Phase-Engineered Synthesis of Centimeter-Scale 1T'- and 2H-Molybdenum Ditelluride Thin Films.

We report the synthesis of centimeter-scale, uniform 1T'- and 2H-MoTe2 thin films via the tellurization of Mo thin films. 1T'-MoTe2 was initially grown and converted gradually to 2H-MoTe2 over a prolonged growth time under a Te atmosphere. Maintaining excessive Te was essential for obtaining the stable stoichiometric 2H-MoTe2 phase. Further annealing under a lower partial pressure of Te at the same temperature, followed by a rapid quenching, led to the reverse phase transition from 2H-MoTe2 to 1T'-MoTe2. The orientation of the 2H-MoTe2 film was determined by the tellurization rate. Slow tellurization was the key for obtaining a highly oriented 2H-MoTe2 film over the entire area, while fast tellurization led to a 2H-MoTe2 film with a randomly oriented c-axis.

[1]  Suyeon Cho,et al.  Bandgap opening in few-layered monoclinic MoTe2 , 2015, Nature Physics.

[2]  Chi Won Ahn,et al.  Large-area single-layer MoSe2 and its van der Waals heterostructures. , 2014, ACS nano.

[3]  E. Reed,et al.  Structural phase transitions in two-dimensional Mo- and W-dichalcogenide monolayers , 2014, Nature Communications.

[4]  Yan Xin,et al.  Field-effect transistors based on few-layered α-MoTe(2). , 2014, ACS nano.

[5]  Kazuhito Tsukagoshi,et al.  Strong enhancement of Raman scattering from a bulk-inactive vibrational mode in few-layer MoTe₂. , 2014, ACS nano.

[6]  R. Gorbachev.  Van der Waals heterostructures , 2014, Nature Reviews Methods Primers.

[7]  L. Lauhon,et al.  Emerging device applications for semiconducting two-dimensional transition metal dichalcogenides. , 2014, ACS nano.

[8]  Jian Zhen Ou,et al.  Two‐Dimensional Molybdenum Trioxide and Dichalcogenides , 2013 .

[9]  Andras Kis,et al.  Ultrasensitive photodetectors based on monolayer MoS2. , 2013, Nature nanotechnology.

[10]  Hua Zhang,et al.  The chemistry of two-dimensional layered transition metal dichalcogenide nanosheets. , 2013, Nature chemistry.

[11]  Desheng Kong,et al.  Synthesis of MoS2 and MoSe2 films with vertically aligned layers. , 2013, Nano letters.

[12]  G. Eda,et al.  Enhanced catalytic activity in strained chemically exfoliated WS₂ nanosheets for hydrogen evolution. , 2012, Nature materials.

[13]  Soon Cheol Hong,et al.  High‐Detectivity Multilayer MoS2 Phototransistors with Spectral Response from Ultraviolet to Infrared , 2012, Advanced materials.

[14]  Qing Hua Wang,et al.  Electronics and optoelectronics of two-dimensional transition metal dichalcogenides. , 2012, Nature nanotechnology.

[15]  L. Soulard,et al.  Experimental and numerical study of the tantalum single crystal spallation , 2012, The European Physical Journal B.

[16]  Hisato Yamaguchi,et al.  Coherent atomic and electronic heterostructures of single-layer MoS2. , 2012, ACS nano.

[17]  Ashok Kumar,et al.  Electronic structure of transition metal dichalcogenides monolayers 1H-MX2 (M = Mo, W; X = S, Se, Te) from ab-initio theory: new direct band gap semiconductors , 2012 .

[18]  Keliang He,et al.  Control of valley polarization in monolayer MoS2 by optical helicity. , 2012, Nature nanotechnology.

[19]  J. Long,et al.  A Molecular MoS2 Edge Site Mimic for Catalytic Hydrogen Generation , 2012, Science.

[20]  Wang Yao,et al.  Valley polarization in MoS2 monolayers by optical pumping. , 2012, Nature nanotechnology.

[21]  D. Hennig,et al.  Collective transport of coupled particles , 2012 .

[22]  Wang Yao,et al.  Coupled spin and valley physics in monolayers of MoS2 and other group-VI dichalcogenides. , 2011, Physical review letters.

[23]  Andras Kis,et al.  Stretching and breaking of ultrathin MoS2. , 2011, ACS nano.

[24]  Reshef Tenne,et al.  New Route for Stabilization of 1T-WS2 and MoS2 Phases , 2011 .

[25]  Baibiao Huang,et al.  Electronic and magnetic properties of perfect, vacancy-doped, and nonmetal adsorbed MoSe2, MoTe2 and WS2 monolayers. , 2011, Physical chemistry chemical physics : PCCP.

[26]  Sahaya Anand T. Joseph,et al.  Synthesis and Characterization of MoTe2 Thin Films for Photoelectro-chemical Cell Applications , 2011 .

[27]  A. Reina,et al.  Large area, few-layer graphene films on arbitrary substrates by chemical vapor deposition. , 2009, Nano letters.

[28]  Kwang S. Kim,et al.  Large-scale pattern growth of graphene films for stretchable transparent electrodes , 2009, Nature.

[29]  J. Nørskov,et al.  Hydrogen evolution on nano-particulate transition metal sulfides. , 2008, Faraday discussions.

[30]  Thomas F. Jaramillo,et al.  Identification of Active Edge Sites for Electrochemical H2 Evolution from MoS2 Nanocatalysts , 2007, Science.

[31]  Jacob Bonde,et al.  Biomimetic hydrogen evolution: MoS2 nanoparticles as catalyst for hydrogen evolution. , 2005, Journal of the American Chemical Society.

[32]  Growth of textured nonstoichiometric MoTe2 films from Mo/Te layers and their use as precursor in the synthesis of MoTe2−xSx films , 2004 .

[33]  R. Zeis,et al.  High-mobility field-effect transistors based on transition metal dichalcogenides , 2004 .

[34]  A two-step process for the synthesis of MoTe2 nanotubes: combining a sonochemical technique with heat treatment , 2003 .

[35]  P. Ramasamy,et al.  Study of anomalous electrical behaviour of molybdenum ditelluride single crystals , 1994 .

[36]  W. G. Dawson,et al.  Electronic structure and crystallography of MoTe2 and WTe2 , 1987 .

[37]  S. Sugai,et al.  High-pressure Raman spectroscopy in the layered materials 2H-MoS 2 , 2H-MoSe 2 , and 2H-MoTe 2 , 1982 .

[38]  B. L. Evans,et al.  The preparation and properties of transition metal dichalcogenide single crystals , 1972 .

[39]  R. D. Jonge,et al.  Semiconductor to metal transition in MoTe2 , 1970 .

[40]  J. Wilson,et al.  The transition metal dichalcogenides discussion and interpretation of the observed optical, electrical and structural properties , 1969 .

[41]  L. Brixner.  Preparation and properties of the single crystalline AB2-type selenides and tellurides of niobium, tantalum, molybdenum and tungsten☆ , 1962 .