why Pbs (Eg= 0.4eV) is not used for fabricating solar cell.?
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materials like PbS (where band gap is 0.4 eV) which have band gaps less than 1.5 eV - are not as frequently used in solar cells as Si, or GaAs, because in solar cells made of PbS, where incident photons' energy is a lot higher than the band gap, most of the photons incident are absorbed by the top layer of the cell and do not reach the junction (electron-hole separation, of course, needs to occur in the depletion region).
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