Abstract

Two different ordered phases of CuInSe2 have been investigated by transmission electron microscopy (TEM) methods: the so‐called ‘‘ordered vacancy compound,’’ found in Cu‐poor material, and a new structure, CuPt‐ordered material, which has been found only in Cu‐rich material so far. Both phases may have a strong influence on the performance of solar cells—the ordered vacancy compound by forming the actual heterointerface in a solar cell—the CuPt‐ordered material through effects on the band structure of the material. Here, we present first TEM experiments to identify the ‘‘ordered vacancy compound,’’ and we show the existence of the CuPt‐ordered phase.

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