Flexible memory and wearable electronics represent an
emerging
technology, thanks to their reliability, compatibility, and superior
performance. Here, an Sb2Te
x
Se3–x
(STSe) phase change material
was grown on flexible mica, which not only exhibited superior nature
in thermal stability for phase change memory application but also
revealed novel function performance in wearable electronics, thanks
to its excellent mechanical reliability and endurance. The thermal
stability of Sb2Te3 was improved obviously with
the crystallization temperature elevated 60 K after Se doping, for
the enhanced charge localization and stronger bonding energy, which
was validated by the Vienna ab initio simulation
package calculations. Based on the ultra-stability of STSe, the STSe-based
phase change memory shows 65 000 reversible phase change ability.
Moreover, the assembled flexible device can show real-time monitoring
and recoverability response in sensing human activities in different
parts of the body, which proves its effective reusability and potential
as wearable electronics. Most importantly, the STSe device presents
remarkable working reliability, reflected by excellent endurance over
100 s and long retention over 100 h. These results paved a novel way
to utilize STSe phase change materials for flexible memory and wearable
electronics with extreme thermal and mechanical stability and brilliant
performance.