A Dual-Band Multilayer InSe Self-Powered Photodetector with High Performance Induced by Surface Plasmon Resonance and Asymmetric Schottky Junction

Abstract

A dual-band self-powered photodetector (SPPD) with high sensitivity is realized by a facile combination of InSe Schottky diode and Au plasmonic nanoparticle (NP) arrays. Comparing with pristine InSe devices, InSe/Au photodetectors possess an additional capability of photodetection in visible to near-infrared (NIR) region. This intriguing phenomenon is attributed to the wavelength selective enhancement of pristine responsivities by hybridized quadrupole plasmons resonance of Au NPs. It is worth pointing out that the maximum of enhancement ratio in responsivity reaches up to ∼1200% at a wavelength of 685 nm. In addition, owing to a large Schottky barrier difference formed between active layer and two asymmetric electrodes, the responsivities of dual-band InSe/Au photodetector could reach up to 369 and 244 mA/W at the wavelength of 365 and 685 nm under zero bias voltage, respectively. This work would provide an additional opportunity for developing multifunctional photodetectors with high performance based on two-dimensional materials, upgrading their capacity of photodetection in a complex environment.

Self‐Powered Photodetectors Based on 2D Materials

“…g) Schematic diagram of the device structure of InSe/Au SPPD. Reproduced with permission . Copyright 2018, American Chemical Society.…”

“…Although asymmetric Schottky junction photodetectors enable self‐powered light detection without relying on external power supplies, the small photoresponse current of the Schottky junction self‐powered photodetector limits real‐life applications. Therefore, Dai et al fabricated a self‐powered photodetector with high sensitivity and high response performance by loading an Au plasma nanoparticle array on the surface of the InSe Schottky diode (Figure g). Compared to the original InSe Schottky junction photodetector, the InSe Schottky junction photodetector has higher sensitivity and photoresponse performance and has additional photodetection capability in the visible to near‐infrared region.…”

Design strategies for two‐dimensional material photodetectors to enhance device performance

“…The simulated optical field distribution confirmed that plasmon resonance effect mainly originated from the near‐field oscillation and scattering effect. Tian et al demonstrate their graphene photodetectors enhanced by plasmonic Cu 3 − x P colloidal nanocrystals with an ultrahigh responsivity (1.59 × 10 5 A/W) . Dai et al fabricated a dual band self‐powered photodetector by a combination of InSe Schottky diode and Au plasmonic nanoparticle arrays as shown in Figure C .…”

Surface Plasmonic‐Assisted Photocatalysis and Optoelectronic Devices with Noble Metal Nanocrystals: Design, Synthesis, and Applications

“…d) Schematic illustration of self‐powered, plasmon‐induced dual band photodetector. Reproduced with permission . Copyright 2018, American Chemical Society.…”

“…Furthermore, the proposed structure qualifies to the plasmonic device to extend its photoresponse range by four orders of magnitude. Dai et al used the plasmonic technique to develop 2D material InSe‐based photodetector with an asymmetric geometry, as shown in Figure d . The proposed heterostructure exhibits the excellent responsively of 369 mA W −1 at light intensity of 365 nm, on/off ratio of 10 3 , and exhibits self‐powered photodetector.…”