Molybdenum Diselenide Crystal


Not in stock (price excludes taxes)
Order Code: M2108A10
MSDS sheet

Pricing

Size Product code Size description* Quantity (EA) Price
Small M2108A10 >10 mm2 1 £356.5
Medium M2108A25 >25 mm2 1 £578.1
Large** M2108A00 >100 mm2 1 £1348

*typical representative size, areas/dimensions may vary

**item with a lead time of 2-3 weeks, please contact for more information


General Information

CAS number 12058-18-3
Chemical formula MoSe2
Molecular weight 253.86 g/mol
Bandgap 1.41 - 1.58 eV [1]
Synonyms Molybdenum (IV) selenide
Molybdenum selenide
Classification / Family Transition metal dichalcogenides (TMDCs), 2D semiconductor Materials, Nano-electronics, Nano-photonics, Electrochemical energy storage system, Materials science

Product Details

Form Single Crystal
Acquire method Synthetic - Chemical Vapour Transport (CVT)
Purity ≥ 99.995%
Structure Hexagonal
Electronic properties 2D semiconductor
Melting point >1,300°C
Colour Black/Dark brown

 

General Description 

Like most of the transition metal dichalcogenides and graphite, molybdenum diselenide (MoSe2) has a two-dimensional layered structure - with the individual layers stacked together by weak van der Waals interactions. Due to the larger size and better conductivity of selenium over sulphur, MoSeis one of the best TMDCs of metallic nature. This also provides a great opportunity for hosting counterions in  electrochemical energy storage systems (such as lithium-ion and sodium-ion batteries).

Like MoS2, MoSeundergoes changes from indirect to direct band-gap transitions when bulk material (such as the bulk crystal) is reduced to monolayer film. However, unlike MoS2, few-layer MoSeflakes possess a nearly degenerate indirect and direct band-gap. An increase in temperature/pressure can effectively push the system toward the quasi-2D limit by reducing the coupling between the layers. MoS2, on the other hand, has indirect and direct band-gaps that are well-separated in energy - and hence, far from degenerate.

Compared to MoS2, MoSe2 exhibits higher electrical conductivity.

MoSe2 Molybdenum Diselenide Crystal body
The hexagonal structure of Molybdenum Diselenide (MoSe2).

Applications

In contrast to graphene, exfoliated monolayer or few-layer 2D MoSehas a direct band-gap. It has applications in transistors, photo-detectors, and photovoltaics. Due to its layered structure and the unique nature of selenium, MoSehas been widely used in lubricants and energy storage devices.

Synthesis

Molybdenum diselenide MoSe2 is manufactured via the process of chemical vapour transport (CVT) crystallisation, with purities of over 99.999% achieved.

Usage

Molybdenum diselenide MoSe2 single crystals are a great source for obtaining monolayer and few-layer MoSe2 via mechanical or liquid exfoliation. Single crystals can also be used directly in optical and scanning-probe microscopy (such as AFM and TEM studies).

 

Literature and Reviews

  1. Direct observation of the transition from indirect to direct bandgap in atomically thin epitaxial MoSe2, Y. Zhang et al., Nat. Nanotech., 9, 111–115 (2014); DOI: 10.1038/NNANO.2013.277.
  2. Large-Area Synthesis of Monolayer and Few-Layer MoSe2 Films on SiO2 Substrates, X. Lu et al., Nano Lett., 14 (5), 2419–2425 (2014); DOI: 10.1021/nl5000906.
  3. High-Mobility Transistors Based on Large-Area and Highly Crystalline CVD-Grown MoSe 2 Films on Insulating Substrates, J-S. Rhyee et al., Adv. Mater., 28, 2316–2321 (2016); DOI: 10.1002/adma.201504789.
  4. Large-Area Single-Layer MoSe2 and Its van der Waals Heterostructures,  G. Shim et al., CS Nano, 8 (7), 6655–6662 92014);
    DOI: 10.1021/nn405685j.
  5. Thermally Driven Crossover from Indirect toward Direct Bandgap in 2D Semiconductors: MoSe2 versus MoS2, S. Tongay et al., Nano Lett., 12, 5576−5580 (2012); DOI: 10.1021/nl302584w.