Working principle of the photodiode and photoresistor

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SUMMARY

The discussion clarifies the fundamental differences between photodiodes and photoresistors. A photoresistor operates on the principle of photoconductivity, altering its resistance in response to light. In contrast, a photodiode functions based on the principle of photovoltaic effect, changing the current flowing through it when exposed to light. Understanding these principles is crucial for differentiating the applications and behaviors of these two light-sensitive components.

PREREQUISITES
  • Understanding of photoconductivity and its applications
  • Knowledge of the photovoltaic effect and its implications
  • Familiarity with electronic components and their functions
  • Basic principles of current and resistance in circuits
NEXT STEPS
  • Research the photovoltaic effect in detail and its applications in solar cells
  • Explore the characteristics and applications of photoresistors in light sensing
  • Learn about the different types of photodiodes and their specific uses
  • Investigate circuit design involving photodiodes and photoresistors for practical applications
USEFUL FOR

Electronics enthusiasts, engineers, and students seeking to understand the operational principles of light-sensitive components like photodiodes and photoresistors.

akzo
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Hello everyone. I feel myself a little bit confused because I can't understand the difference between the working principle of the photodiode and the photoresistor. The photoresistor changes its resistance under the influence of light while photodiode changes the current across iself. Is this right? I also know that photoresistor use the principle called photoconductivity, but what principle is used by photodiode then? I guess there should be some difference, because why we are talking about resistance in one case and about current in another?

Thanks in advance.
 
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Hi akzo! Does a google search lead you to finding out the basics of a photodiode?
 
Yes It did but I am still confused. I need to find the name of the working principle that lays in the basis of the photodiode, and I guess if I found the answer in google I wouldn't ask the question here.
 
akzo said:
Yes It did but I am still confused. I need to find the name of the working principle that lays in the basis of the photodiode, and I guess if I found the answer in google I wouldn't ask the question here.

how about typing in... How does a photodiode work ? into google
I got 100's of hits with various descriptions
 

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