An Uncooled LWIR-Detector With LSPR Enhancement and Selective Narrow Absorption

Tang, Ming‐Je; Hsiao, Hui Hsin; Hong, Chung-Hung; Wei, Huang; Lee, Si-Chen

doi:10.1109/lpt.2018.2839650

Cited by 2 publications

(1 citation statement)

References 16 publications

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“…However, absorption capability of the active materials and response performances of pyroelectric PDs in the NIR band remain a challenge. In recent years, plasmonic nanostructures have been widely researched because of their ability to manipulate light at a nanometer scale. − It is well known that metal nanostructures exhibit the LSPR effect, which allows light absorption to be enhanced at local interfaces. − Among them, Au nanoparticles (NPs) are an ideal choice because of their simple preparation process and excellent ability to capture light in the NIR region. − The LSPR effect generates a strong electric field around nanoparticles through radiation and non-radiation paths, transfers the generated hot electrons to the surface, and radiates heat near the nanoparticles, expanding the potential applications of photodetectors. , Recently, Zhu et al fabricated a band-selective pyroelectric detector by inserting Au NPs into the interlayer . However, this method introduces uncontrollable interface defects, and the high thermal conductivity of the Si substrate reduces the transient heat transfer of Au nanoparticles and pyroelectric effect of ZnO nanowires.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Performances of n-ZnO Nanowires/p-Si Heterojunctioned Pyroelectric Near–Infrared Photodetectors via the Plasmonic Effect

Wang

Zhu

et al. 2021

ACS Appl. Mater. Interfaces

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Although pyroelectric photodetectors have been intensively studied, the transient temperature change rate of pyroelectric materials is a main restrictive factor for improving the performance. In this work, we fabricate an ultrafast response self-powered near-infrared (NIR) photodetector (PD) based on Au nanoparticles (NPs) coated an n-ZnO nanowires (NWs)/p-Si heterojunction. The local surface plasmon resonance (LSPR) effect generated at the local contacts of Au NPs/ZnO NWs can significantly enhance the transient temperature change rate of the ZnO material to improve the photoresponse performances of the NIR PD. Compared with that in the pristine ZnO-based PD, the response time of the Au-coated NIR PD is decreased from 113 to 50 μs at the rising edge and 200 to 70 μs at the falling edge. Optical responsivity and detectivity of the Au-coated ZnO-based PD are increased by 212 and 266%, respectively. The pyroelectric current gain is produced by injecting hot electrons from the LSPR effect of Au NPs into the ZnO material and the thermal energy transfer caused by the photothermal effect of plasmonic Au nanostructure. This work provides an in-depth understanding of plasmonic effect-enhanced pyroelectric effect and presents a unique strategy for developing high-performance NIR photodetectors.

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