Abstract
The X-ray photoacoustic absorption spectrum (Cu K-edge) of CuInSe 2 , which has a chalcopyrite structure and applications to solar cells, has been measured together with that of pure Cu metal as a reference, using synchrotron radiation. It is shown that the information derived from X-ray absorption near edge structure (XANES) is also included in the photoacoustic X-ray absorption spectrum which reflects heat generation processes in material. The first energy peak value in the XANES region in CuInSe 2 shifts to lower energy than that of pure Cu metal, indicating a chemical shift in CuInSe 2 .
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