Investigation on the Agpt and Agpd Hybrid Alloy Nanoparticles (Hanps) for the Hybrid Mos2/Zno/Hanp Uv Photodetector Application

Abstract

Hybrid photodetectors made of two or more nanomaterial constituents can offer the potential for advanced photodetection applications with enhanced light absorption, improved efficiency and structural tunability. A hybrid UV photodetector (PD) configuration incorporating the plasmonic hybrid alloy nanoparticles (HANP), ZnO quantum dots (QDs) and MoS2 nanoflakes, namely MoS2/ZnO/HANP PD, is demonstrated. The optimized MoS2/ZnO/HANP PD exhibits a high photocurrent of 5.66 mA at 0.34 mW/mm2 under 385 nm illumination with two orders of improvement from the bare ZnO, which is one of the highest photocurrents by the ZnO-based PDs. It also demonstrates high figure-of-merits with the responsivity of 14,523 mA/W, detectivity of 8.13 × 1011 jones, and external quantum efficiency (EQE) of 4,680%, outperforming most of the ZnO-based hybrid architectures. The enhanced photoresponse is primarily attributed to the significantly enhanced hot electron generation by the AgPd HANPs and photocarrier collection by ZnO QD layer. MoS2 nanoflakes also provide additional photon absorption sites and boost the photo-carrier transfer process. HANPs are grown by adapting a dual-step solid-state dewetting process (SSD) approach and the superiority of AgPd HANPs is confirmed by the systematic investigation, FDTD simulations and comparison of AgPt and AgPd HANPs.

Keywords: hybrid alloy nanoparticle (HANP), LSPR, SSD, hybrid UV photodetector, zinc oxide, MoS2