摘要:
The specification discloses a low-temperature process for depositing a layer of a conductive oxide of a chosen metal, such as tin oxide, on the surface of a substrate while simultaneously avoiding damage to the substrate. The process comprises exposing the substrate to a selected vapor phase reactant containing the chosen metal, such as tetramethyl tin, in the presence of neutral, charge-free oxygen atoms formed in a manner which avoids the generation of charged particles and high energy radiation that would damage the substrate. The oxygen atoms react with the vapor phase reactant to form the conductive oxide, which deposits as a layer on the surface of the substrate. In a preferred process embodiment, the neutral oxygen atoms are photochemically generated. This process is especially useful for depositing a layer of a transparent conductive oxide on the surface of a radiation-hardened device while maintaining the radiation-hardness of the device.
摘要:
The resistance to radiation damage of an n.sup.+ p boron doped silicon solar cell is improved by lithium counterdoping. Even though lithium is an n-dopant in silicon, the lithium is introduced in small enough quantities so that the cell base remains p-type.The lithium is introduced into the solar cell wafer 10 by implantation of lithium ions whose energy is about 50 keV. After this lithium implantation, the wafer is annealed in a nitrogen atmosphere at 375.degree. C. for two hours.
摘要:
A controlled quantity of a liquid polyimide precursor compound is deposited on the active surface of an integrated circuit die which has been prepared for packaging, and thereafter cured using a two step curing process to develop a polyimide coating of sufficient thickness to provide alpha particle protection for the die once packaged.
摘要:
A structure is provided which affords radiation protection to semiconductor devices and which specifically prevents soft failures in semiconductor memories caused by alpha particle radiation. The protection is provided by a metallic radiation shield formed on but insulated from the semiconductor memory array. The radiation shield is formed on the semiconductor devices while they are still in wafer form but after the normal device fabrication has been completed.
摘要:
Alpha-particle induced errors in integrated circuits, especially those used for memory storage, are reduced by subjecting the partially completed, or fully completed, integrated circuits to neutron irradiation. This irradiation creates "traps" in the single crystalline semiconductor substrates of the integrated circuits for any unwanted charged particles that are produced by alpha particle radiation. Consequently, such unwanted charged particles do not disrupt the integrity of any data stored in the circuit. In one embodiment, the neutron irradiation is applied during wafer fabrication and, in a second embodiment, the irradiation is applied after wafer fabrication but before packaging of the circuit, and in the third embodiment the irradiation is applied after a completion of the packaging step of the integrated circuits.
摘要:
A hermetic cap member of a casing for a semiconductor memory element is provided with a protection layer on a recessed surface facing the memory element. The protection layer is of at least one material which does not emit alpha particles and has a thickness sufficient to prevent alpha particles from being emitted from the cap member onto the memory element. Specifically, the protection layer may be a plate of a pertinent one of the following silicon of high purity, 42 alloy, or Kovar and is attached to the cap member by the use of an adhesive of glass frit. Alternatively, the protection layer may be made from a metallic paste of silver, silver-palladium, or gold-palladium by firing the same onto the cap member. The protection layer may also be magnesium oxide formed by the use of a plasma spray process. As a further alternative, the protection layer may consist of a plurality of materials.
摘要:
Integrated circuits in dice on a wafer are qualified by providing two sets of conductors connected to each die by fusible elements, biasing the dice using said conductors during exposure to a qualifying environment, testing the fusible elements, removing the conductors and testing the circuits. Where the environment is gamma radiation, the fusible elements are tested before annealing of radiation damage and the circuits are tested before and after annealing.
摘要:
A structure and method for preventing minority carriers caused by an alpha particle, or the like, from drifting into storage regions and causing a false data bit. In a high density MOS circuit, a single alpha particle including one originating within the substrate or circuit package can generate enough carriers to give a false data bit. A minority carrier reflective barrier is employed to prevent substantial numbers of minority carriers from drifting into the active layer. In the presently preferred embodiment, this barrier is formed by ion implanting the upper surface of the substrate.
摘要:
In one embodiment, a semiconductor device, such as an insulated-gate-field-effect-transistor (IGFET), is simultaneously radiation hardened with Al ions and its threshold voltage stabilized with halide ions, such as Cl ions, by bombarding a silicon dioxide gate insulator of the device with molecular ions of an aluminum halide, such as AlCl.sub.2 .sup.+ ions. In another embodiment, a surface (target) of silicon is bombarded with molecular AlCl.sub.2 .sup.+ ions to ion implant separate Al ions and Cl ions. There, an oxide layer subsequently thermally grown on the bombarded surface includes the Al ions and the Cl ions, and the oxide layer is radiation hardened and gettered.
摘要:
A total ionizing dose suppression architecture for a transistor and a transistor circuit uses an “end cap” metal structure that is connected to the lowest potential voltage to overcome the tendency of negative charge buildup during exposure to ionizing radiation. The suppression architecture uses the field established by coupling the metal structure to the lowest potential voltage to steer the charge away from the critical field (inter-device) and keeps non-local charge from migrating to the “birds-beak” region of the transistor, preventing further charge buildup. The “end cap” structure seals off the “birds-beak” region and isolates the critical area. The critical area charge is source starved of an outside charge. Outside charge migrating close to the induced field is repelled away from the critical region. The architecture is further extended to suppress leakage current between adjacent wells biased to differential potentials.