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a Schematic illustration of the Cu/CuI/ZnO core/double-shell microwire PD; b I-V curves of Cu/CuI/ZnO PD under different compressive strains without illumination; c the enhanced output currents with the external strains, biased at 1.5 V; d I-V curves of Cu/CuI/ZnO core/double-shell microwire PD under different illumination power without external strain; e the photocurrents change with different light power, biased at 1.5 V
