| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
|
|---|
| Outline of Final Research Achievements |
In order to contribute the mass-production of 450 mm diameter defect-free Si
crystals, the impact of thermal stresses on the intrinsic point defect behaviors was evaluated with first principles calculation. The accurate prediction of so-called Voronkov (v/G)crit with the calculated formation enthalpies and entropies of point defects showed that the calculated plane stress dependence is in excellent agreement with the published experimental values. The compressive thermal stresses around 20 MPa shift the Si crystal more vacancy-rich. Furthermore, the window for defect-free Si on the thermal stress was given. The computer simulator for intrinsic point defects and grown-in defects during Si crystal growth was developed.
|
