What is Czochralski (CZ) method?
A method of making single-crystal silicon by dipping a seed crystal into molten silicon in a crucible and slowly pulling it up while rotating.
Field: Silicon wafers
Czochralski (CZ) method in the explanations
CZ silicon is melted in a quartz (SiO2) crucible, and oxygen dissolving from it enters the crystal at about 10¹⁸ cm⁻³.
Which impurity is incorporated in relatively large amounts …Oxygen in CZ wafers forms precipitates during heat treatment—bulk micro defects (BMDs).
What is the purpose of using bulk microdefects (BMDs), form…Magnetic CZ (MCZ) thereby reduces oxygen transport from the crucible into the crystal and suppresses temperature fluctuations and growth striations, improving uniformity.
Which method applies a magnetic field to the crucible in th…
Questions that mention Czochralski (CZ) method (24)
- Which impurity is incorporated in relatively large amounts from the crucible into silicon crystals grown by the CZ method?
- In the CZ method, what is the main purpose of controlling the ratio of pull rate to temperature gradient in the crystal (V/G)?
- Which impurity is typically added to the melt to make p-type silicon crystals by the CZ method?
- When a doped crystal is pulled by the CZ method, the dopant concentration tends to be higher toward the bottom of the crystal (later in the pull). Why?
- What is the purpose of using bulk microdefects (BMDs), formed by oxygen precipitation inside CZ wafers?
- Which method applies a magnetic field to the crucible in the CZ method to suppress melt convection and control oxygen concentration and other properties?
- What is the cylindrical block of single-crystal silicon grown by the CZ method or similar, before it is cut into wafers, called?
- In the CZ method, what is the purpose of growing a thin neck just after the seed crystal at the start of pulling (necking)?
- When finishing a CZ pull, why is the ingot diameter gradually reduced (a tail cone is formed) before separating it from the melt?
- Which is closest to the typical concentration of interstitial oxygen in silicon crystals grown by the CZ method?
- When CZ silicon is heat-treated around 450 °C, oxygen atoms can cluster and act as donors, changing the wafer's resistivity. What is this called?
- Compared with FZ silicon, how does the interstitial oxygen in CZ silicon affect the wafer's mechanical strength?
- Which is a known effect of adding a trace of nitrogen during CZ crystal growth (nitrogen doping)?
- In CZ crystals, what are the periodic, striped variations in dopant or oxygen concentration caused by fluctuations such as temperature at the growth interface called?
- Which method is most widely used to produce single-crystal silicon for LSIs?
Related terms
Ingot Gettering Oxygen precipitates (BMD) Segregation coefficient Necking Annealing Slip Donor Siemens process Spin coating