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List of Symbols and Abbreviations ........................................ 3
1.1 Introduction ...................................................... 4
1.2 Historical Background ............................................. 4
1.3 Purification ...................................................... 7
1.3.1 General Purification Procedures .................................... 7
1.3.2 Zone Refining and Related Techniques ............................... 8
1.3.3 Problems with Specific Compounds ................................. 8
1.3.3.1 InSb and GaSb ................................................... 9
1.3.3.2 InAs and GaAs ................................................... 10
1.3.3.3 InP and GaP ..................................................... 10
1.3.3.4 I1 - VI Compounds ................................................ 10
1.4 Technical Constraints to Melt Growth Techniques ...................... 11
1.4.1 Chemical Reactivity ............................................... 12
1.4.2 Melting Point .................................................... 13
1.4.3 Vapor Pressure ................................................... 13
1.5 Crystal Growth ................................................... 13
1.5.1 Horizontal Growth ............................................... 14
1.5.2 Vertical Growth .................................................. 16
1.5.3 Crystal Pulling ................................................... 18
1 S.4 Liquid Encapsulated Czochralski (LEC) Pulling ....................... 20
1.5.4.1 The Low Pressure LEC Technique .................................. 20
1.5.4.2 The High Pressure LEC Technique .................................. 20
1.6 Crystal Growth of Specific Compounds ............................... 21
1.6.1 InSb ............................................................ 22
1.6.2 InAs and GaAs ................................................... 22
1.6.3 InP ............................................................. 24
1.6.4 11-VI Compounds: General ........................................ 26
1.6.4.1 Bulk Hg, -,Cd, Te ................................................ 26
1 ~j.4.2 CdTe and Cd, -,Zn, Te ............................................ 27
1.6.4.3 ZnSe ............................................................ 28
1.6.4.4 ZnS and CdS ..................................................... 28
1.7 Fundamental Aspects of Crystal Growth .............................. 29
1.7.1 Structure ........................................................ 30
1.7.2 Temperature Distribution, Crystal Shape and Diameter Control ......... 30
1.7.3 Solute Distribution ................................................ 33
1.7.4 Constitutional Supercooling ........................................ 34
1.7.5 Facet Effect. Anisotropic Segregation and Twinning .................... 36
1.7.6 Dislocations and Grain Boundaries .................................. 39
1.8 Wafering and Slice Preparation ....... : .............................. 40
1.9 References ....................................................... 41 |
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