CdSe2
CdSe2 is a stable semiconducting compound composed of cadmium and selenium that is frequently studied for its diverse structural configurations.
About CdSe2
CdSe2 is a thermodynamically stable member of the II-VI semiconductor family. Its electronic character positions it as a significant material for research into optoelectronic and sensing applications where stable, semiconducting behavior is required.
The compound is characterized by its high structural diversity, supported by extensive reporting across multiple databases. This wealth of structural data makes it a compelling subject for materials scientists investigating the fundamental properties of metal chalcogenides.
Key Properties
Cross-validated computational properties for CdSe2, aggregated across 4 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.
Reported Structures
Lowest-energy structures reported for CdSe2, 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. |
|---|---|---|---|---|---|
| Pa-3 (No. 205) | cubic | 0.61 | 0.0000 | -3.286 | 5.85 |
| P1 (No. 1) | Triclinic | — | — | — | 5.01 |
| Pa-3 (No. 205) | Cubic | — | — | — | 5.99 |
| C2/m (No. 12) | Monoclinic | — | — | — | 5.99 |
| P-1 (No. 2) | Triclinic | — | — | — | 5.11 |
| C2/m (No. 12) | Monoclinic | — | — | — | 5.42 |
| — | — | — | — | — | 6.28 |
| P-1 (No. 2) | Triclinic | — | — | — | 3.51 |
| P-1 (No. 2) | Triclinic | — | — | — | 4.23 |
| P-1 (No. 2) | Triclinic | — | — | — | 5.96 |
| P4/mmm (No. 123) | Tetragonal | — | — | — | 5.02 |
| Pa-3 (No. 205) | Cubic | — | — | — | 6.08 |
Applications
Where CdSe2 is used.
Frequently Asked Questions
Common questions about CdSe2, answered from cross-validated data.
What is CdSe2?
CdSe2 is a stable semiconducting compound composed of cadmium and selenium that is frequently studied for its diverse structural configurations.
What is CdSe2 used for?
What is the band gap of CdSe2?
Is CdSe2 a metal, semiconductor, or insulator?
Is CdSe2 thermodynamically stable?
What is the crystal structure of CdSe2?
What is the density of CdSe2?
How many polymorphs of CdSe2 are known?
What elements does CdSe2 contain?
Where does the data for CdSe2 come from?
How It Compares
Within the ii-vi semiconductors class.
Within the II-VI semiconductor class, CdSe2 occupies a distinct position compared to more common binary compounds like CdS or CdTe. While its siblings often feature simpler stoichiometric ratios, CdSe2 represents a more complex structural arrangement that expands the design space for cadmium-based chalcogenides.
Related Compounds
Other II-VI Semiconductors in the database.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- mpaloe — Data from mpaloe.
- omat24 — Data from OMat24 (Meta FAIR). Cite: Barroso-Luque et al., arXiv 2410.12771 (2024).
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