New Material Detects Light Across Visible Spectrum, Raising Sensor Prospects
Researchers have engineered a photodetector using a two-dimensional material that responds to light wavelengths spanning the entire visible spectrum—from ultraviolet through red. The device maintained stable performance through 15,000 cycles, suggesting potential applications in imaging sensors, optical communications, and autonomous systems where broad-spectrum light detection is required.
Originaltitel: Broad-Band Photoelectrochemical Photodetector Based on Ternary Sb<sub>2</sub>Te<sub>2</sub>Se Nanosheets
<p>As a novel V-VI ternary topological insulator, Sb<sub>2</sub>Te<sub>2</sub>Se, has recently garnered great attention that has motivated both theoretical and experimental investigations. Numerous simulations have proved that 2D ternary Sb<sub>2</sub>Te<sub>2</sub>Se is a promising candidate for various optoelectronic devices. However, there are only a few experimental reports focusing on 2D Sb<sub>2</sub>Te<sub>2</sub>Se-based devices due to the lack of a facile synthetic approach. Herein, few-layered 2D Sb<sub>2</sub>Te<sub>2</sub>Se nanosheets are prepared by efficient liquid phase exfoliation and their photoresponse performance is systematically investigated using a photoelectrochemical type photodetector. As revealed, the 2D Sb<sub>2</sub>Te<sub>2</sub>Se-based photodetector exhibits a significant photoresponse in alkaline electrolytes with excellent long-term cycling stability (decrement of 3.3% during 15000 cycles). In addition, a wide spectral response ranging from 365 to 700 nm could be achieved, indicating great potential for broad-band photodetection. With this initial exploration work, it is anticipated that 2D ternary Sb<sub>2</sub>Te<sub>2</sub>Se materials can be developed for future optoelectronic devices with high performance.</p>