Enhanced stability of guanidinium-based organic-inorganic hybrid lead triiodides in resistance switching

We describe guanidinium-based organic-inorganic hybrid lead triiodides (GAPbI3) as an active layer in resistive switching structures and compare the switching results to those of the conventional compound, MAPbI3. Both the GAPbI3- and MAPbI3-based ReRAM devices showed bistable switching characteristics with a low operating voltage (<0.25 V) and high on/off ratio (∼106). Remarkably, we found that the GAPbI3-based devices exhibited prolonged switching behaviors for over 40 days under ambient conditions (MAPbI3, only 4 days). The GAPbI3 devices lasted for a larger number of cycles (>1900) in an endurance test and exhibited a longer data storage time (>3 × 104 s) in a retention test. Our results suggest that GAPbI3 has stronger hydrogen bonding in the lattice and thus the potential for application in memory devices.