Thursday, April 12, 2012

How to make a solar cell using diodes

So the other day while i was studying about solar cells, i realized that a photovoltiac solar cell is very similar to a standard silicon diode, they are both p-n junctions, the only difference  being that a solar cell has a higher surface area. So i decided to use an 1N4148 standard small signal rectifier with an exposed die. I connected it to a Multimeter to check the voltage coming out of the diode. To my surprise, it worked! After concentrating the light to the diode with a magnifying glass, i was a able to get a usable voltage from the diode

Although i doubt that this would be more efficient than a standard photovoltiac cell, i believe that this might be useful in low cost applications
Please feel free to give any suggestions and improvements in the comments

Thank for watching!

EDIT: I got featured on!


  1. Hello,
    I got 21mV from an OA90 (Ge). Got more "power" from LED's
    See the experiment at: and

    Good luck!

  2. I´m getting more than 2v from LED´s, but is a low current. I, will post as soon a Buy a new voltimeter... :p someone has stolen it

  3. Solar cell! nice and interesting. I got one solar cell from for bets deal

  4. Your information is very nice. I have related information.... solar pv

  5. This post is very simple to read and appreciate without leaving any details out. Great work!
    solar panel uae