Self-Powered Ferroelectric Film-Based Ultraviolet Photodetector with Strong Thermoelectric Effect for Wearable Medical Application

Ferroelectric thin film-based self-powered photodetectors (PDs) have sparked huge interest due to the mechanism of depolarization fields derived from spontaneous polarization. Many existing photodetectors were made on rigid substrates. The brittleness property restricts its use to curved surfaces, such as a human body. Although there are lot of works on the sol-gel method of synthesis of BTO. Herein, ultrathin <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">BaTiO</sup>3 (BTO) outer layers are produced on the surface of a TiO2 nanolayer via a hydrothermal process, and a self-sustaining TiO<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf>-BTO PD is created. The photodetector used here can sense the surrounding temperature and change its response according to it. As observed from the current vs time graph the current is enhanced from 12nA to 160nA as the temperature varied from 40°C to 80°C respectively. The responsivity was observed to be enhanced from 0.18 A/W to 2.7 A/W as temperature varies from 40 °C to 80°C respectively. The capacity to transform light impulses into electrical impulses for self-powered PDs in real time reveals its significant importance in optoelectronic interconnection circuits, with substantial application possibilities in optical communication.