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Given the below diagram, absorption spectrum

The text further reads why Germanium is better choice in solar cells

And the next paragraph says

PbS ..(ref figure)

Radiation will be absorbed on top layer and would not reach the depletion region

what is the meaning of this part intensity absorbed

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  • $\begingroup$ Sorry let me edit that,*done please see and help me if possible. $\endgroup$ Commented Mar 23, 2017 at 18:54
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    $\begingroup$ And what is your question? $\endgroup$
    – Jon Custer
    Commented Mar 23, 2017 at 19:00
  • $\begingroup$ I cannot understand the last paragraph **Radiation will be absorbed on top layer and would not reach the depletion region ** $\endgroup$ Commented Mar 23, 2017 at 19:01
  • $\begingroup$ Wavelengths well above band gap are strongly absorbed. Since there must be a layer above the depletion layer, you don't want it to absorb strongly. $\endgroup$
    – Jon Custer
    Commented Mar 24, 2017 at 1:05

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