Flexible self-powered photoelectrochemical-type photodetector based on 2D WS2-graphene heterojunction

Ren, Xiaohui; Wang, Bo; Huang, Zongyu; Qiao, Hao; Duan, Chenguang; Zhou, Yang; Zhong, Jian; Wang, Ziyu; Qi, Xiang

doi:10.1016/j.flatc.2020.100215

Cited by 41 publications

(33 citation statements)

References 51 publications

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“…Figure 4a shows the schematic diagram of the PD structure. The thin SiO 2 passivation layer can be used to suppress the underlying current leakage, [2,29] which could be a key reason contributing to the ultrahigh detectivity (Table 1). Moreover, the PEC PD has the ultrahigh transmittance (Table 2; and Figure S5a, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Flexible Self‐Powered Photoelectrochemical Photodetector with Ultrahigh Detectivity, Ultraviolet/Visible Reject Ratio, Stability, and a Quasi‐Invisible Functionality Based on Lift‐Off Vertical (Al,Ga)N Nanowires

Jiang

Zhang

Yang

et al. 2022

Adv Materials Inter

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electronics, flexible screens, automobile windshield navigation, and IoT (Internet of Things) applications, etc. [1][2] However, the working duration and energy consumption are the key problems that cannot be ignored for the wide applications of optoelectronic devices. Thanks to the ability for long-time working independently without energy consumption, self-powered photodetectors (PDs) can be the indispensable devices to make the detection systems economical and simple. [2,4,6] As the crucial components in the detection system, ultraviolet (UV) PDs are required for the wide applications in UV communication, fire warning, high-voltage corona detection, and ozone-hole monitoring. [1][2] Therefore, self-powered UV PDs with high flexibility and invisible functionality are pretty promising and necessary for the nextgeneration optoelectronic devices.Up to now, some research groups have developed the labor-less self-assembly approaches of fabricating the PDs and sensors requiring low power consumption. [7][8][9] For instance, Nasiri et al. reported a fully transparent ZnO PD with a gigantic photo-to-dark current ratio of 9.3 × 10 6 based on structural engineering. [7] With a self-assembly SnO 2 −graphene oxide nanoheterojunctions, Pargoletti et al. fabricated a room-temperature chemical sensor with an excellent UV light responsivity of 400 A W −1 . [9] Flexible self-powered ultraviolet (UV) photodetectors (PDs) with an invisible functionality are essential but challenging to be fabricated for the applications of next-generation optoelectronic devices. In this work, a flexible photo electrochemical (PEC) (Al,Ga)N PD with three excellent characteristics, which are the ultrahigh UV/visible reject ratio, ultrahigh detectivity, and transmissivity, is proposed and demonstrated successfully. By numerical simulations, it is also found that the cross-sectional absorption area should be a nonignorable factor affecting the photogenerated current under bending states. After continuous long-time working or preserving, the PD performance can keep quite stable. Thanks to the pretty thin bending section of GaN connecting layer, the piezoelectric charges generated by stress are proposed to have only a limited effect in the energy band and photocurrent density. Therefore, when bending or twisting the PD at a high degree for many times, both the stable on-off switching characteristics and photocurrent densities can still be achieved. With the demonstrated ultrahigh detectivity and stability of flexibility, this PD would enable a broad range of optoelectronic applications, including omnidirectional UV detection and wearable intelligent sensors.

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Section: Resultsmentioning

confidence: 99%

Flexible Self‐Powered Photoelectrochemical Photodetector with Ultrahigh Detectivity, Ultraviolet/Visible Reject Ratio, Stability, and a Quasi‐Invisible Functionality Based on Lift‐Off Vertical (Al,Ga)N Nanowires

Jiang

Zhang

Yang

et al. 2022

Adv Materials Inter

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“…Preparation of the solid electrolyte: This process can be referred to previously published articles. 38 Preparation of the flexible photodetector: As shown in Figure 1, a certain amount of gel was applied evenly on the anode electrode and then counter electrode overlay on the top of the solid electrolyte to construct an integrated flexible photodetector.…”

Section: Methodsmentioning

confidence: 99%

Black Phosphorus Quantum Dots as Hole Capturers in Group-VA Monoelemental Heterostructures for the Application of High-Performance Flexible Photodetectors

Zhou

Qiao

Huang

et al. 2021

ACS Sustainable Chem. Eng.

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Herein, black phosphorus (BP) quantum dots (QDs) with consistent sizes are loaded on bismuth (Bi) nanosheets (NSs) uniformly to serve as hole capturers in Group-VA monoelemental heterostructures via a facile sonication approach. The as-fabricated Bi NSs-BP QD-based photodetectors exhibit 4.6 μA/cm2 photocurrent density at applied 0.8 V bias potential, about 4.2 times enhancement compared to Bi NSs, which contributes to the construction of type-II heterojunctions that effectively restrain the recombination of electron–hole pair and accelerates the transfer rate of carriers. Additionally, the photocurrent density of Bi NSs-BP QD-based photodetectors reaches 100 nA/cm2 without external power supply, allowing fabricated devices to work normally in an emergency. Meanwhile, long-cycle stability measurements reveal 15% photocurrent density attenuation after 2000 bending times and 8.8% under 60° bending angles. This work proves that the introduction of BP QDs significantly improves the performance of the Bi-based photodetector and provides a novel strategy to construct flexible photodetectors.

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“…Multilayer 2D nanomaterials can adjust their band gaps by changing the spacing between layers. [63][64][65][66] 2D nanomaterials have high carrier mobility, wide spectral response, low thickness, good mechanical flexibility, and can withstand large deformation.…”

Section: Two-dimensional (2d) Nanomaterialsmentioning

confidence: 99%

Fabrication, material regulation, and healthcare applications of flexible photodetectors

et al. 2022

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Flexible self-powered photoelectrochemical-type photodetector based on 2D WS2-graphene heterojunction

Cited by 41 publications

References 51 publications

Flexible Self‐Powered Photoelectrochemical Photodetector with Ultrahigh Detectivity, Ultraviolet/Visible Reject Ratio, Stability, and a Quasi‐Invisible Functionality Based on Lift‐Off Vertical (Al,Ga)N Nanowires

Flexible Self‐Powered Photoelectrochemical Photodetector with Ultrahigh Detectivity, Ultraviolet/Visible Reject Ratio, Stability, and a Quasi‐Invisible Functionality Based on Lift‐Off Vertical (Al,Ga)N Nanowires

Black Phosphorus Quantum Dots as Hole Capturers in Group-VA Monoelemental Heterostructures for the Application of High-Performance Flexible Photodetectors

Fabrication, material regulation, and healthcare applications of flexible photodetectors

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