Question

how crystal defects influences its mechanical, electrical and optical behaviour

Answer 1

Answer on Question #61790, Physics / Solid State Physics

how crystal defects influences its mechanical, electrical and optical behaviour

**Solution:**

- Mechanical behaviour

- Defects in crystals reduce its strength.

- Ways to improve strength:

1. reduce the number of defects (e.g., single crystals);

2. obstruct the movement of defects

- Electrical behaviour

- The presence of defects (donor or acceptor) significantly increases the electrical conductivity of semiconductors. Limit: one atom of defects at 10,000 atoms of basic substance.

- Optical behaviour

- Luminescence can be observed in semiconductor crystal with special additives (activators).