Process for gettering semiconductor components and integrated semiconductor circuits
AssigneeSiemens Aktiengesellschaft
InventorHartmut Runge
Life of this patent
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Abstract
Semiconductor components and integrated semiconductor circuits which are produced in a semiconductor crystal wafer are provided with a getter layer on the back side (opposite the active device side) of a semiconductor crystal wafer by controllably irradiating such back side with laser light pulses.
Claims7
In a process for gettering semiconductor components and integrated semiconductor circuits whose structures are produced in monocrystalline semiconductor material wafers wherein gettering areas are provided on a back side of such wafer, the improvement comprising:
- controllably irradiating select areas of a back side of a monocrystalline semiconductor material wafer with laser light pulses so as to produce dislocation networks in the irradiated areas, said laser irradiation being controlled in such a manner that at least two laser pulses are irradiated onto said select areas of the wafer, a first laser pulse being of sufficient energy to evaporate a relatively thin layer of material from the irradiated areas and a second laser pulse being of sufficient energy to produce dislocation networks in the irradiated areas, said first laser pulse having an energy level which is higher by a factor of 2 than that of said second layer pulse.
A process for producing a gettering layer on semiconductor components and on integrated semiconductor circuits whose structures are produced in monocrystalline semiconductor material wafers comprising:
- controllably irradiating a back surface of such wafers with a first laser light pulse having sufficient energy to evaporate a relatively thin layer of material from said surface so as to produce a fresh surface;
- and
- controllably irradiating the fresh surface of such wafer with a second laser light pulse having sufficient energy to produce a relatively thin layer of dislocation network, said first laser light pulse having an energy density which is higher by a factor of about 2 than the energy density of said second laser light pulse.
Dependencies are inferred from the claim text.