Metal oxide semiconductor field effect transistors (MOSFETS) used in ink-jet head chips and method for making the same
DCFirst Claim
1. A metal oxide semiconductor field effect transistor (MOSFET) used in ink-jet head chips, which is connected to an inkjet actuator for controlling the electrical voltage or current passing through the inkjet actuator;
- the MOSFET comprising at least a source, a drain, and a gate and being characterized in that;
the MOSFET is covered with a borophosphosilicate glass (BPSG);
at least one contact hole through the BPSG is filled with a plug material at the position corresponding to the drain;
the gate length is between 0.35 μ
m and 3.5 μ
m, and the sum of junction depths at the source and the drain is 0.2 to 0.75 times that of the gate length.
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Accused Products
Abstract
A MOSFET and the method for fabricating them are disclosed to make the inkjet head chips. The MOSFET has the scaled-down junction formation for the source and drain. Using a lower temperature process and interlayer dielectric, the source and drain dopants can not be diffused deeply due to high-temperature driver-in. The contact holes of the drain are provided with plugs of refractory material to avoid spiking between the metal and silicon. This achieves the requirement of high-density devices on the print head chip.
10 Citations
12 Claims
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1. A metal oxide semiconductor field effect transistor (MOSFET) used in ink-jet head chips, which is connected to an inkjet actuator for controlling the electrical voltage or current passing through the inkjet actuator;
- the MOSFET comprising at least a source, a drain, and a gate and being characterized in that;
the MOSFET is covered with a borophosphosilicate glass (BPSG);
at least one contact hole through the BPSG is filled with a plug material at the position corresponding to the drain;
the gate length is between 0.35 μ
m and 3.5 μ
m, and the sum of junction depths at the source and the drain is 0.2 to 0.75 times that of the gate length. - View Dependent Claims (2, 3, 4, 5, 6)
- the MOSFET comprising at least a source, a drain, and a gate and being characterized in that;
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7. A chip structure of an integrated-driver ink-jet head, comprising:
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a plurality of MOSFETs, which contains at least one gate, a source, and a drain, wherein the MOSFET is covered with a borophosphosilicate glass (BPSG);
at least one contact hole through the BPSG is filled with a plug material at the position corresponding to the drain;
the gate length is between 0.35 μ
m and 3.51 μ
m, and the sum of junction depths at the source and the drain is 0.2 to 0.75 times that of the gate length;
a plurality of actuators, which are in electrical communications with the MOSFETs for providing the energy to eject fluid out; and
a plurality of fluid-flow structures, which define at least one fluid-flow channel on an fluid-chamber and a nozzle for the fluid to refill and are in communications with said actuators to eject fluid out. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification