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Title: Investigation on the AgPt and AgPd hybrid alloy nanoparticles (HANPs) for the hybrid MoS2/ZnO/HANP UV photodetector application

Journal Article · · Applied Surface Science
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  1. Kwangwoon University, Seoul (Korea, Republic of)
  2. Wuhan University (China)
  3. Kwangwoon University, Seoul (Korea, Republic of); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

We report hybrid photodetectors made of two or more nanomaterial components can offer the high 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 x 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 through the 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 systematic investigation, FDTD simulation and comparison of AgPt and AgPd HANPs.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); National Research Foundation of Korea (NRF); National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC); Central Universities
Grant/Contract Number:
89233218CNA000001; NRF-2022R1H1A2091290; NRF-2019R1A2C4069438; NRF-2018R1A6A1A03025242; 2021YFF0603500; 61705070; WUT:2021VA056
OSTI ID:
1909537
Report Number(s):
LA-UR-23-20269
Journal Information:
Applied Surface Science, Vol. 611, Issue Part A; ISSN 0169-4332
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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