▎ 摘　　要

NOVELTY - Sandwich structure comprises gallium indium alloy needle tip, perovskite microcrystals, and monolayer graphene on a silicon substrate. USE - The structure is useful for integrated semiconductor device. ADVANTAGE - The structure enhances the recombination of photogenerated carriers, makes the IV curve exhibit a negative differential resistance effect, and provides a new method for future new integrated semiconductor devices to work stably and normally at room temperature and high voltage. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for structural device. DESCRIPTION OF DRAWING(S) - The drawing uses perovskite microcrystal to realize the negative differential resistance method three-dimensional diagram at room temperature. Needle tube (1) Purple light (2) Gallium indium alloy needle tip (3) Perovskite micron crystal (4) Monolayer graphene (5) Silicon substrate (6) Piezoelectric device (7)