Flexible SnO Optoelectronic Memory Based on Light-Dependent Ionic Migration in Ruddlesden–Popper Perovskite

作者：Qianlei Tian, Ruohao Hong, Chang Liu, Xitong Hong, Sen Zhang, Liming Wang, Yawei Lv, Xingqiang Liu, Xuming Zou, Lei Liao · 发表于：Nano Letters · 年份：2021 · DOI：10.1021/acs.nanolett.1c04402 · 被引用次数：25 · 研究领域：Perovskite Materials and Applications、Conducting polymers and applications、Advanced Memory and Neural Computing

Nonvolatile optoelectronic memories based on organic–inorganic hybrid perovskites have appeared as powerful candidates for next-generation soft electronics. Here, ambipolar SnO transistor-based nonvolatile memories with multibit memory behavior (11 storage states, 120 nC state –1 ) and ultralong retention time (>10 5 s) are demonstrated for which an Al 2 O 3 /two-dimensional Ruddlesden–Popper perovskite (2D PVK) heterostructure dielectric architecture is employed. The unique storage features are attributed to suppressed gate leakage by Al 2 O 3 layer and hopping-like ionic transport in 2D PVK with varying activation energy under different light intensities. The photoinduced field-effect mechanism enables top-gated transistor operation under illumination, which would not be achieved under dark. As a result, the device exhibits remarkable photoresponsive characteristics, including ultrahigh specific detectivity (2.7 × 10 15 Jones) and broadband spectrum distinction capacity (375–1064 nm). This study offers valuable insight on the PVK-based dielectric engineering for information storage and paves the way toward multilevel broadband-response optoelectronic memories.