Hierarchical thornbush-like organic nanostructures via surface grafting for high-performance multi-level photomemory devices

초록

Developing multicomponent organic microwire (MW) systems often faces the challenge of performance deterioration at p-n junctions. Herein, we report a hierarchical multicomponent system featuring thornbush-like nanostructures composed of p-type porphyrin (TCPP) and n-type perylene diimide (BPE-PTCDI) MWs, fabricated via a facile surface-grafting method. This unique 3D branched architecture maximizes light absorption across the entire visible spectrum by leveraging the complementary optical properties of both components and the light-trapping effect of the thornbush-like structure. Notably, the optimized heterostructure overcomes typical p-n junction drawbacks, maintaining high n-type charge transport characteristics (average & micro;e = 0.33 cm2 V-1 s-1) while exhibiting a 100-fold increase in electron mobility under light-soaking conditions, driven by the photo-assisted catalytic properties of TCPP. When integrated into organic field-effect transistors and phototransistors, these nanostructures demonstrate outstanding photoresponsivity and stability. Furthermore, the excellent charge-trapping capability of the TCPP/BPE-PTCDI interface enables multi-level programmable non-volatile photo-memory behavior with a large memory window. This work provides a powerful strategy for structural optimization in organic multicomponent systems, expanding their potential for high-density, multifunctional optoelectronic applications.

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