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Crystal Growing Method

IP.com Disclosure Number: IPCOM000095194D
Original Publication Date: 1965-Oct-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Trapp, J: AUTHOR

Abstract

In this method, the crystal is pulled out of the melt by means of a seed, e.g., by the Czochralski method. Where single crystals are produced according to this method, seed crystals are used having a minimum diameter, i.e., smaller than the diameter of the crystal to be produced. This measure has the purpose of preventing thermal disturbances and reducing the over-all number of deficiencies at the boundary layer. In addition, the diameter of the crystal should be of a minimum dimension in the initial phase of the growth. This is in order to create favorable conditions for the deficiencies to grow out while the crystal is growing to the desired diameter.

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Crystal Growing Method

In this method, the crystal is pulled out of the melt by means of a seed, e.g., by the Czochralski method. Where single crystals are produced according to this method, seed crystals are used having a minimum diameter, i.e., smaller than the diameter of the crystal to be produced. This measure has the purpose of preventing thermal disturbances and reducing the over-all number of deficiencies at the boundary layer. In addition, the diameter of the crystal should be of a minimum dimension in the initial phase of the growth. This is in order to create favorable conditions for the deficiencies to grow out while the crystal is growing to the desired diameter.

In contrast, this different method uses a seed crystal already having the desired crystal diameter. This measure prevents in the phase of the pulling process while the diameter of the crystal is increasing to the desired value, twins and new seeds from forming on the edge of the crystal. Such would result in a polycrystalline structure of the crystal. This arises primarily with highly-doped melts and with melts which, due to the crucible material or the crucible shape, produce an unfavorable thermal profile of the melt. Moveover, the useless tip occurring in a pulling process employing a small seed is avoided.

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