Surmounting the interband threshold limit by the hot electron excitation of multi-metallic plasmonic AgAuCu NPs for UV photodetector application

Lin, Shusen; Kulkarni, Rakesh; Mandavkar, Rutuja; Habib, Md Ahasan; Burse, Shalmali; Kunwar, Sundar; Lee, Jihoon

doi:10.1039/d2ce00367h

Title: Surmounting the interband threshold limit by the hot electron excitation of multi-metallic plasmonic AgAuCu NPs for UV photodetector application

Journal Article · Fri May 13 00:00:00 EDT 2022 · CrystEngComm

DOI:https://doi.org/10.1039/d2ce00367h· OSTI ID:1875807

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^[1]; Habib, Md Ahasan ^[1];

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Kwangwoon University, Seoul (Korea, Republic of)
Kwangwoon University, Seoul (Korea, Republic of); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

We report multi-metallic alloy NPs composed of various elemental compositions can surmount the interband threshold limit of mono-metallic NPs and thus can offer a promising route to boost up the performance limit of conventional ultraviolet photodetectors (PDs). In this work, a hybrid UV-PD configuration has been demonstrated by combining the multi-metallic plasmonic alloy NPs of AgCu, AuCu, and AgAuCu on a GaN photoactive layer in order to exploit the improved photo carrier injection by the strong hot electrons and LSPR. Among various devices, the tri-metallic AgAuCu NP PD demonstrates the highest performance with a remarkably high photocurrent of 1.47 x 10^-2 A at 1 V with fast rise (T_r) and fall (T_f) times of 170 and 700 ms with a very stable current. This leads to the superior figure-of-merit parameters of the PD with a photoresponsivity of 4.3 x 10⁶ mA W-1, detectivity of 3.52 x 10¹² Jones and EQE of 1.39 x 10⁶%, which is ~16 times higher than the bare GaN PD. This ranks the AgAuCu PD as one of the best GaN based UV photodetectors. The photocurrent enhancement and excellent figure-of-merit can be attributed to the significantly increased photo carrier injection by the efficient hot electron generation via the LSPR and improved interfacial barrier characteristics by the tri-metallic elemental synergy.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program; National Research Foundation of Korea (NRF); Kwangwoon University

Grant/Contract Number:: 89233218CNA000001; NRF-2019R1A2C4069438; NRF-2018R1A6A1A03025242

OSTI ID:: 1875807

Alternate ID(s):: OSTI ID: 1869739

Report Number(s):: LA-UR-22-25125

Journal Information:: CrystEngComm, Vol. 24, Issue 22; ISSN 1466-8033

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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