Germanium

High purity germanium crystals

Crystals are produced from very pure starting material. The material is purified by using zone refining in graphite and quartz boats, then grown into large single crystals using the Czochralski method.

Specification

Growth process	CZ
Diameter, mm	40-100
Length, mm	as needed
Orientation	<100>
Net impurity	< (3-5) x 10¹⁰
Mobility, cm²/V.s	3.5 x 10⁴
EPD, cm^-2	5 x 10² - 5 x 10³

Doped germanium single crystals

Standard specifications

Dopant	Range of specific resistivity, nominal value, ohm.cm	EPD (no more than), cm^-2	Range of ingot diameter, mm	Length (not more than), mm
Sb	15-45	5 x 10³	28-35	50
Sb	6-14	5 x 10³ - 5 x 10⁴	28-35	50
Sb	0.1-5.5	5 x 10³ - 1 x 10⁴	28-35	50
Sb	0.01-0.09	2 x 10³ - 5 x 10⁴	20-35	40
Sb	0.004-0.009	5 x 10⁴	20-35	40
Ga	15-45	5 x 10³	28-35	50
Ga	6-14	5 x 10³	28-35	50
Ga	0.1-5.5	5 x 10³ - 1 x 10⁴	28-35	50
Ga	0.01-0.09	2 x 10³ - 5 x 10⁴	20-35	40
Ga	0.004-0.009	5 x 10³ - 5 x 10⁴	20-35	40
Ga	0.002-0.003	5 x 10³ - 5 x 10⁴	20-35	40
Ga	0.00045-0.001	5 x 10⁴	20-35	40
P	0.01-0.1	5 x 10³	20-35	40