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In this study, we report the fabrication and characterization of DNA biopolymer-based rewritable memory devices. Reliable and reproducible resistive switching behaviors are demonstrated with stable switching cycles more than 102 times with low switching voltages. We also observe two different resistive switching behaviors in the reset process and the switching mechanisms are studied and discussed.

We present optically-tunable switching effects based on biopolymer nanocomposite. Without the need of external doping, the nanocomposites can be manipulated by light to exhibit multiple switching behaviors, showing promises for memory device applications.

We present optically tunable operations of deoxyribonucleic acid (DNA) biopolymer devices, where a single high-resistance state, write-once read-many-times memory state, write-read-erase memory state, and single low-resistance state can be achieved by controlling UV irradiation time. The device is a simple sandwich structure with a spin-coated DNA biopolymer layer sandwiched by two electrodes. Upon irradiation, the electrical properties of the device are adjusted owing to a phototriggered synthesis of silver nanoparticles in DNA biopolymer, giving rise to multiple switching scenarios. This technique, distinct from the strategy of doping of pre-formed nanoparticles, enables a post-film fabrication process for achieving optically controlled memory device operations, which provides a more versatile platform to fabricate organic memory and optoelectronic devices.