Active solid-state devices (e.g. – transistors – solid-state diode – Integrated circuit structure with electrically isolated... – Passive components in ics
Patent
1995-08-24
1998-08-11
Loke, Steven H.
Active solid-state devices (e.g., transistors, solid-state diode
Integrated circuit structure with electrically isolated...
Passive components in ics
257381, 257756, H01L 2900, H01L 2976, H01L 2348
Patent
active
057930970
ABSTRACT:
The present invention provides a polycrystalline silicon conducting structure (e.g., a resistor) whose resistance value is controlled, and can be less variable and less dependent on temperature with respect to any resistant value, and a process of producing the same. Use is made of at least a two-layer structure including a first polycrystalline silicon layer of large crystal grain size and a second polycrystalline silicon layer of small crystal grain size, and the first polycrystalline silicon layer has a positive temperature dependence of resistance while the second polycrystalline layer has a negative temperature dependence of resistance, or vice versa. Moreover, the polycrystalline silicon layer of large grain size can be formed by high dose ion implantation and annealing, or by depositing the layers by chemical vapor deposition at different temperatures so as to form large-grain and small-grain layers.
Ikeda Takahide
Kikuchi Toshiyuki
Kobayashi Takashi
Ohnishi Kazuhiro
Shiba Takeo
Hitachi , Ltd.
Hitachi Device Engineering Company, Ltd.
Loke Steven H.
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