# In an unbiased p-n junction, holes diffuse from the p-region to n-region because ______. - Physics

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In an unbiased p-n junction, holes diffuse from the p-region to n-region because ______.

#### Options

• free electrons in the n-region attract them.

• they move across the junction by the potential difference.

• hole concentration in p-region is more as compared to n-region.

• All the above.

#### Solution

Hole concentration in p-region is more as compared to n-region.

Explanation:

The diffusion of charge carriers across a junction takes place from the region of higher concentration to the region of lower concentration. In this case, the p-region has a greater concentration of holes than the n-region. Hence, in an unbiased p-n junction, holes diffuse from the p-region to the n-region.

Concept: p-n Junction
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Chapter 14: Semiconductor Electronics: Materials, Devices and Simple Circuits - Exercise [Page 497]

#### APPEARS IN

NCERT Physics Class 12
Chapter 14 Semiconductor Electronics: Materials, Devices and Simple Circuits
Exercise | Q 14.4 | Page 497
NCERT Physics Class 12
Chapter 14 Semiconductor Electronics: Materials, Devices and Simple Circuits
Exercise | Q 4 | Page 509
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