Silicon (Si) — Properties & Data | MatWorld

Silicon (Si)

Name: Silicon (Si)
Brand: MatWorld

Verifiedsemiconductor

· Si· Silicon· c-Si· Crystalline Silicon

Silicon is a crystalline semiconductor element that forms the foundation of modern microelectronics and photovoltaics. It is the primary material for integrated circuits, discrete transistors, and solar cells due to its ability to be precisely doped and processed into p-n junctions that control electrical current. Beyond electronics, silicon is valued in MEMS (micro-electromechanical systems), optical applications, and high-temperature structural uses where its combination of strength, thermal stability, and controlled electrical properties outperform metals and insulators.

integrated circuits and microprocessorssolar photovoltaic cellsdiscrete semiconductors (diodes, transistors)MEMS and sensorsoptoelectronic deviceshigh-temperature structural applications

Compliance & Regulations

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

Units:

si imperial

Property OverviewNormalized to typical max values

Property	Value	Unit	Conditions	Source
Poisson's Ratio(ν)	0.2800	-	—
Young's Modulus(E)	130.0	GPa	—

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

5 interactive curves for this material

Stress-strain, S-N fatigue and environmental knockdown curves are free with an account.

Create free account

Filter by

Form

Method

Property	Value	Unit	Conditions
Melting Point / Solidus(Tm)	1,687	K	—
Specific Heat Capacity(Cp)	700	J/(kg·K)	—
Specific Heat vs Temperature(Cp(T))	Curve (6 pts)	J/(kg·K)	—
Thermal Conductivity(k)	150	W/(m·K)	Measured
Thermal Conductivity vs Temperature(k(T))4 entries	Curve (7 pts)	W/(m·K)	—
↳	Curve (17 pts)	W/(m·K)	Measured · single crystal
↳	Curve (26 pts)	W/(m·K)	Measured · single crystal
↳	Curve (45 pts)	W/(m·K)	Measured · bulk
Coefficient of Thermal Expansion(α (CTE))	0.00000260	1/K	—

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

Property	Value	Unit	Conditions	Source
Density(ρ)	2.329	kg/m³	—

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

Filter by

Method

Carrier

Property	Value	Unit	Conditions
Band Gap(Eg)4 entries	1.120	eV	—
↳	0.7310	eV	DFT · OptB88vdW
↳	1.277	eV	DFT · TBmBJ
↳	1.220	eV	DFT · HSE06
Dielectric Constant (Relative Permittivity)(εr)	11.70	-	—
High-Frequency Dielectric Constant (ε∞)(ε∞)2 entries	13.49	-	DFT · OptB88vdW
↳	10.74	-	DFT · TBmBJ
Electron Effective Mass(m*e)	0.3100	me	DFT · OptB88vdW · 27°C
Hole Effective Mass(m*h)	0.4500	me	DFT · OptB88vdW · 27°C
Electrical Resistivity(ρe)	2,300	Ω·m	—
Thermoelectric Power Factor(PF)2 entries	0.00405	W/(m·K²)	DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C
↳	0.00384	W/(m·K²)	DFT · OptB88vdW · p-type · 1e20 cm⁻³ · 327°C
Seebeck Coefficient(S)2 entries	-224	μV/K	DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C
↳	230.2	μV/K	DFT · OptB88vdW · p-type · 1e20 cm⁻³ · 327°C
Spectroscopic Limited Maximum Efficiency (SLME)(SLME)	33.23	%	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.

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

16 interactive curves for this material

Stress-strain, S-N fatigue and environmental knockdown curves are free with an account.

Create free account

Property	Value	Unit	Conditions	Source
Extinction Coefficient vs Wavelength(k(λ))	Curve (121 pts)	-	Measured · 27°C
Refractive Index vs Wavelength(n(λ))	—	-	15 entriesClick to expand

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.

Silicon (Si)

Mechanical Properties

Thermal Properties

Physical Properties

Electrical Properties

Optical Properties

Regulatory Screening

Environmental

Export Control