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Tuesday 23 July 2013

PPT ON CRYSTAL STRUCTURE


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Crystal Structure  Presentation Transcript
1.Crystal Structure and Polysilicon Preparation
2.Raw material - silicon Silicon wafers are required for IC manufacturing, These should meet certain specifications, Silicon ingots are needed to produce these wafers, How these ingots are produced? How silicon is produced to manufacture these ingots? What is the desired structure of the silicon?
3.Structures of Solid Materials
4.Crystal Structure A crystal structure is a unique arrangement of atoms in a crystal. Lattice is an array of points repeating periodically in three dimensions. The points can be thought of as forming identical tiny boxes, called unit cells, that fill the space of the lattice. The lengths of the edges of a unit cell and the angles between them are called the lattice parameters.
5.Miller Indices Miller indices are a notation system in crystallography for planes and directions in crystal lattices.
6.Planes in crystals
7.Defects in Crystals What is a DEFECT? Any imperfaction in the crystal is called a defect Categories of defects: 4 types depending on their dimensionality Point Defect Dislocation (line defect) Area or Planar Defect Volume Defect
8.Simple defects in crystals
9.Point Defect
10.Dislocation
11.Area (Planar ) Defect When a defect is spread over an area it is called an ‘Area Defect’. Examples: Twin Boundary Grain Boundary
12.Volume Defect When a defect is spread over a volume it is called a ‘Volume Defect’ Example: Precipitates of impurity (dopants)
13.Charged Defects Vacancies ? may be charged also Charge interaction in a solid = chemical reactions in solutions, Concentration of vacancies ? determined by Mass-action relationships, Impurity conc. Gradient ? electric field in semiconductors Conc. Of neutral vacancies ? unaffected by this electric field. Hence, this conc. is same in extrinsic and intrinsic semiconductors
14.Conc. Of neutral vacancies ? fn of Temperature Conc. Of charged vacancies ? fn of Temp. and Impurity Conc. (due to E field) Hence Total Vacancy conc. ? fn of Impurity conc. Reactions involved: Vo + h+ ? V+ Vo + e- ? V- Vo + 2e- ? V2- Charged vacancies have self compensating effect on the semiconductor P-type material will have V+ which is donor- like N-type material will have V- which is acceptor-like
15.Solid Solubility Solid solubility is the conc. Of the impurity that the host lattice can accept in a solid solution of itself and impurity, Retrograde solubility: Solubility decreases with decreasing temp. Effect: Precipitation of impurity at lower temp. ? generation of volume defects
16.How? Maximum conc. At high temp Cool down the crystal, lower solid solubility at lower temp. So the solution is supersaturated To achieve equilibrium impurity atoms in excess of solid solubility (at lower temp.) are precipitated as a second phase. (silicides) Precipitates ? undesirable ? sites of dislocation generation,
17.Gettering What is Gettering? A process that removes harmful impurities or defects from the regions in a wafer where devices are fabricated, Advantages: Improvements in junction leakage current How it is done? Trapping sites are intentionally created to trap the harmful impurities so that they become immobile Bulk of the wafer does not participate in device functioning. Therefore traps are introduced on the back surface of the wafer,
18.Gettering Techniques Pre-Gettering: Gettering before device fabrication ? provides sinks that absorb impurities during device fab. Back surface damaging ? done intentionally Mechanically ? lapping, sand blasting By LASER beam Thermal Treatments at different temps.
19.Gettering Techniques Intrinsic Gettering: Oxygen present in the wafer is precipitated to provide trapping sites, High Temperature Cycle (>1050 o C in N2) to evaporate Oxygen from near the wafer surface, Thus supersaturation condition near the surface is avoided. A defect free zone is obtained for device fab. This zone is called Denuded Zone Low temperature treatment to precipitate oxygen in the bulk,
20.Gettering Techniques Metallic Gettering; A metal e.g. Nickel ? evaporated on the ack surface of wafer. Heat treatment for adhesion, Impurities e.g. gold having higher solubility in Nickel get trapped in it. Polysilicon Gettering: Deposit 1 micron thick polysilicon on the back surface Grain boundaries in poly act as traps for impurities
21.Purification of materials: Purpose: Chemically reduce the material – if it is an oxide, Convert it in a form (solid, liquid or gas) so that it can be separated from other materials, What is distillation? Why we do it? Fractional distillation?
22.What is MGS? Metallurgical processes are used to produce Silicon from its ore. SiO2 + C ? Si + 2 CO (reduction of oxide under heat and electric field) Result ? MGS What is EGS? Chemical purification of MGS Convert Si in a volatile compound to separate it from impurities Si + 3HCl ? SiHCl3 + H2 Convert TCS back into Si The resultant product is highly pure Si called EGS
23.Crude Silicon and its purification: Process Steps:
24.From Silicon to Trichlorosilane (TCS): * Purpose: * Process Steps:
25.From TCS to Electronic Grade Silicon (EGS): * Purpose: * Process Steps:
26.Crystal Growing Theory Every impurity has a solid solubility in Silicon and a different equilibrium solubility in the melt. Segregation Coefficient k0 = Cs / Cl Cs , Cl = equilibrium concentrations of the impurity in the solid and melt near the interface
27.Introduction to technologies Syllabus: Semiconductor Substrate-Crystal defects, Electronic Grade Silicon, Czochralski Growth, Float Zone Growth, Characterization & evaluation of Crystals; Wafer Preparation- Silicon Shaping, Etching and Polishing, Chemical cleaning.
28.Plan of Lecture Crystal Structure and Crystal Defects Preparation of polycrystalline silicon Crystal Growing Theory Preparation of single crystal silicon Wafer Preparation
29.Mono-crystal Silicon Growth Crystal Pulling CZ Method Floating Zone Method
30.Czochralski (CZ) crystal growth It involves the crystalline solidification of atoms from a liquid phase at an interface. The process consists of the following steps: A fused silica crucible is loaded with a charge of undoped EGS together with a precise amount of diluted silicon alloy. Evacuate the growth chamber. Back-fill with inert gas ? prevent atmospheric gases from entering the chamber.
31.Czochralski (CZ) crystal growth Heat Crucible to 1421o C to melt Silicon. Introduce seed crystal in molten silicon. Seed crystal is slim ( 5 mm dia) and 100 – 300 mm long with precise orientation The seed crystal is then withdrawn at a very controlled rate. The seed crystal and the crucible are rotated in opposite directions while this withdrawal process occurs.
32.Crystal Structure A crystal structure is a unique arrangement of atoms in a crystal. It is composed of motifs and a lattice. Motif is a set of atoms arranged in a particular way. Lattice is an array of points repeating periodically in three dimensions.
33.Crystal Structure (contd.) Motifs are located upon the points of a lattice. The points can be thought of as forming identical tiny boxes, called unit cells, that fill the space of the lattice. The lengths of the edges of a unit cell and the angles between them are called the lattice parameters.
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