摘要:
A silicon crystal body having a major surface lying parallel to a {110} or {100} crystal plane is prepared. A silicon oxide film is formed on the major surface by heating the body in an atmosphere containing steam. Then, an aluminum layer is formed on the oxide film. Thereby the amount of surface donors induced in the major surface of the body by the existence of the oxide film is smaller than the amount of induced surface donors to be obtained in a crystal plane of a like silicon body but lying parallel to a {111} plane covered with a like oxide film. The amount of induced surface donors is further reduced by subjecting said body to a heat treatment under application across said oxide film of such a voltage as that which renders the aluminum layer provided on the oxide film negative polarity. This invention is applied to the manufacture of, for example, MOS field effect transistors, MOS diodes and so-called planar transistors.
摘要:
According to the present invention, a tape carrier is prepared which comprises a power trunk line including an electric connection as a branch of a power lead for each tape carrier unit and a ground trunk line having an electric connection as a branch of a ground lead for each tape carrier unit, the power and trunk lines being continuously formed along the longitudinal direction of the tape carrier, and a lead for a control signal for establishing an electric conduction along the longitudinal direction of the tape carrier via an aging wiring for semiconductor pellets to conduct a simultaneous multipoint (gang) bonding on the tape carrier, the control signal lead being formed on the tape carrier. By mounting the semiconductor pellets having the aging wiring on the tape carrier, it is enabled to apply the power voltage and to supply the control signal to each of the plurality of the semiconductor pellets, and hence the operation test can be simultaneously conducted for the semiconductor pellets mounted on the tape carrier having an arbitrary length. This provision enables a plurality of semiconductor devices mounted on the tape carrier to be subjected to an aging, namely, a reliability test under a thermal environment and in the operating state, and hence an efficient reliability test can be achieved with an effect of the mass production. Consequently, a highly reliable semiconductor device can be provided.
摘要:
According to the present invention, a tape carrier is prepared which comprises a power trunk line including an electric connection as a branch of a power lead for each tape carrier unit and a ground trunk line having an electric connection as a branch of a ground lead for each tape carrier unit, the power and trunk lines being continuously formed along the longitudinal direction of the tape carrier, and a lead for a control signal for establishing an electric conduction along the longitudinal direction of the tape carrier via an aging wiring for semiconductor pellets to conduct a simultaneous multipoint (gang) bonding on the tape carrier. By mounting the semiconductor pellets having the aging wiring on the tape carrier, it is enabled to apply the power voltage and to supply the control signal to each of the plurality of the semiconductor pellets, and hence the operation test can be simultaneously conducted for the semiconductor pellets mounted on the tape carrier having an arbitrary length. This provision enables a plurality of semiconductor devices mounted on the tape carrier to be subjected to an aging, namely, a reliability test under a thermal environment and in the operating state, and hence an efficient reliability test can be achieved with an effect of the mass production. Consequently, a highly reliable semiconductor device can be provided.