Bismuth selenide

Bismuth selenide

Names
IUPAC name selenium, selenoxobismuth, selanylidenebismuth
Identifiers
CAS Number	12068-69-8 Y
Jmol 3D model	Interactive image
PubChem	6379269
SMILES [Se-2].[Se-2].[Se-2].[Bi+3].[Bi+3]
Properties
Chemical formula	Bi2Se3
Molar mass	654.8 g/mol
Appearance	Dull grey
Density	6.82 g/cm^3
Melting point	710 °C (1,310 °F; 983 K)
Solubility in water	insoluble
Solubility	insoluble in organic solvents soluble in strong acids
Vapor pressure	{{{value}}}
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Bismuth selenide (Bi₂Se₃) is a gray powder that is a compound of bismuth and selenium also known as bismuth(III) selenide. It is a semiconductor and a thermoelectric material. While perfect stoichiometric bismuth selenide should be a semiconductor (with a gap of 0.3 eV) naturally occurring selenium vacancies act as electron donors and it often acts as a semimetal. Topologically protected surface states have been observed in Bismuth selenide which is the subject of ongoing scientific research.

See also

• Thermoelectric materials
• Thermoelectric effect
• Topological insulators