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ۼ : 17-11-01 09:13
[2017.11] Structural and Optical Properties of Single- and Few-Layer Magnetic Semiconductor CrPS4
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ȸ : 109  

Structural and Optical Properties of Single- and Few-Layer Magnetic Semiconductor CrPS4


Jinhwan Lee, Taeg Yeoung Ko, Jung Hwa Kim, Hunyoung Bark, Byunggil Kang, Soon-Gil Jung, Tuson Park, Zonghoon Lee, Sunmin Ryu*, and Changgu Lee*



 Atomically thin 2-dimensional semiconductors exhibit diverse physical properties depending on their composition, structure and thickness. Endowing magnetism in these materials will lead to discovery of novel properties and greatly expand potential applications. In this work, we report structural and optical properties of atomically thin chromium thiophosphate (CrPS4), a ternary antiferromagnetic semiconductor. Its structural details were revealed by X-ray and electron diffractions. Transmission electron microscopy showed that preferentially-cleaved edges are parallel to diagonal Cr atom rows, which readily identified their crystallographic orientations. Strong in-plane optical anisotropy induced birefringence that also enabled efficient determination of crystallographic orientation using polarized microscopy. The lattice vibrations were probed by Raman spectroscopy for the first time and exhibited significant dependence on thickness of crystals exfoliated down to single layer. Optical absorption determined by reflectance contrast was dominated by d-d type transitions localized at Cr3+ ions, which was also responsible for the major photoluminescence peak at 1.31 eV. The spectral features in the absorption and emission spectra exhibited noticeable thickness-dependence and hinted a high photochemical activity for single layer CrPS4. The current structural and optical investigation will provide a firm basis for future study and application of this novel magnetic semiconductor.




  ֱ а迡 2 ڼü ʿ ۵ǰ ȹ ڼ żμ ū ָ ް ִ. ڼ ݵü
chromium thiophosphate (CrPS4) 36K Neel temperature ݰڼ Ư Ÿ. ش ȭݹ (chemical vapor transport) ̿Ͽ CrPS4 ռϰ, ڸ иϿ β б Ư Ͽ. 漺 ̿Ͽ ϴ Ͽ, bulk Ʈ β 2 CrPS4 Ư Ͽ. ˷ 2 ޸ ̰ Cr3+ ̿¿ ȭǾ ־ ߱ Ư β ū ʴ´ٴ ߰Ͽ. ڼ ũ (Cr) ٸ ڼ ö(Fe) پ ġȯ ־ پ ̸, ¿ ڼ ġȯ ִٸ 2 ڼݵüμ Ȱ뵵 ̴. ش 2017 10 25 ACS Nano Ǿ.


 
 

Total 77
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77 [2017.11] Triazenyl Radicals Stabilized by N-Heterocyclic Carbenes 11-21 26
76 [2017.11] Interface-Confined Doubly Anisotropic Oxidation of Two-Dimensional MoS2 11-08 86
75 [2017.11] Structural and Optical Properties of Single- and Few-Layer Magnetic Semiconductor CrPS4 11-01 110
74 [2017.10] Therapeutic gas responsive hydrogel 10-16 112
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71 [2017.06]ڹ Tattooing Dye as a Green Electrode Material for Lithium Batteries 07-03 325
70 [2017.04]輺 Cancer-Microenvironment-Sensitive Activatable Quantum Dot Probe in the Second Near-Infrared Window 04-20 608
69 [2017.01]ȯ Chemoselective Coupling of 1,1-Bis[(pinacolato)boryl]alkanes for the Transition-Metal-Free Borylation of Aryl and Vinyl Halides: A Combined Experimental and Theoretical Invesitigation 01-02 1132
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67 [2016.09]α Ultrathin and Flat Layer Black Phosphorus Fabricated by Reactive Oxygen and Water Rinse 09-22 1037
66 [2016.08]ö Unique Crystallization of Fullerenes: Fullerene Flowers 08-30 635
65 [2016.08]ö Nanocomb Architecture Design Using Germanium Selenide as High Performance Lithium Storage Material 08-29 921
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