Cu4 Bi4 S8

semiconductor

· Cu4 Bi4 S8

Cu4Bi4S8 is a quaternary semiconductor compound combining copper, bismuth, and sulfur in a layered or mixed-valence crystal structure. This material belongs to the family of chalcogenide semiconductors and is primarily studied for thermoelectric and optoelectronic applications due to its narrow bandgap and potential for phonon scattering through compositional complexity. While not yet widely deployed in high-volume commercial products, Cu4Bi4S8 represents an emerging research direction for energy conversion and sensing devices where cost-effective alternatives to traditional semiconductors are needed, particularly in applications tolerating moderate performance trade-offs for improved thermal stability or abundance of constituent elements.

thermoelectric energy conversionphotovoltaic devices (experimental)infrared detectorsthin-film electronics (research)sustainable semiconductor alternativesmid-range bandgap optoelectronics

Compliance & Regulations

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

Units:

si imperial

Property	Value	Unit	Conditions	Source
Bulk Modulus(K)	53.96	GPa	—
Shear Modulus(G)	22.45	GPa	—

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

Property	Value	Unit	Conditions	Source
Band Gap(Eg)	0.02130	eV	—

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

Property	Value	Unit	Conditions	Source
Formation Energy(ΔHf)	-0.3490	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.

Cu4 Bi4 S8

Mechanical Properties

Electrical Properties

Other Properties

Regulatory Screening

Environmental

Export Control