A Plasmon‐Enhanced SnSe₂ Photodetector by Non‐Contact Ag Nanoparticles

Abstract

The 2D layered materials are promising candidates for broadband, low‐cost photodetectors. One deficiency of 2D materials is the relatively low absorbance of light, limiting the applications of the 2D photodetectors. Doping of plasmonic nanoparticles into 2D materials may enhance the optical absorbance owing to the localized surface plasmonic resonance (LSPR) effect; however, considerable defects may be introduced into the 2D materials at the same time, resulting in certain degradation of device performance. Here, a novel design of 2D photodetectors with enhanced photoresponsivity by non‐contact plasmonic nanoparticles (NPs) is proposed, consisting of a hybrid structure of few‐layer SnSe2 transferred a fused silica (SiO2) plate with embedded Ag NPs. The system of Ag NPs‐in‐SiO2 shows strong LSPR effect with significantly enhanced optical absorption, acting on SnSe2 in a non‐contact configuration. Benefiting from well‐preserved intrinsic features of SnSe2 and LSPR effect, the responsivity of the photodetector is enhanced by 881 times with the bias voltage of 0.1 V, which is superior to previously reported results of plasmon‐enhanced 2D photodetectors. Moreover, the SiO2 with embedded Ag NPs is recyclable and can be easy to be recombined with different 2D materials. This work offers additional strategy for development of efficient, low‐cost 2D photodetectors by using plasmonic NPs.

Plasmon-enhanced photoresponse and stability of a CsPbBr3 microwire/GaN heterojunction photodetector with surface-modified Ag nanoparticles

“…Additionally, the excitation of localized surface plasmon resonances of the covered metal nanoparticles can further result in enhanced optical scattering and absorption as well as strong localized field enhancement. [59][60][61] As we mentioned in the Experimental section, AgNPs with physically-isolated and uniform distribution were prepared on a sapphire substrate using magnetron sputtering technology and annealing treatment. 49,62,63 Fig.…”

“…The AgNPs acting as the transition layer enables the easier transport of photo-generated electron-hole pairs, bringing about fast transporting speed and high transporting efficiency. 58,60 The working mechanisms of the AgNPs-enhanced overall performances of our constructed CsPbBr 3 /p-GaN heterojunction photodetectors were systematically analyzed. In the optimized photodetectors, AgNPs featuring as subwavelength scattering element can effectively promote absorption of incoming light.…”

Recent progress on Schottky sensors based on two-dimensional transition metal dichalcogenides

“…Thus, considering this, a photodetector based on non-contact plasmonic Ag NPs and few-layer SnSe 2 was designed to demonstrate the significant enhancement of performance. 105 Consequently, the responsivity of the SnSe 2 /AgNP:SiO 2 photodetector was enhanced by 881, 430, 40 and 11 times that of the devices without Ag NPs under illumination of 405, 635, 1310, and 2200 nm light, respectively. Furthermore, the lattice structure of SnSe 2 was perfectly preserved.…”

Engineering Surface Plasmons in Metal/Nonmetal Structures for Highly Desirable Plasmonic Photodetectors

“…As expected, this hybrid structure demonstrated a 7.45-fold enhancement in photoresponsivity, compared with the structure without Ag NP-silica metal film (Figure c). Sun et al proposed a novel 2D photodetector composed of a few-layer SnSe 2 coated SiO 2 embedded with Ag NPs. Significant enhancement of optical absorption and effective separation of electron–hole pairs were obtained by the LSPR effect.…”