Deep Ultraviolet Photodetector with Ultrahigh Responsivity based on a Nitrogen‐Doped Graphene‐Modified Polypyrrole/SnO 2 Organic/Inorganic p–n Heterojunction

Deep ultraviolet monitoring is realized via a high crystal quality SnO 2 microwire (MW)‐based photodetector (PD). This is then combined with 2D nitrogen‐doped graphene (NGr), conducting polymer polypyrrole (PPy), and an in situ polymerization‐fabricated composite film PPy‐NGr to construct an organic–inorganic p–n heterojunction PD. The long response time brought on by the oxygen adsorption of SnO 2 MW is greatly decreased via coating with the aforementioned materials. A defect response is created by the surface dangling bonds of SnO 2 MW, which can be effectively suppressed by the PPy. Absorption in the deep ultraviolet region (