High-performance self-powered photodetector based on Bi 2 O 2 Se nanosheets
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High‑performance self‑powered photodetector based on Bi2O2Se nanosheets Gexiang Chen1,2 · Jie Wu1,2 · Bo Wang1,2 · Jun Li1,2 · Xiang Qi1,2 Received: 10 April 2020 / Accepted: 24 June 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract 2D layered material Bi2O2Se nanosheets, due to its high carrier mobility, near-ideal subthreshold swing, and high air-stability, which have shown great potential for applications in high-performance field-effect transistors and photodetector. Here, we have been successfully synthesized Bi2O2Se nanosheets via a facile one-step hydrothermal method. The Bi2O2Se nanosheets were characterized by scanning electron microscopy (SEM), Raman spectra and X-ray diffraction (XRD) patterns, which confirm i2O2Se nanosheets were used to fabricate electrodes for a an excellent crystallized of B i2O2Se nanosheets. The as-prepared B self-powered photodetector and exhibit preferable photoresponse activity. At 0 V, the photoeletrochemical (PEC) tests demonstrate that the responsivity and the response time of Bi2O2Se nanosheets can reach up to 20 μA W−1 and 0.12 s. Furthermore, the time stability and cycle stability also were measured. After a long time of testing, the photocurrent of Bi2O2Se nanosheets remained around 300 nA, and after processing 100 and 200 cycles, the photocurrent exhibits slight distinction. These findings indicate that Bi2O2Se nanosheets have great prospects for future applications in self-powered photodetector devices. Keywords Self-powered photodetector · High-performance · Simple hydrothermal method
1 Introduction In recent years, two-dimensional (2D) materials have been widely studied and applied in thermoelectric and electronics due to their advantages of ultrathin thickness, ultrafast optoelectronic characteristics, high crystallinity, high surface area ratio, faster response time and so on [1, 2]. Recently, a new two-dimensional (2D) material B i2O2Se has attracted significant interest and has been extensively studied. Bi2O2Se is a layered crystal structure composed of ( Bi2O2)n2n+ and Sen2n− layers, which are bonded by electrostatic forces between layers [3, 4]. Compared with previous materials, * Jun Li [email protected] * Xiang Qi [email protected] 1
Hunan Provincial Key Laboratory of Micro‑Nano Energy Materials and Devices, School of Physics and Optoelectronics, Xiangtan University, Hunan 411105, People’s Republic of China
Laboratory for Quantum Engineering and Micro‑Nano Energy Technology, Xiangtan University, Hunan 411105, People’s Republic of China
2
this material has higher carrier mobility and ambient stability [5, 6]. Its carrier mobility reaches 20,000 cm2V−1 s−1 at low temperature [3].In addition to higher carrier mobility, Bi2O2Se also has prominent response time and responsivity. Li et al. produced a high-performance Bi2O2Se photodetector with a responsivity of 6.5A W−1 and response time of 2.8 s in the visible to near-infrared [3]. The responsivity and response time of the oriented layered B i2O2Se nanowires
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