K4 As2 Au2 S8

semiconductor

· K4 As2 Au2 S8

K₄As₂Au₂S₈ is a mixed-metal sulfide semiconductor compound containing potassium, arsenic, gold, and sulfur in a layered or complex crystal structure. This is a research-phase material belonging to the family of multinary metal chalcogenides, studied primarily for its electronic and optical properties rather than established industrial production. Interest in this compound stems from potential applications in thermoelectrics, photovoltaics, and optoelectronic devices where the presence of gold and arsenic can modify band structure and charge-carrier behavior; however, toxicity concerns (arsenic), scarcity of gold, and material stability remain significant barriers to practical adoption compared to conventional semiconductor alternatives.

experimental semiconductorsthermoelectric researchphotovoltaic materials (research)optoelectronic devices (exploratory)solid-state physicslaboratory/academic synthesis

Compliance & Regulations

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

Units:

si imperial

Property	Value	Unit	Conditions	Source
Band Gap(Eg)	0.1260	eV	—

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

Property	Value	Unit	Conditions	Source
Formation Energy(ΔHf)	-0.7080	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 As2 Au2 S8

Electrical Properties

Other Properties

Regulatory Screening

Environmental

Export Control