K2S

Name: K2S
Brand: MatWorld

semiconductor

· K2S

K2S (potassium sulfide) is an inorganic semiconductor compound belonging to the chalcogenide family, characterized by ionic bonding between potassium cations and sulfide anions. While primarily of research interest rather than established in high-volume production, K2S and related metal sulfides are investigated for optoelectronic and photovoltaic applications due to their semiconductor bandgap properties and potential for thin-film device fabrication. Interest in this material class stems from their lower toxicity profile compared to some cadmium- or lead-based alternatives, though processing challenges and moisture sensitivity have limited commercial deployment.

experimental photovoltaicsthin-film semiconductorsresearch optoelectronicschalcogenide materials developmentniche specialty semiconductors

Compliance & Regulations

?EAR?Conflict Free?RoHS?REACH?TSCA?Prop 65

Units:

si imperial

Property	Value	Unit	Conditions
Bulk Modulus(K)	3,006.6	ksi	DFT · OptB88vdW
Poisson's Ratio(ν)	0.3000	-	DFT · OptB88vdW
Shear Modulus(G)	1,430.1	ksi	DFT · OptB88vdW

Verified Unverified Low confidence (<80%) Link to source

Property	Value	Unit	Conditions	Source
Density(ρ)	0.06597	lb/in³	DFT · OptB88vdW

Verified Unverified Low confidence (<80%) Link to source

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Method

Carrier

Property	Value	Unit	Conditions
Band Gap(Eg)3 entries	2.100	eV	Measured
↳	2.384	eV	DFT · OptB88vdW
↳	4.997	eV	DFT · TBmBJ
Dielectric Constant (Relative Permittivity)(εr)3 entries	5.830	-	DFT · OptB88vdW
↳	6.360	-	DFT · PBE
↳	4.662 range 3.162–6.162median of 2 measurements	-	DFT · PBEsol
High-Frequency Dielectric Constant (ε∞)(ε∞)2 entries	3.543	-	DFT · OptB88vdW
↳	2.587	-	DFT · TBmBJ
Electronic Dielectric Tensor(ε∞)	Matrix (redacted)	-	DFT · PBE
Total Dielectric Tensor(ε)	Matrix (redacted)	-	DFT · PBE
Magnetic Moment(μB)	0.000	µB	DFT · OptB88vdW
Piezoelectric Modulus(eij)	0.000	C/m²	DFT · OptB88vdW
Thermoelectric Power Factor(PF)2 entries	0.000714	W/(m·K²)	DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C
↳	0.000612	W/(m·K²)	DFT · OptB88vdW · p-type · 1e20 cm⁻³ · 327°C
Seebeck Coefficient(S)2 entries	-102.5	μV/K	DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C
↳	539.2	μV/K	DFT · OptB88vdW · p-type · 1e20 cm⁻³ · 327°C
Spectroscopic Limited Maximum Efficiency (SLME)(SLME)	0.000	%	DFT · TBmBJ

N entriesMultiple entries per property — large groups are collapsed; click a summary row to expand. Use filters above to narrow by form, heat treatment, basis, or test environment.

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Method

Property	Value	Unit	Conditions
Energy Above Hull(ΔEhull)	0.000	eV/atom	DFT · OptB88vdW
Formation Energy(ΔHf)2 entries	-1.222	eV/atom	DFT · OptB88vdW
↳	-1.301	eV/atom	Measured

N entriesMultiple entries per property — large groups are collapsed; click a summary row to expand. Use filters above to narrow by form, heat treatment, basis, or test environment.

Verified Unverified Low confidence (<80%) Link to source

Reference data from cited sources. Not verified or certified by MatWorld Inc. Verify against the source before use in design. Terms: engineering data

Regulatory Screening

Environmental

Export Control

RoHS, REACH, and Prop 65 statuses are validated against official substance lists (ECHA SVHC Candidate List, OEHHA Prop 65, RoHS Annex II). Other regulations are estimated from composition and material classification. All screening is a starting point for due diligence — always verify with your supplier before making compliance decisions.

K2S — Properties & Data | MatWorld

K2S

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