CoSi
Cobalt monosilicide · Cobalt silicide
CoSi is a stable, metallic cobalt-silicon compound used primarily as a contact material in semiconductor electronics.
About Cobalt monosilicide
Cobalt monosilicide is a robust, thermodynamically stable intermetallic compound that occupies a significant position within the family of silicon-based materials. Characterized by its metallic electronic nature, it serves as a critical subject for researchers investigating the fundamental interactions between transition metals and silicon.
Its structural reliability and presence on the convex hull make it a foundational material for understanding phase formation in thin-film systems. Due to its metallic properties and stable crystal structure, it is widely utilized in the development of contacts and interconnects within semiconductor device architectures.
Key Properties
Cross-validated computational properties for Cobalt monosilicide, aggregated across 5 databases.
Band GapEnergy needed to move an electron from the valence band to the conduction band. Lower or zero values tend to behave more metallic; larger gaps are more insulating or semiconducting.
Energy Above HullThermodynamic distance from the most stable set of competing phases. 0 eV/atom is on the convex hull; small positive values may still be experimentally accessible.
StabilityA plain-language summary of the best reported energy-above-hull result. It reflects whether the lowest-energy structure is on, near, or far from the stability hull.
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
Cross-Source DFT Agreement
How well independent DFT databases agree on the thermodynamics of CoSi. Tight agreement means computed properties can be trusted without re-running calculations.
Agreement ScoreA normalized confidence score summarizing how closely independent DFT databases agree. Higher scores mean tighter cross-source agreement.
Hull SpreadDifference between the highest and lowest energy-above-hull values reported by comparable sources. Smaller spread means less thermodynamic disagreement.
Sources ComparedNumber and names of computational sources with comparable entries for this formula.
Space Group ConsensusWhether independent sources predict the same crystal symmetry for the lowest-energy structure.
Reported Structures
Lowest-energy structures reported for CoSi, ranked by energy above hull.
| Space GroupSymmetry classification of the crystal arrangement. The number is the international space-group index. | Crystal SystemBroad lattice family, such as cubic, tetragonal, monoclinic, or triclinic, derived from unit-cell symmetry. | Band Gap (eV)Electronic gap calculated for this specific reported structure, measured in electronvolts. | E above hull (eV/atom)Thermodynamic distance from the convex hull for this structure, normalized per atom. Lower is generally more stable. | E/atom (eV)Computed total energy normalized per atom. Use energy above hull, not this value alone, when comparing stability. | Density (g/cm³)Mass per relaxed crystal volume, reported in grams per cubic centimeter. |
|---|---|---|---|---|---|
| — | — | 0.00 | 0.0000 | -0.624 | — |
| P213 (No. 198) | cubic | 0.00 | 0.0000 | -0.497 | — |
| P213 (No. 198) | cubic | 0.00 | 0.0000 | -11.497 | 6.86 |
| Pm-3m (No. 221) | cubic | 0.00 | 0.2011 | -11.296 | 6.72 |
| — | — | 0.00 | 0.2099 | -0.414 | — |
| — | — | 0.00 | 0.2110 | -0.413 | — |
| Pm-3m (No. 221) | cubic | 0.00 | 0.2218 | -0.276 | — |
| — | — | 0.00 | 0.2305 | -0.394 | — |
| — | — | 0.00 | 0.2430 | -0.381 | — |
| — | — | 0.00 | 0.2523 | -0.372 | — |
| — | — | 0.00 | 0.6830 | 0.059 | — |
| — | — | 0.00 | 0.7024 | 0.078 | — |
Applications
Where Cobalt monosilicide is used.
Frequently Asked Questions
Common questions about Cobalt monosilicide, answered from cross-validated data.
What is CoSi?
CoSi is a stable, metallic cobalt-silicon compound used primarily as a contact material in semiconductor electronics.
What is CoSi used for?
What is the band gap of CoSi?
Is CoSi a metal, semiconductor, or insulator?
Is CoSi thermodynamically stable?
What is the crystal structure of CoSi?
How many polymorphs of CoSi are known?
What elements does CoSi contain?
Where does the data for CoSi come from?
How It Compares
Within the silicon anode materials class.
Within the diverse class of silicon-based materials, CoSi stands out for its metallic character compared to the semiconducting nature of elemental Si or the complex electronic behaviors found in silicides like BaSi2. While MoSi2 is often favored for high-temperature structural applications due to its refractory properties, CoSi is primarily valued for its compatibility with silicon integration and its role as a stable, conductive interface material.
Related Compounds
Other Silicon Anode Materials in the database.
Data sources & attribution
- oqmd — Data from the OQMD (oqmd.org). Cite: Saal et al., JOM 65, 1501 (2013); Kirklin et al., npj Comp. Mater. 1, 15010 (2015). (CC-BY-4.0)
- jarvis — Data from JARVIS (jarvis.nist.gov), NIST. Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020). (LicenseRef-US-Gov-PD)
- materials_project — Data from the Materials Project (materialsproject.org). Cite: Jain et al., APL Materials 1, 011002 (2013). (CC-BY-4.0)
- mpaloe — Data from MP-ALOE. Cite: Kuner et al., npj Comput. Mater. (2025), doi:10.1038/s41524-025-01834-9.
Analyze CoSi in the Lattice Graph platform
Polymorph comparison, confidence scoring, supply-chain risk, and patent monitoring — across 85 source databases.
Explore the Platform →