; Silicon_TEMTO - Enable & perfect your technologies!
    


Home > Products > Optical Products > Optical Materials > Silicon
Silicon

Usually we are handling Silicon monocrystalline, Czohralski (CZ) and Floatzone (FZ), optical and mirror grade.

Silicon (Si) is grown by Czochralski pulling techniques (CZ) and contains some oxygen that causes an absorption band at 9 microns. To avoid this, material can be prepared by a Float-Zone (FZ) process. Optical silicon is generally lightly doped (5 to 40 ohm cm) for best transmission above 10 microns, and doping is usually boron (p-type) and phosphorus (n-type). After doping silicon has a further pass band: 30 to 100 microns which is effective only in very high resistivity uncompensated material.

CZ Silicon is commonly used as substrate material for infrared reflectors and windows in the 1.5~8 micron region. The strong absorption band at 9 microns makes it unsuitable for CO2 laser transmission applications, but it is frequently used for laser mirrors because of its high thermal conductivity and low density. Application as window, lens in the 1.5~8 m region; Mirror for CO2 laser and spectrometer applications.

Si Mirror grade
Any dopant, any conductivity, any orientation, not warranted with respect to transmission, suitable for mirror substrates.

Si Optical grade
Czohralski (CZ), P type doped with Boron, <111> or <100>, Resistivity 5 - 40 ohmcm
Floatzone (FZ), N type doped with Phosphorus, <111>, Resistivity > 50, preferably > 500 ohmcm, the absorption at 9 microns is absent.


Main Properties

 

Crystal Properties
Crystal Growth Method
Czohralski (CZ) & Floatzone (FZ)
Max. Size (mm)
Czohralski (CZ)
Floatzone (FZ)
<350mm
<125mm
Optical Properties
Transmission Range
1.2~8um
Reflection Loss, for two surfaces at 5 m
46.2%
dn/dt (@633nm)/C
160x10-6
dn/d=0
10.4m
Refractive Index
See below
Wavelength (m)
Refractive Index (n)
Wavelength (m)
Refractive Index (n)
1.357
/
5.500
3.4213
1.3951
3.4975
6.000
3.4202
1.6606
3.4929
6.500
3.4195
1.8131
3.4608
7.000
3.4189
2.1526
3.4476
7.500
3.4186
2.3254
3.4430
8.000
3.4184
3.000
3.4320
8.500
3.4182
3.500
3.4284
10.00
3.4179
4.000
3.4257
10.50
3.4178
4.500
3.4236
11.04
3.4176
5.000
3.4223
Transmission Curve See below
Crystallographic Properties
Syngony
Cubic
Crystal Form  Polycrystalline or Monocrystalline
Lattice Constant, Angstrom (Å)
5.43
Physical Properties
Density
2.33g/cm3
Mohs Hardness
7
Dielectric Constant for 9.37x109 Hz
13
Melting Point, C
1414
Thermal Conductivity, W/mK at 273 K
163.3
Thermal Expansion, 1/K at 293 K
2.6x10-6
Specific Heat Capacity, J/(kg.C)
712.8
Bandgap, eV
1.1
Knoop Hardness, kg/mm2
1100
Youngs Modulus, Gpa
130.91
Shear Modulus, GPan
79.92
Bulk Modulus, GPa
101.97
Debye Temperature, K
640
Poissons Ratio
0.28
Chemical Properties
Chemical Formula
Si
Molecular Weight
28.09
Solubility in water
Insoluble

Copyright © 2004-2018 TEMTO Technology Co., Ltd, TEMTO®, All rights reserved. ICP05004887
Tel: +86-591-8787-0640  Fax: +86-591-8787-0641  E-mail: sales@temto.com  http://www.temto.com