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Graded affinity photovoltaic cell

  • US 4,542,256 A
  • Filed: 04/27/1984
  • Issued: 09/17/1985
  • Est. Priority Date: 04/27/1984
  • Status: Expired due to Term
First Claim
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1. An improved photovoltaic cell comprising at least a front electrically conductive layer upon which radiation is incident and a back electrically conductive layer, between which is sandwiched a primary light-absorbing layer of substantially intrinsic amorphous semiconducting material displaying low photogenerated carrier mobility below about 50 cm2 /Voltsecond, the constitution of said primary light-absorbing layer being fabricated to provide an affinity gradient at one end of said primary light-absorbing layer adjacent one of said front and back electrically conductive layers for reducing back diffusion of a preselected species of photogenerated carrier chosen from electrons and holes to thereby reduce non-productive recombination with carriers of opposite type.

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