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The adsorption of O2/H2O molecules on the ZnO nanowire (NW) surface results in the long lifetime of photo-generated carriers and thus benefits ZnO NW-based ultraviolet photodetectors by suppressing the dark current and improving the photocurrent gain, but the slow adsorption process also leads to slow detector response time.Here we show that a thermally evaporated copper phthalocyanine (CuPc) film is effective in passivating surface trap states ofZnO NWs.