Optimizing the performance of ZnO/Au/MgZnO/SiO 2 sandwich structured UV photodetectors by surface plasmons in Ag nanopar
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Optimizing the performance of ZnO/Au/MgZnO/SiO2 sandwich structured UV photodetectors by surface plasmons in Ag nanoparticles Meng Li1,2 · Man Zhao1,2 · Dayong Jiang1,2 · Qian Li1 · Chuncai Shan1 · Xuan Zhou1 · Yuhan Duan3 · Nan Wang1 · Jiamei Sun1 Received: 12 November 2019 / Accepted: 23 March 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The dual-wavelength UV photodetector (PD) with sandwich structure of ZnO/Au/MgZnO/SiO2 was fabricated and investigated with an emphasis on the effects of the Ag nanoparticles localized surface plasmons (LSPs). The results demonstrated that the modification in Ag nanoparticle (NP) position played a remarkable influence on the performance of dual-wavelength UV photodetectors. In comparison with decorating Ag NPs on the surface of the PDs, embedding Ag NPs between the MgZnO and ZnO films could improve two peak responsivities (caused by MgZnO and ZnO layers) significantly. By calculating the responsivities enhancement ratio of double layers (MgZnO and ZnO), the results indicated that the enhancement ratio of MgZnO is higher than that of ZnO. This was ascribed to LSPs of energy match with MgZnO which was superior to ZnO. This work described a creative method for increasing the performance of dual-wavelength UV PDs. Keywords ZnO · MgZnO · Dual wavelength · UV photodetectors · Ag nanoparticles · Surface plasmons
1 Introduction In recent years, many different applications for UV PDs have been reported, including missile warning and tracking systems, flame detection, chemical/biological detection, and space communication [1–4]. ZnO appears to be an ideal matrix material for UV PDs because of its wide band gap, high chemistry stability and low cost [5–8]. Furthermore, alloying MgO with ZnO provides a straightforward way to adjust the band gap (3.3–7.8 eV), which is beneficial for detection in the shorter wavelength region * Man Zhao [email protected] * Dayong Jiang [email protected] 1
School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, China
2
Engineering Research Center of Optoelectronic Functional Materials, Ministry of Education, Changchun, Jilin Province, China
3
Research Center for Space Optical Engineering, Harbin Institute of Technology, Harbin 150001, China
[9, 10]. To date, dual-wavelength UV PDs were successfully realized based on ZnO/MgZnO double-layer films. For instance, Hwang et al. have reported an M gxZn1−xO/ ZnO metal-semiconductor-metal (MSM) PD, whose detection wavelength could be modulated from a single to a double wavelength via varying the bias voltage [11]. In addition, Liu et al. have demonstrated a bias-tunable detection based on ZnO/MgZnO dual-layer structure, and the ZnO responsivity peaks blueshift from 380 to 370 nm by increasing the bias voltage [12]. However, these reports have focused mainly on the effect of the applied voltage on the PDs, and very few studies have been done on the effect of surface plasmons (SPs) in the dual-wavelength UV PDs
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