  The increasing use of portable and wireless technologies has led to a growing
focus on radio-frequency identification (RFID) tags. Among the various devices
in RFID tags, rectifying diodes are the most demanding in terms of
high-frequency performance, and these diodes are dominated by organic
materials. However, their intrinsic low carrier mobility largely limits the
rectifying ability of organic diodes. As an alternative, metal halide
perovskites (MHPs) possess high carrier mobility, making them potential
candidates for higher-frequency applications. Whereas their ion-migration issue
may deteriorate their high-frequency performance. In this study, we report
rectifying diodes based on MHPs that can rectify an incoming sinusoidal signal
at 13.56 MHz. The diodes exhibit a high rectification ratio of 1.9 x 103 at 1 V
and can rectify signals at even higher frequencies. We designed a triangular
wave detection method to measure the intensity of ion-migration at different
frequencies. Interestingly, the ion-migration did not occur at such a high
frequency. The high-frequency stagnant ions and excellent carrier mobility make
MHPs unexpectedly suitable for high-frequency applications, providing a
promising solution to ion-migration issues and paving the way for perovskites
in high-frequency areas.
