3 results about "Thermionic emission" patented technology

A dielectric layer of a semiconductor device may be treated using an oxidation treatment process to tune the dielectric constant of the dielectric layer. For example, an etch stop layer (ESL) in an interconnect layer of the semiconductor device may be formed of a high dielectric constant (high-k) dielectric material, which provides etch selectivity for the ESL relative to other dielectric layers in the interconnect layer. A recess may be formed through the ESL and through the dielectric layers, and a conductive structure may be formed in the recess. Prior to formation of the conductive structure, an oxidation treatment operation may be performed to oxidize the exposed ends of the ESL in the recess. The oxidation treatment may lower the dielectric constant of the ends of the ESL, which may result in the ends of the ESL being less susceptible to current leakage through tunneling, hot-carrier injection, and / or thermionic emission.

The application provides a working medium-free micro thermionic emission device, which comprises an extraction electrode, an electron emitter, a heating assembly, a shielding cover, an insulating connecting piece and a supporting cylinder; the extraction electrode is arranged outside the supporting cylinder, and the electron emitter and the heating assembly are arranged inside the supporting cylinder; the heating assembly is used for heating the electron emitter so that the electron emitter emits a thermionic emission current; the central axis of the electron emitter corresponds to an extraction hole on the extraction electrode; a gap exists between the emission end face of the electron emitter and the extraction electrode; the two ends of the insulating connecting piece are connected with the outer side wall of the supporting cylinder and the inner side wall of the extraction electrode respectively; the shielding cover is arranged on the circumferential side of the supporting cylinder, and a gap exists between the shielding cover and the supporting cylinder. The electron emission device of the application can be used as an electron source for a tether propulsion system, and can greatly improve the performance of the propulsion system, simplify the system structure, reduce the weight and complete space tasks such as orbit transfer of a spacecraft or de-orbiting at the end of the life of the spacecraft.

The utility model discloses a heat dissipation formula X ray tube, it includes glass shell, glass shell one end is provided with cathode assembly, glass shell one end is provided with anode assembly, and cathode assembly generates free electron through thermionic emission process, and anode assembly absorbs free electron and generates X ray, and glass shell outside fixedly connected with metal protective housing, and the metal protective housing bottom is provided with the through slot, and the electromagnetic coil is activated and produces the rotation magnetic field and gives birth to permanent magnet and drives target block rotation, and the electron that tungsten wire emits spreads to the larger area, and the heat capacity of X ray tube is increased significantly, and the insulating oil carries out heat exchange first during tungsten wire heating process, and simultaneously, the anode tube drives second bevel gear rotation, and the cooperation of second bevel gear and first bevel gear drives second pulley rotation, and under the action of transmission belt, the fan blade produces the downward airflow, and the airflow is discharged from the air outlet and carries out the cooling of insulating oil, and the inclined plane air deflector changes the wind direction, prevents the hot airflow and directly blows to the X ray irradiation place.