Exploiting Schottky Knot in Te-Based Organic–Inorganic Hybrid Perovskite for UV Detector

The typical organic–inorganic hybrid perovskite APbX3 (A = CH3NH3, CH3CH2NH3; X = Cl, Br, I) has attracted wide attention because of its advantages in direct band gap and long-range electron and hole transport length. Although these lead-based hybrid materials have excellent semiconductor properties, toxicity issues have become a great obstacle restricting their wide applications. Therefore, exploring lead-free hybrid perovskites has become an urgent need for high-performance optoelectronic devices. New types of lead-free perovskite hybrids, (dimethylamine)2TeBr6 (1) and (phenethylamine) 4TeBr8 (2), were prepared by a simple solution method. An ultraviolet photodetector based on a bulk lead-free single crystal was fabricated for the first time. The device has a large response current of about 10 nA without an electric field and has more practical applications than devices with smaller response currents. The photocurrent intensity reaches 2000 nA when a voltage of 0.6 V is applied. It can be seen from the performance of the Te devices that lead-free hybrid perovskite single crystal devices are candidates for the prospects of optoelectronic applications.