solar cells
Question:

How does a solar cell turn sunlight into electricity?

2 People tried to answer this question

n-type silicon and p –type came into contact -->sunlight hits the N-type silicone -->electrons have extra energy and they are free to move-->electrons move from the N-type to the P-type -->holes move from the P-type to the N-type -->electric field will be created -->electrons move to the positive electrode of the resistor and the holes move to the negative electrode -->the system will start to work.

n-type silicon and p –type came into contact --> electrons move from the N-type to the P-type -->holes move from the P-type to the N-type -->electric field will be created->sunlight hits the N-type silicone -->electrons have extra energy and they are free to move -->electrons move to the positive electrode of the resistor and the holes move to the negative electrode -->the system will start to work.

n-type silicon and p –type came into contact -->electrons move from the P-type to the N-type -->holes move from the P-type to the N-type -->electric field will be created -->sunlight hits the N-type silicone -->electrons have extra energy and they are free to move-->electrons move to the positive electrode of the resistor and the holes move to the negative electrode --> the system will start to work.

n-type silicon and p –type came into contact -->electrons move from the N-type to the P-type -->holes move from the P-type to the N-type -->electric field will be created -->sunlight hits the N-type silicone -->electrons have extra energy and they are free to move-->electrons move to the negative electrode of the resistor and the holes move to the positive electrode -->the system will start to work.

correct ansewr 

electrons move from the N-type to the P- type , the holes move from the P-type to the n-type.

electrons move to the negative electrode (not to the positive ) , holes move to the negative electrode not to positive .

the electric fieled created before the sunlight hits the N-type silicone .



Comments:
1.  Jakoel Sara (02.07.2017 pm 07.50.11)
Peer assessment - Solar cells

Hello Eman,

I really enjoyed reading your question. The explanation was clear and almost scientifically accurate.  The combination with animation made it more interesting and could wake up pupil curiosity.

In my opinion, you have chosen a very interesting topic for your question and these are the reasons:

  1. Solar energy is created from an infinite, not polluting  and free source.
  2. Solar energy is green energy, in contrast to oil, gas or coil energy.
  3. Solar cells are a very interesting application of semiconductor usage.

I think it might be worthy to add a small introduction at the beginning of the question about solar energy and its advantages as green energy compared to other energy sources.

You can give a well-known example of solar energy application like calculators.  It might be nice also, to show a solar panel as presented in the following picture and mention that in this panel there are some thousands of solar cells.

Credit:www.physics.org

About the multi choice question I think that the alternatives could be written with shorter sentences, to make them easier to understand. For example :

  1. Photons create electron-hole pairs inside the p-n junction which move according to junction electric field.
  2. Photons create  electron-hole pairs in p-type part which move according to junction electric field.
  3. Photons creates electron-hole pairs in n-type side which move according to junction electric field.
  4. Photons recombine electron-hole pairs everywhere in the solar cell and create an electric flow.

The question was not developed as a multimedia question in AugmentedWorld and as a result feedbacks for  the answer and the distractors are missing.

Thanks, Sara.



History of edits
Edited BY: Eman Khamaisi Edit Date: 2017-07-01 16:47:10
Created By: Eman Khamaisi Edit Date: 2017-05-25 12:48:12
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