Plasmonic Au@Ag-upconversion nanoparticle hybrids for NIR photodetection via an alternating self-assembly method

Flat and dense monolayer Au@Ag nanorods/UCNPs (50–400 nm) is fabricated by an alternating self-assembly method. The optimized photoresponsivity and detectivity of Au@Ag NRs/UCNPs (150 nm)/MAPbI 3 PDs is separately 0.51 A W −1 and 6.9 × 10 9 Jones.