Broadband, Polarization-Sensitive, and Self-Powered High-Performance Photodetection of Hetero-Integrated MoS ₂ on Lithium Niobate

Abstract

High-performance photodetectors hold promising potential in optical communication and imaging systems. However, conventional counterparts are suffering narrow detection range, high power consumption, and poor polarization sensitivity. Characteristics originating from switchable polarization in ferroelectrics can be used to optimize the photo-to-electric procedure and improve the photodetection performance. In this regard, we constructed a configuration by integrating 2-dimensional molybdenum disulfide (MoS 2 ) with ferroelectric lithium niobate (LiNbO 3 ), resulting in the MoS 2 /LiNbO 3 heterostructured photodetector. Benefiting from the pyroelectric effect of LiNbO 3 , the limitation of bandgap on the detection range can be broken, thus broadening the response band of the detector to 365 to 1,064 nm, as well as enabling the self-powered characteristic. Meanwhile, high carrier mobility and decent light absorbance of MoS 2 introduce robust light-matter interactions with the underlying LiNbO 3 , leading to ultrafast rise/fall times of ≈150 μs/250 μs and switching ratios of up to ≈190. Moreover, the highest responsivity, specific detectivity, and external quantum efficiency achieved were 17.3 A·W −1 , 4.3 × 10 11 Jones, and 4,645.78%, respectively. Furthermore, because of the anisotropy of the spontaneous-polarized LiNbO 3 substrate, the photocurrent of the device achieved a dichroic ratio of 7.42, comparing favorably to most MoS 2 -based photodetectors. This work demonstrates the integration potential between ferroelectric LiNbO 3 and 2-dimensional materials for high-performance photodetection.

Dual‐Crossbar Configurated Bi2O2Se Device for Multiple Optoelectronic Applications

“…The study found that the BSH and MSV devices still exhibit volatile photosensitive properties, while the TSH device maintains non‐volatile property. In addition, the overall photoresponse performance of these three types of devices is better than that of devices constructed on SiO 2 /Si substrates, which may be due to the larger dielectric constant of LiNbO 3 and the existence of stronger dielectric screening effect, thus benefiting the charge transportation process [ 52–54 ] (see Figure S6 and Table S2, Supporting Information).…”

Low-dimensional van der Waals materials for linear-polarization-sensitive photodetection: materials, polarizing strategies and applications

“…As shown in figures 9(a) and (b), the introduction of uniaxial tensile strain reduces the overall in-plane symmetry of the crystal structure of MoS 2 , with a consequent modification of the Brillouin zone. As shown in figure 9(c), compared to the pristine MoS 2 device exhibiting isotropic photoresponse [237], the uniaxial tensile strain endows the device with polarization angledependent photocurrent. Furthermore, the linear DR can be tuned by flexibly adjusting the extrinsic strain.…”

Recent progress of UCNPs–MoS2 nanocomposites as a platform for biological applications

“…Reproduced with permission. 15 Copyright 2023, Science Partner Journals. (D) Schematic representation for the construction of a MicroRNA probe.…”

“…[12][13][14] Therefore, researchers often combine MoS 2 with other nanomaterials to construct multifunctional nanocomposites for various applications. He et al 15 constructed a MoS 2 /LiNbO 3 heterostructure photodetector by integrating MoS 2 with LiNbO 3 , utilizing the high carrier mobility and tunable bandgap of MoS 2 (Fig. 1(C)).…”