Antimony triselenide is the chemical compound with the formula Sb2Se3. The material exists as the sulfosalt mineral antimonselite (IMA symbol: Atm[2]), which crystallizes in an orthorhombic space group.[3] In this compound, antimony has a formal oxidation state +3 and selenium −2. The bonding in this compound has covalent character as evidenced by the black color and semiconducting properties of this and related materials.[4] The low-frequency dielectric constant (ε0) has been measured to be 133 along the c axis of the crystal at room temperature, which is unusually large.[5] Its band gap is 1.18 eV at room temperature.[6]
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3D model (JSmol) |
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| ECHA InfoCard | 100.013.870 
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CompTox Dashboard (EPA) |
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| Properties | |
| Sb2Se3 | |
| Molar mass | 480.433 g·mol−1 |
| Appearance | black crystals |
| Density | 5.81 g/cm3, solid |
| Melting point | 611 °C (1,132 °F; 884 K) |
| Structure | |
| Orthorhombic, oP20, SpaceGroup = Pnma, No. 62 | |
| Hazards | |
| NIOSH (US health exposure limits): | |
PEL (Permissible) |
TWA 0.5 mg/m3 (as Sb)[1] |
REL (Recommended) |
TWA 0.5 mg/m3 (as Sb)[1] |
| Related compounds | |
Other anions |
antimony(III) oxide, antimony(III) sulfide, antimony(III) telluride |
Other cations |
arsenic(III) selenide, bismuth(III) selenide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
The compound may be formed by the reaction of antimony with selenium and has a melting point of 885 K.[4]
Sb2Se3 is now being actively explored for application thin-film solar cells.[7] A record light-to-electricity conversion efficiency of 9.2% has been reported.[8]
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