K4 Cu4 S4

semiconductor

· K4 Cu4 S4

K₄Cu₄S₄ is a quaternary semiconductor compound combining potassium, copper, and sulfur in a stoichiometric ratio, representing an emerging material in solid-state chemistry research rather than an established commercial product. This compound belongs to the family of multinary sulfide semiconductors, which are being investigated for photovoltaic applications, solid-state electronics, and ion-conductor applications where mixed-metal sulfides offer tunable bandgaps and ionic conductivity. The material is primarily of academic and exploratory interest, with potential relevance to next-generation battery electrolytes, thin-film solar cells, and thermoelectric devices where earth-abundant copper and sulfur-based alternatives to conventional semiconductors are sought.

experimental photovoltaicssolid-state battery electrolytesion-conducting devicesthin-film semiconductorsresearch-stage thermoelectricsmultinary sulfide compounds

Compliance & Regulations

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

Units:

si imperial

Property	Value	Unit	Conditions	Source
Bulk Modulus(K)	19.62	GPa	—
Shear Modulus(G)	5.873	GPa	—

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

Property	Value	Unit	Conditions	Source
Band Gap(Eg)	1.963	eV	—

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

Property	Value	Unit	Conditions	Source
Formation Energy(ΔHf)	-0.8380	eV/atom	—

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

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.

K4 Cu4 S4

Mechanical Properties

Electrical Properties

Other Properties

Regulatory Screening

Environmental

Export Control