Why don't photoresistors made of Si obey Lambert's cosine law? Is it related to the dark current of the photoresistor? I couldn't find any solution while searching the web.

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    $\begingroup$ Address this rather to Physics SE (particularly solid state/phase physics). The fact chemistry deals with various compounds and their electrons does not mean anything related to that is addressed by chemistry. // Aside of that and generally, be aware that laconic, not elaborated questions (describe well, search, think, refer, summarize) are usually closed on the StackExchange network. $\endgroup$
    – Poutnik
    Jan 25, 2022 at 10:47
  • $\begingroup$ I wouldn't agree this is off-topic for Chemistry.SE. Besides, Physics.SE already have unanswered Why do some materials follow Lambert's cosine law? and the info on the underlying principles indeed seems to be scarce. I do agree though that the question is too laconic. A reference, an example of such material, or elaboration on the expected chemical effect on radiometry would improve the question. $\endgroup$
    – andselisk
    Jan 25, 2022 at 11:51
  • $\begingroup$ @andselisk I have commented rather in sense Physics SE may be better, but have not checked the site for this. I do agree the solid state matter is a cross-discipline between both, but considering the Q asks rather about physical aspects. $\endgroup$
    – Poutnik
    Jan 25, 2022 at 12:44
  • $\begingroup$ Not sure if there are Si photoresistors. They are usually metal sulphides/selenides. $\endgroup$
    – Poutnik
    Jan 25, 2022 at 15:26
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    $\begingroup$ Why is the material being silicon important for this question? Is it claimed somewhere that silicon photoresistors are special in their reflection directivity pattern? $\endgroup$
    – Ruslan
    Jan 26, 2022 at 10:27


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