Bi4 S8

semiconductor

· Bi4 S8

Bi₄S₈ is a bismuth sulfide compound semiconductor belonging to the metal chalcogenide family, characterized by layered crystal structure and mixed-valence bismuth chemistry. This material is primarily of research interest for optoelectronic and thermoelectric applications, where its narrow bandgap and anisotropic properties offer potential advantages in infrared detection, photovoltaic devices, and solid-state cooling systems. While not yet widely commercialized, Bi₄S₈ and related bismuth chalcogenides represent an emerging platform for low-toxicity alternatives to lead-based semiconductors and for exploring band structure engineering in quasi-2D materials.

infrared photodetectorsthermoelectric devicesphotovoltaic researchoptoelectronic componentslead-free semiconductor alternatives

Compliance & Regulations

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

Units:

si imperial

Property	Value	Unit	Conditions	Source
Bulk Modulus(K)	5,824.1	ksi	—
Shear Modulus(G)	3,285.5	ksi	—

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

Property	Value	Unit	Conditions	Source
Band Gap(Eg)	1.170	eV	—

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

Property	Value	Unit	Conditions	Source
Formation Energy(ΔHf)	-0.3670	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.

Bi4 S8

Mechanical Properties

Electrical Properties

Other Properties

Regulatory Screening

Environmental

Export Control