Small: polarized photodetectors based on low symmetry SBI3 / Sb2O3 core shell heterostructure nanowires

considers the polarization property of light which can increase the new dimension of photoelectric detection. Polarization detection is widely used in navigation ocean monitoring information tracking biological detection. High efficiency polarization detector needs high optical absorption detection anisotropy it also puts forward special requirements for semiconductor materials. Since the discovery of graphene due to its two-dimensional atomic layer structure unique physical properties more more low dimensional (two-dimensional one-dimensional) materials combined with van der Waals force have been applied to the field of Nano Electronics nano optoelectronics. For example two-dimensional materials with in-plane anisotropy such as black phosphorus (BP) germanium arsenide (GEAs) have been applied to high-performance polarized photodetectors. Some nanowires with in-plane anisotropic van der Waals force combination are also of great significance to optimize the performance of polarized photodetectors. Structural symmetry is a simple method to quantify the anisotropy of materials. By reducing the symmetry of the crystal structure of materials to build heterostructures can effectively improve the in-plane anisotropy so low dimensional heterostructures can further show higher anisotropy ratio.

V – VI compounds (sb Bi / s Se TE) V – VII compounds (as Sb Bi / CL Br I) which can be synthesized by chemical vapor deposition (CVD) have been widely used in photovoltaic field. It is predicted that they have suitable b gap adjustable b edge moderate mobility. Recently Wei Zhongming of Institute of semiconductors Chinese Academy of Sciences (CAS) prepared a novel core-shell heterostructure of antimony triiodide / antimony oxide (SBI3 / Sb2O3) nanowires by CVD. By artificially reducing the symmetry of the crystal structure the anisotropy was enhanced thus effectively improving the photocurrent anisotropy ratio of the nanowire based polarized light detector. The results were recently published in small (DOI: 10.1002 / small. 201907172). It has been proved theoretically experimentally that the anisotropic micro absorption properties of SBI3 / Sb2O3 core-shell nanowires (heterostructures bonded by van der Waals force) are significantly higher than those of the two compounds. The polarization sensitive photodetector based on SBI3 / Sb2O3 core-shell nanowires can measure the effective anisotropic photocurrent from ultraviolet to visible (360-532 nm). Compared with other reported one-dimensional materials with van der Waals structure the photocurrent anisotropy ratio (IMAX / Imin) of the detector based on one-dimensional SBI3 crystal is lower (1.16) but the photocurrent anisotropy ratio of the detector based on the core-shell heterostructure nanowires can be increased to 3.14 under 450 nm polarized light. The results show that the core-shell heterostructures obtained by reducing the crystal symmetry can be widely used in the field of high-performance polarized light detectors.

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