Strong Anisotropic Two-Dimensional In 2 Se 3 for Light Intensity and Polarization Dual-Mode High-Performance Detection.

Detecting the light from different freedom is of great significance to gain more information. Two-dimensional (2D) materials with low intrinsic carrier concentration and highly tunable electronic structure have been considered as the promising candidate for future room-temperature multi-functional photodetectors. However, current investigations mainly focus on intensity-sensitive detection; the multi-dimensional photodetection such as polarization-sensitive photodetection is still in its early stage. Herein, the intensity- and polarization-sensitive photodetection based on α-InSe is studied. By using angle-resolved polarized Raman spectroscopy, it is demonstrated that α-InSe shows an anisotropic phonon vibration property indicating its asymmetric structure. The α-InSe-based photodetector has a photoelectric performance with a responsivity of 1936 A/W and a specific detectivity of 2.1 × 10 Jones under 0.2 mW/cm power density at 400 nm. Moreover, by studying the polarized angle-resolved photoelectrical effect, it is found that the ratio of maximum and minimum photocurrent (dichroic ratio) reaches 1.47 at 650 nm suggesting good polarization-sensitive detection. After post-annealing, α-InSe in situ converts to β-InSe which has similar in-plane anisotropic crystallinity and exhibits a dichroic ratio of 1.41. It is found that the responsivity of β-InSe is 6 A/W, much lower than that of α-InSe. The high-performance light intensity- and polarization-detection of α-InSe enlarges the 2D anisotropic materials family and provides new opportunities for future dual-mode photodetection.