Chemical Vapor Deposition Growth of High Crystallinity Sb2Se3 Nanowire with Strong Anisotropy for Near‐Infrared Photodetectors

• Published in: Small (Weinheim an der Bergstrasse, Germany) Germany), 2019-03, Vol.15 (9), p.n/a
• Main Authors: Ma, Zongpeng, Chai, Shouning, Feng, Qingliang, Li, Liang, Li, Xiaobo, Huang, Lingli, Liu, Dongyan, Sun, Jie, Jiang, Ruibin, Zhai, Tianyou, Xu, Hua
• Format: Article
• Language: English
• Subjects: Anisotropy; Antimony compounds; antimony triselenide (Sb2Se3); Aspect ratio; Chemical vapor deposition; Crystal structure; Crystallinity; CVD growth; Mica; Morphology; Nanotechnology; nanowire; Nanowires; Optoelectronic devices; Organic chemistry; photodetector; Photoelectric effect; Photoelectric emission; Photometers; Raman spectroscopy; Selenides; Substrates
• ISSN: 1613-6810; 1613-6829
• DOI: 10.1002/smll.201805307

Low‐dimensional semiconductors have attracted considerable attention due to their unique structures and remarkable properties, which makes them promising materials for a wide range of applications related to electronics and optoelectronics. Herein, the preparation of 1D Sb2Se3 nanowires (NWs) with high crystal quality via chemical vapor deposition growth is reported. The obtained Sb2Se3 NWs have triangular prism morphology with aspect ratio range from 2 to 200, and three primary lattice orientations can be achieved on the sixfold symmetry mica substrate. Angle‐resolved polarized Raman spectroscopy measurement reveals strong anisotropic properties of the Sb2Se3 NWs, which is also developed to identify its crystal orientation. Furthermore, photodetectors based on Sb2Se3 NW exhibit a wide spectral photoresponse range from visible to NIR (400–900 nm). Owing to the high crystallinity of Sb2Se3 NW, the photodetector acquires a photocurrent on/off ratio of about 405, a responsivity of 5100 mA W−1, and fast rise and fall times of about 32 and 5 ms, respectively. Additionally, owing to the anisotropic structure of Sb2Se3 NW, the device exhibits polarization‐dependent photoresponse. The high crystallinity and superior anisotropy of Sb2Se3 NW, combined with controllable preparation endows it with great potential for constructing multifunctional optoelectronic devices. High crystallinity Sb2Se3 nanowires with anisotropic crystallography are synthesized by using chemical vapor deposition growth. A Sb2Se3 nanowire‐based photodetector shows a wide photoresponse from visible to NIR with ultrafast rate and strong polarization dependence, which endows it great potential for constructing future multifunctional optoelectronic devices.