Transparent,
Flexible, Fatigue-Free, Optical-Read,
and Nonvolatile Ferroelectric Memories
Posted on 2019-09-13 - 16:36
Perovskite oxide
films are widely used in various commercial industries.
However, they are usually prepared at high temperature and in oxygen
ambience, detrimental to most transparent and flexible substrates
and bottom conductive electrodes such as indium tin oxide (ITO). It
remains challenging to integrate perovskite oxides into transparent
and flexible electronics. Here, the 1.2 wt % Ag-doped ITO (Ag-ITO)
grown on a mica substrate is employed as the bottom electrode, which
can withstand high temperature and repeated bending, and then we achieve
the transparent, flexible, fatigue-free, and optical-read ferroelectric
nonvolatile memories based on the mica/Ag-ITO/Bi3.25La0.75Ti3O12/ITO structures. The as-prepared
memories show ∼80% transmittance for visible lights and fatigue-free
performance after more than 108 writing/erasing cycles.
These performances are stable after repeated bending down to 3 mm
in a curvature radius. More importantly, the “1/0” state
of the memory can be read out by the photovoltaic current rather than
destructive polarization switching, an emergent functionality for
many applications. This work substantially promotes the applications
of perovskite oxide films in transparent and flexible electronics,
including wearable devices.
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