Bipolar Photoresponse in p–n Heterojunction for Spectrally Distinctive Photodetection

We constructed a bipolar photoresponse photodetector based on Pt nanoparticle-modified p-AlGaN/n-GaN nanowires p-n heterojunctions. The bidirectional photocurrent phenomenon was observed in the semiconductor p-n heterojunction under 254 nm and 365 nm irradiation, overcoming the limitation of the unidirectional photocurrent of conventional p-n junctions.