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(a) The schematic illustration of the WO3−x/Si n-n homotype heterojunction. (b) The I-V curve of a typical WO3−x/Si n-n homotype heterojunction in dark at room temperature, inset shows the semi-logarithmic I-V curve. (c) The time response under various light signals at −5 V bias. (d) The time responses at −5 V bias under pulsed 405 nm light illumination with different light intensities. Reproduced or adapted from [39].
