Pyroelectricity Induced by Schottky Interface above the Curie Temperature of Bulk Materials

Pyroelectricity is a characteristic property of materials that converts temperature fluctuations into electric signals. Ferroelectric materials, such as BaTiO3, are frequently applied in pyroelectric devices. However, the depolarization of the material above the Curie temperature (Tc) restricts the pyroelectric response of existing ferroelectric-based devices. Here, we propose an alternative approach where the pyroelectric response relates to the built-in electric field generated at a Schottky interface. The indium tin oxide/BaTiO3/La- NiO3 film with a Schottky interface exhibits good pyroelectric performance when the operating temperature is r,20 degrees C higher than the Tc (125 degrees C) of bulk BaTiO3. The film exhibits a pyroelectric current density of 0.537 mA/cm2 and a high cyclic stability at 150 degrees C. The pyroelectric film can operate as a self -powered temperature sensor above the Tc of bulk BaTiO3, with a response time of 30 ms. This study provides a new strategy to enhance the pyroelectric properties and reliability of ferroelectric-based devices.