Semiconductor device having a transparent switching element

Active solid-state devices (e.g. – transistors – solid-state diode – Combined with electrical contact or lead – Of specified material other than unalloyed aluminum

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257 59, 257 66, 257 72, H01L 2904, H01L 2976, H01L 2348

Patent

active

057448647

ABSTRACT:
A semiconductor device includes a transparent switching element (1) with two connection electrodes (2, 3) of a transparent material and an interposed transparent channel region (4) of a semiconductor material provided with a transparent gate electrode (5) of a conductive material, separated from the channel region (4) by a transparent insulating layer (6). The semiconductor material is a degenerate semiconductor material with a basic material having a bandgap (10) between conduction band (11) and valence band (12) of electrons greater than 2.5 eV and a mobility of charge carriers greater than 10 cm.sup.2 /Vs provided with dopant atoms which form a fixed impurity energy level (13) adjacent or in the valence band (12) or conduction band (11) of the basic material. The degenerate semiconductor material is transparent because the absorption of visible light is not possible owing to the great bandgap (10), while also no absorption of visible light takes place through the impurity energy levels (13). The device is capable of comparatively fast switching.

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patent: 4900370 (1990-02-01), Itoga et al.
patent: 5229644 (1993-07-01), Wakai et al.
patent: 5397920 (1995-03-01), Tran
patent: 5619044 (1997-04-01), Makita et al.

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