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Usually, single-crystal material has a longer carrier diffusion length due tofewer defects. Here, we report a nano/amorphous copper oxide and selenium (COS)composite film prepared by radio frequency magnetron co-sputtering of CuO andSe and post annealing. The photo-generated carriers in the COS film can diffusevery far (3.147 mm). Additionally, the COS film can strongly absorb light overthe entire solar spectrum region (250-2500 nm) (average absorptance is ~80%).These results indicate that the COS composite is an excellent material and canbe used in solar cells and other photo-electric devices.

More than 3-mm-long carrier diffusion and strong absorption over the full solar spectrum in copper oxide and selenium composite film