A mercury probe connected to capacitance-voltage doping profile instrumentation could measure an epitaxial layer as soon as it came out of the epitaxial reactor.
12.
Two main parameters govern both the breakdown voltage and the R DSon of the transistor : the doping level and the thickness of the N " epitaxial layer.
13.
However, it will form a polycrystalline film unless tightly controlled, and it allows oxidizing species that leak into the reactor to contaminate the epitaxial layer with unwanted compounds such as silicon dioxide.
14.
With a vertical structure, the voltage rating of the transistor is a function of the epitaxial layer ( see cross section ), while the current rating is a function of the channel width.
15.
In a CCD for capturing images, there is a photoactive region ( an epitaxial layer of silicon ), and a transmission region made out of a shift register ( the CCD, properly speaking ).
16.
With the vertical structure, the component area is roughly proportional to the current it can sustain, and the component thickness ( actually the N-epitaxial layer thickness ) is proportional to the breakdown voltage.
17.
The clocking of the gates, alternately high and low, will forward and reverse bias the diode that is provided by the buried channel ( n-doped ) and the epitaxial layer ( p-doped ).
18.
The epitaxial layers may consist of compounds with particular desirable features such as gallium nitride ( GaN ), gallium arsenide ( GaAs ), or some combination of the elements gallium, indium, aluminum, nitrogen, phosphorus or arsenic.
19.
Materials used for the substrate include silicon, gallium arsenide, and indium phosphide, while silicon / silicon-germanium alloys, aluminium gallium arsenide / gallium arsenide, and indium phosphide / indium gallium arsenide are used for the epitaxial layers.
20.
The voltage rating of the transistor is a function of the doping and thickness of the N-epitaxial layer ( see cross section ), while the current rating is a function of the channel width ( the wider the channel, the higher the current ).
