Ag2Se
Silver selenide · Aguilarite
Silver selenide is a binary inorganic compound composed of silver and selenium. It is a semiconductor material often studied for its unique electronic and optical properties in thin-film technologies.
AgSe
Overview
Key Properties
Cross-validated computational properties for Silver selenide, 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.
0.03–1.71 eV
Range across DFT structures
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.
0.000 eV/atom
Best (lowest) across sources
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.
On hull (stable)
2 DFT sources
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
69
4 databases, 18 space groups
Validation
Cross-Source DFT Agreement
How well independent DFT databases agree on the thermodynamics of Ag2Se. 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.
1.00 / 1.00
Trust tier: medium
Hull SpreadDifference between the highest and lowest energy-above-hull values reported by comparable sources. Smaller spread means less thermodynamic disagreement.
0.000 eV
EAH spread across sources
Sources ComparedNumber and names of computational sources with comparable entries for this formula.
2
jarvis, materials_project
Space Group ConsensusWhether independent sources predict the same crystal symmetry for the lowest-energy structure.
All match
Crystallography
Reported Structures
Lowest-energy structures reported for Ag2Se, 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. |
|---|---|---|---|---|---|
| P212121 (No. 19) | orthorhombic | 0.00 | 0.0000 | -19.141 | 7.94 |
| P212121 (No. 19) | orthorhombic | 0.00 | 0.0023 | -19.139 | 8.11 |
| P212121 (No. 19) | orthorhombic | 0.14 | 0.0050 | -19.136 | 7.26 |
| Pnma (No. 62) | orthorhombic | 0.97 | 0.0068 | -19.134 | 7.09 |
| Pnma (No. 62) | orthorhombic | 0.19 | 0.0121 | -19.129 | 7.99 |
| Fm-3m (No. 225) | cubic | 0.09 | 0.0253 | -19.116 | 7.25 |
| Cmce (No. 64) | orthorhombic | 0.00 | 0.0421 | -19.099 | 7.88 |
| P212121 (No. 19) | orthorhombic | 1.71 | 0.0523 | -19.089 | 5.39 |
| Pmma (No. 51) | orthorhombic | 0.00 | 0.1257 | -19.015 | 7.32 |
| P2221 (No. 17) | orthorhombic | 0.00 | 0.1262 | -19.015 | 7.32 |
| P1 (No. 1) | triclinic | 0.03 | 2.3797 | -16.761 | 0.63 |
| Cm (No. 8) | Monoclinic | — | — | — | 6.05 |
Uses
Applications
Where Silver selenide is used.
Photovoltaic devicesInfrared optical componentsThermoelectric researchSensors
Reference
Frequently Asked Questions
Common questions about Silver selenide, answered from cross-validated data.
What is Ag2Se?
Silver selenide is a binary inorganic compound composed of silver and selenium. It is a semiconductor material often studied for its unique electronic and optical properties in thin-film technologies.
More questions
What is Ag2Se used for?
Silver selenide (Ag2Se) is used in photovoltaic devices, infrared optical components, thermoelectric research, and sensors.
What is the band gap of Ag2Se?
Silver selenide (Ag2Se) has a DFT-computed band gap of 0.03–1.71 eV across 69 reported structures.
Is Ag2Se a metal, semiconductor, or insulator?
With a band gap up to 1.71 eV it is a semiconductor.
Is Ag2Se thermodynamically stable?
Yes — Silver selenide (Ag2Se) sits on the convex hull (energy above hull 0 eV/atom), i.e. on hull (stable).
What is the crystal structure of Ag2Se?
The lowest-energy reported polymorph of Silver selenide (Ag2Se) is orthorhombic symmetry, space group P212121 (No. 19).
What is the density of Ag2Se?
The computed density of the ground-state structure of Silver selenide (Ag2Se) is 7.94 g/cm³.
How many polymorphs of Ag2Se are known?
69 structures of Ag2Se are reported across 4 databases, spanning 18 distinct space groups.
What elements does Ag2Se contain?
Silver selenide (Ag2Se) contains Ag and Se (2 elements).
Where does the data for Ag2Se come from?
Ag2Se data is cross-referenced from materials_project, mpaloe.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- mpaloe — Data from mpaloe.
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