Flexible and High‐Performance All‐2D Photodetector for Wearable Devices

• Published in: Small (Weinheim an der Bergstrasse, Germany) Germany), 2018-05, Vol.14 (21), p.e1704524-n/a
• Main Authors: Yao, Jiandong, Yang, Guowei
• Format: Article
• Language: English
• Subjects: 2D layered materials; all‐2D photodetectors; Bismuth tellurides; Broadband; Carrier injection; Electrodes; Innovations; Laser deposition; Layered materials; Light; Nanotechnology; Photoelectric effect; Photoelectricity; Photometers; Properties (attributes); pulsed‐laser deposition; Quantum efficiency; Synergistic effect; topological insulators; wearable devices
• ISSN: 1613-6810; 1613-6829
• DOI: 10.1002/smll.201704524

Emerging novel applications at the forefront of innovation horizon raise new requirements including good flexibility and unprecedented properties for the photoelectronic industry. On account of diversity in transport and photoelectric properties, 2D layered materials have proven as competent building blocks toward next‐generation photodetectors. Herein, an all‐2D Bi2Te3‐SnS‐Bi2Te3 photodetector is fabricated with pulsed‐laser deposition. It is sensitive to broadband wavelength from ultraviolet (370 nm) to near‐infrared (808 nm). In addition, it exhibits great durability to bend, with intact photoresponse after 100 bend cycles. Upon 370 nm illumination, it achieves a high responsivity of 115 A W−1, a large external quantum efficiency of 3.9 × 104%, and a superior detectivity of 4.1 × 1011 Jones. They are among the best figures‐of‐merit of state‐of‐the‐art 2D photodetectors. The synergistic effect of SnS's strong light–matter interaction, efficient carrier separation of Bi2Te3–SnS interface, expedite carrier injection across Bi2Te3–SnS interface, and excellent carrier collection of Bi2Te3 topological insulator electrodes accounts for the superior photodetection properties. In summary, this work depicts a facile all‐in‐one fabrication strategy toward a Bi2Te3‐SnS‐Bi2Te3 photodetector. More importantly, it reveals a novel all‐2D concept for construction of flexible, broadband, and high‐performance photoelectronic devices by integrating 2D layered metallic electrodes and 2D layered semiconducting channels. An all‐2D flexible Bi2Te3‐SnS‐Bi2Te3 photodetector is successfully fabricated using a facile pulsed‐laser deposition method. It demonstrates multicolor photoresponse from 370 to 808 nm. Its highest responsivity, external quantum efficiency, and detectivity are 115 A W−1, 3.9 × 104%, and 4.1 × 1011 Jones, rivaling state‐of‐the‐art 2D photodetectors. The finding reveals an all‐2D concept for next generation photoelectronic devices.