Solar cell
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United States of America Patent
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Aug 12, 2014
Grant Date -
Apr 1, 2010
app pub date -
Sep 24, 2009
filing date -
Sep 26, 2008
priority date (Note) -
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Abstract
A solar cell includes a p-n junction formed by joining a p-type semiconductor and an n-type semiconductor. The p-type semiconductor is a chalcopyrite compound semiconductor with a band gap of 1.5 eV or more within which an intermediate level exists with a half bandwidth of 0.05 eV or more. The intermediate level is different from an impurity level. The chalcopyrite compound semiconductor includes a first element having first electronegativity of 1.9 or more in Pauling units, the first element occupying a lattice site of the semiconductor. A portion of the first element is substituted with a second element having second electronegativity different from the first electronegativity, the second element being a congeneric element of the first element. The intermediate level is created by substituting the first element with the second element.
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