Semiconductor photoelectric cathode and phototube using the same semiconductor photoelctric cathode
A photocathode and semiconductor technology, applied in discharge tubes that do not contain gas ionization, photoemission cathodes, cathode ray tubes/electron beam tubes, etc., can solve problems such as difficult electron extraction
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[0028] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same symbols are used for the same elements, and overlapping descriptions are omitted.
[0029] figure 1 is a diagram showing a semiconductor photocathode according to a first embodiment of the present invention. The semiconductor photocathode 1 shown in the figure has a p + Type semiconductor substrate 2, and the p formed of InAsSb - Type of light absorbing layer 3 .
[0030] Between the semiconductor substrate 2 and the light-absorbing layer 3, there is formed a p layer composed of AlGaSb having a larger energy band width than the light-absorbing layer 3 + Type hole region layer 4.
[0031] In addition, on the light absorbing layer 3, a p layer composed of AlGaSb is formed - Type hole region layer 5; on the hole region layer 5, a p layer composed of GaSb is formed - type of electron emission layer 6 .
[0032] On the electro...
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