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A metalorganic selenide, diethylselenide [(C 2 H 5 ) 2 Se: DESe], was used as a less-hazardous selenization source for the preparation of CuInGaSe 2 alloy films for solar cell application. Purely single-phase, polycrystalline films of CuInGaSe 2 were formed without additional annealing process. Photoluminescence spectra of the films at low temperature were dominated by three donor-acceptor pair emissions peculiar to the films used for a photo-absorbing layer of state-of-the-art CuInGaSe 2 -based solar cells.

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