Non-mass-analyzed ion implantation
First Claim
1. A non-mass-analyzed ion implantation process using ions generated from a compound without selecting a single ion species, comprising the steps of:
- generating ions, which include at least two species of ions of the same polarity, from a compound source material;
accelerating said ions;
scanning said accelerated ions electromagnetically and repetitively in a direction transverse to an acceleration direction; and
implanting beams of said scanned ions, including said at least two species of ions, into a target, with said at least two species of ions being implanted with different distribution profiles of implanted ion doses.
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Abstract
A non-mass-analyzed ion implantation process wherein two or more species of ions of the same polarity having greatly different ion masses are generated from a compound source material, the ions are accelerated under the application of an electric field, and the accelerated ions are scanned under the application of a magnetic field so as to be implanted into a target at a distribution profile which varies with the species of ions. An ion implantation apparatus can be simplified. A large ion beam current with a large spot size can be used and ions can be implanted to the target at a large dose within a short time. Especially, the non-mass-analyzed ion implantation is advantageously utilized for production of solar batteries.
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Citations
19 Claims
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1. A non-mass-analyzed ion implantation process using ions generated from a compound without selecting a single ion species, comprising the steps of:
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generating ions, which include at least two species of ions of the same polarity, from a compound source material; accelerating said ions; scanning said accelerated ions electromagnetically and repetitively in a direction transverse to an acceleration direction; and implanting beams of said scanned ions, including said at least two species of ions, into a target, with said at least two species of ions being implanted with different distribution profiles of implanted ion doses. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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- 17. A method of producing a semiconductor device wherein one conductivity affording impurity is doped into a semiconductor substrate by non-mass-analyzed ion implantation, a discharge gas of a hydrogen compound of the impurity is used to generate ion beams which include at least H+ ion and ion of said impurity, and the generated ion beams including at least H+ ion and ion of said impurity are scanned by a magnetic field to cause superposed and different scanning spans for the H+ ion and ion of said impurity and reduce the dose of H+ relative to the dose of ion of the impurity.
Specification