Consider the picture in Fig: 1. 1. hi which direction will the water droplets mo

Question

Consider the picture in Fig: 1. 1. hi which direction will the water droplets move, towards the air-water boundary or away from it? 2. In which direction will the air bubbles move, towards the air-water boundary or away from it? We can think of the electrons behaving as water chop lets. Since holes are missing electrons, they can be thought of as the bubbles i.e. missing water. Consider an electron in the depletion region of the p-n junction. 3. For the electron to lower its energy, which way would it move (left or right)? 4. Considering the hole is a missing electron, for the system to lower its energy which way will the hole move (left or light)?

Explanation / Answer

1) water droplets move towards the air-water boundary (direction downwards)

2) air bubbles also move dowards the air-water boundary (direction upwards)

3) the electron will move towards right

4) the hole will move towards left

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