANISMS; 12. Responsible consumption; THIN-FILMS; NANOCRYSTALS; biomemristors; AMORPHOUS-CARBON; resistive switching memory; multilevel data storage; FUNCTIONAL MATERIALS; 0210 nano-technology; BEHAVIOR

The growing interest in bioinspired and sustainable electronics has induced research on biocompatible and biodegradable materials. However, conventional electronic devices have been restricted due to their nonbiodegradable and sometimes harmful and toxic materials, which can even cause environmental issues. Here, we report a resistive switching random access memory (ReRAM) device based on lignin, which is a biodegradable waste product of the paper industry. The active layer of the device can be easily formed using a simple solution process on a plastic substrate. The memory devices show stable bipolar resistive switching behavior with good endurance and retention. Appropriate control of the maximum reset voltage and compliance current can yield multibit data storage capability with at least four resistance states, which can be exploited to realize a high-density memory device. The resistive switching mechanism may be a result of formation and rupture of carbon-rich filaments. These results suggest that lignin is a promising candidate material for an inexpensive and environmentally benign ReRAM device. We believe that this study can initiate a new route toward development of biocompatible and flexible electronics.