Ge8K8Se20
Ge8K8Se20 is a stable, semiconducting germanium-based chalcogenide used in research for advanced photovoltaic and optoelectronic technologies.
About Ge8K8Se20
Ge8K8Se20 is a complex semiconducting compound composed of germanium, potassium, and selenium. Its position on the convex hull indicates that it is a thermodynamically stable phase, making it a significant subject for structural and electronic investigations within the broader landscape of chalcogenide materials.
This material is primarily studied for its potential in optoelectronic and photovoltaic applications. Its semiconducting nature allows for tunable electronic properties, which are essential for developing next-generation energy conversion devices that require stable and efficient light-harvesting architectures.
Key Properties
Cross-validated computational properties for Ge8K8Se20, 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 Ge8K8Se20, 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. |
|---|---|---|---|---|---|
| P21/m (No. 11) | monoclinic | 1.95 | 0.0000 | -4.174 | 3.45 |
| P21/c (No. 14) | monoclinic | 1.95 | 0.0034 | -4.170 | 3.33 |
| No. 0 | unknown | — | — | — | 0.92 |
| P21/m (No. 11) | — | — | — | — | — |
| — | — | — | — | — | 3.29 |
Applications
Where Ge8K8Se20 is used.
Frequently Asked Questions
Common questions about Ge8K8Se20, answered from cross-validated data.
What is Ge8K8Se20?
Ge8K8Se20 is a stable, semiconducting germanium-based chalcogenide used in research for advanced photovoltaic and optoelectronic technologies.
What is Ge8K8Se20 used for?
What is the band gap of Ge8K8Se20?
Is Ge8K8Se20 a metal, semiconductor, or insulator?
Is Ge8K8Se20 thermodynamically stable?
What is the crystal structure of Ge8K8Se20?
What is the density of Ge8K8Se20?
How many polymorphs of Ge8K8Se20 are known?
What elements does Ge8K8Se20 contain?
Where does the data for Ge8K8Se20 come from?
How It Compares
Within the halide perovskite photovoltaics class.
Unlike the well-known halide perovskites such as CsPbBr3 or CsSnI3, which typically feature lead or tin centers, Ge8K8Se20 utilizes a distinct germanium-selenium framework. While its siblings in the perovskite-related class often focus on halide-based ionic lattices, this compound represents a shift toward more complex chalcogenide chemistry, offering a different structural paradigm for semiconductor design.
Related Compounds
Other Halide Perovskite Photovoltaics in the database.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- cod — Data from the Crystallography Open Database. Cite: Grazulis et al., Nucleic Acids Res. 40, D420 (2012).
- aflow — Data from AFLOW. Cite: Curtarolo et al., Comp. Mater. Sci. 58, 218 (2012).
- omat24 — Data from OMat24 (Meta FAIR). Cite: Barroso-Luque et al., arXiv 2410.12771 (2024).
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