Multifunctional Electronic Skin Based on Perovskite Intermediate Gels

Abstract Electronic skin (e‐skin) has attracted extensive attention owing to its potential application in biomedical sensors, intelligent robots, and bionic prostheses. To imitate better or even surmount the perceptive capabilities of human skin, multifunctional e‐skin is an important trend in the field. A novel stable perovskite intermediate gel (PIGel) is obtained during the MA 2 SnI 6 perovskite crystallization process. This Sn‐based PIGel exhibits good conductivity and outstanding wettability on different polymer substrates. Based on these properties, it is successfully applied to the field of e‐skin. Flexible and stretchable multifunctional e‐skin sensors are developed based on it. Stretching, finger bending, voice recognition, pulse monitoring, temperature, and electricity response are achieved in one e‐skin device. In addition, the MA 2 SnI 6 perovskite single crystal is prepared by solvent engineering. The formation mechanism of the PIGel and MA 2 SnI 6 single crystal is studied in detail. This work broadens the selection range of sensing materials for e‐skin and paves the way to achieve multifunctional sensors with the facile fabrication process.