Low‐Symmetry 2D Perovskite CaNb2O6 for Polarization‐Sensitive UV Photodetection. Issue 24 (10th October 2022)

• Record Type: Journal Article
• Authors: Qin, Jing‐Kai; Xiao, Hui; Zhu, Cheng‐Yi; Zhen, Liang; Xu, Cheng‐Yan
• Is Part Of: Advanced optical materials. Volume 10:Issue 24(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-10-10
• Subjects: CaNb 2O 6 -- image sensors -- layered materials -- polarization‐sensitivity; Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.202201627
• Languages: English
• ISSNs: 2195-1071

Abstract

Abstract: Polarization‐sensitive photodetection in ultraviolet (UV) range has demonstrated broad applications in both military and civilian fields. As the key component of polarized UV photodetectors, semiconducting materials with wide bandgaps and intrinsic low‐symmetry are highly desired. Herein, perovskite calcium niobate (CaNb2 O6 ) is re‐introduced to the family of two‐dimensional (2D) layered materials for UV‐polarized photodetection. Using a simple vapor phase epitaxy growth process, CaNb2 O6 nanosheets are successfully synthesized, which can be scaled down to monolayers with thickness of about 0.8 nm. The anisotropic structural, vibrational, and optical properties of CaNb2 O6 are systematically investigated. Photodetectors based on 2D CaNb2 O6 present a large dichroic ratio of 2.1 at 375 nm light irradiation, exceeding most of reported UV photodetectors, and the large anisotropic ratio also contributes to a high‐resolution polarization imaging. This work demonstrates that the 2D CaNb2 O6 has promising potential for developing next‐generation polarized UV detecting and imaging technology. Abstract : Two‐dimensional (2D) perovskite calcium niobate (CaNb2 O6 ) is first synthesized using a simple vapor phase epitaxy growth process, and it reveals strong in‐plane anisotropy in structural, vibrational, and optical properties. Under 375 nm light irradiation, photodetectors based on 2D CaNb2 O6 present a large dichroic ratio of 2.1. These results demonstrate that 2D CaNb2 O6 has promising potential for developing next‐generation polarized UV detecting and imaging technology.