The realization of healthcare products that can be wearable, attachable, and implantable to human body based on electronic and optical devices has become a paradigm of the new era. Furthermore, the real-time utilization and therapy through biometric information will create great worth by combining with information technology and enrich our daily life in the near future. However, conventional healthcare electronics are commonly fabricated by using inorganic materials, so that it is not easily applicable to flexible electronics because of many problems such as mechanical instability, fragility, and high fabrication costs. In this regard, studies related to flexible electronics using organic materials such as small molecules, polymers, and metal-doped composites have been steadily emerging. However, conventional polymeric organic materials involve complex chemical synthesis and processing, which consume a lot of energy and produce toxic byproducts that cause environmental pollution. For these reasons, biologically reliable biomaterials are attracting a lot of attention due to many advantages such as high flexibility, simple processability, non-toxic characteristic, and biodegradability.
In this study, we successfully fabricated resistive random access memory (RRAM) which is key component of data storage system, and analyzed nonvolatile switching behavior by utilizing a novel natural biomaterial, glucose, as a switching layer of RRAM without additional purification or extraction. We could confirm that solution processed glucose-based RRAM devices showed reasonable switching performance with ~103 memory window, 100 cycles endurance, and 104 seconds data retention. In addition, we were able to evaluate switching characteristics of the RRAM devices fabricated on PI film as being attached to a transparent vial to realize flexible and wearable applications. Finally, we demonstrated the possibility for the completely transient memory devices that are consisted of cross-bar array structure on glass and rice paper substrate with Mg electrode. The goal of this research is to provide the paths and insights for the production of biologically benign and environmentally friendly storage applications, as well as biocompatible electronic systems to fulfil the future demand.