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Light sensing material

  1. Jun 12, 2013 #1
    Are there any easy to obtain and fast responding photoresistors out there ? The resistance of material must decrease when light in shining on it, and the response must be fast.

    Note: I know that photodiodes respond extremely fast but they must be used coupled with a transistor to amplify the detection. Also photodiodes response is not decrease in resistance but generation of voltage.

    I use a cheap CdS photoresistors but they are too slow, especially when going from light to dark.
  2. jcsd
  3. Jun 12, 2013 #2
    Oh and response must be huge. CdS photoresistors, although slow responding, change their resistance from almost infinity to almost zero. I mean what's the mean if material changes resistance from say 1000 ohm to 800 ohm or something like that.
  4. Jun 14, 2013 #3
    does anybody have experience with POLYVINYLCARBAZOLE ?
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