TY - JOUR
T1 - Highly Sensitive Polarization Photodetection Using a Pseudo-One-Dimensional Nb (1- x) Ti x S 3 Alloy
AU - Yang, Shengxue
AU - Wu, Minghui
AU - Shen, Wanfu
AU - Huang, Li
AU - Tongay, Sefaattin
AU - Wu, Kedi
AU - Wei, Bin
AU - Qin, Ying
AU - Wang, Zhongchang
AU - Jiang, Chengbao
AU - Hu, Chunguang
N1 - Publisher Copyright:
© 2018 American Chemical Society.
PY - 2019/1/23
Y1 - 2019/1/23
N2 - Low-symmetry layered two-dimensional (2D) materials with strong in-plane optical anisotropy can potentially be applied for polarization photodetection. This is especially true for those 2D materials with a direct band gap, which can efficiently absorb light with specific axial polarization. However, discovering such new anisotropic 2D materials with a direct band structure is still extremely challenging. Here, we fabricate a photodetector using a pseudo-one-dimensional (pseudo-1D) Nb (1-x) Ti x S 3 alloy device and demonstrate that it is highly sensitive to the polarized light because of the strong in-plane optical anisotropy and direct band gap of the alloy by combining angle-resolved polarization Raman spectroscopy, azimuth-dependent reflectance difference microscopy, polarization-dependent absorption spectroscopy, and hybrid functional theory calculations. As a consequence, the polarization photodetector of the Nb (1-x) Ti x S 3 alloy shows a large photocurrent anisotropic ratio and a high photoresponse. The choice of a low-symmetry layered pseudo-1D Nb (1-x) Ti x S 3 alloy in polarization photodetection might open up new functionalities for novel optoelectronic device applications.
AB - Low-symmetry layered two-dimensional (2D) materials with strong in-plane optical anisotropy can potentially be applied for polarization photodetection. This is especially true for those 2D materials with a direct band gap, which can efficiently absorb light with specific axial polarization. However, discovering such new anisotropic 2D materials with a direct band structure is still extremely challenging. Here, we fabricate a photodetector using a pseudo-one-dimensional (pseudo-1D) Nb (1-x) Ti x S 3 alloy device and demonstrate that it is highly sensitive to the polarized light because of the strong in-plane optical anisotropy and direct band gap of the alloy by combining angle-resolved polarization Raman spectroscopy, azimuth-dependent reflectance difference microscopy, polarization-dependent absorption spectroscopy, and hybrid functional theory calculations. As a consequence, the polarization photodetector of the Nb (1-x) Ti x S 3 alloy shows a large photocurrent anisotropic ratio and a high photoresponse. The choice of a low-symmetry layered pseudo-1D Nb (1-x) Ti x S 3 alloy in polarization photodetection might open up new functionalities for novel optoelectronic device applications.
KW - Nb Ti S ternary alloy
KW - in-plane optical anisotropy
KW - low-symmetry structure
KW - polarization-sensitive photodetector
KW - pseudo-one-dimensional materials
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U2 - 10.1021/acsami.8b19050
DO - 10.1021/acsami.8b19050
M3 - Article
C2 - 30586287
AN - SCOPUS:85060036685
SN - 1944-8244
VL - 11
SP - 3342
EP - 3350
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
IS - 3
ER -