摘要
Polarization‐resolved photosensor is crucial in imaging and communication technologies.Molybdenum trichloride(MoCl_(3)),as a typical two‐dimensional(2D)transition metal trihalide,features the largest distortion in the transition metal‐based honeycomb skeletons,giving rise to the intrinsic in‐plane anisot-ropy that is ideal for polarization‐resolved optoelectronic devices.Here,we report the synthesis of MoCl_(3)van der Waals crystals using a solid‐phase re-action method for the application of a polarization‐sensitive photodetector.The as‐synthesized MoCl_(3)demonstrates high single crystallinity,which is validated by collaborating with X‐ray diffraction,transmission electron microscopy,and Raman characterizations.Additionally,the intrinsic lattice anisotropy of MoCl_(3)is illustrated by probing the orientation‐specific phonon vibration modes using polarized Raman and second‐harmonic generation spectra.By leveraging the extraordinary anisotropic characteristic,we fabricated MoCl_(3)photosensors for the detection of polarized optical signals,with a high linear dichroic ratio of 4.2 at 532 nm and fast photoresponse speed(<2 ms)from visible to near‐infrared bands.Moreover,the device demonstrates outstanding ambient stability,as revealed by its retained photoresponse behavior after being exposed to air for 6 months.Our results demonstrate the advantages of highly anisotropic crys-tals in hosting polarization‐sensitive photosensing functions,opening up new possibilities in developing innovative optoelectronic units.
基金
National Key Research and Development Program of China,Grant/Award Number:2024YFA1410700
Funding by Science and Technology Projects in Guangzhou,Grant/Award Number:2025A04J4771
the Scientific Research Innovation Project of Graduate School of South China Normal University
National Natural Science Foundation of China,Grant/Award Numbers:62374038,62204051
Natural Science Foundation of Shanghai,Grant/Award Number:22ZR1405700
Shanghai Rising‐Star Program,Grant/Award Number:22QA1401000。
