A flexible p-CuO/n-MoS<sub>2</sub> heterojunction photodetector with enhanced photoresponse by the piezo-phototronic effect

Zhang, Ke; Peng, Mingzeng; Wu, Wei; Guo, Junmeng; Gao, Guoyun; Liu, Yudong; Kou, Jinzong; Wen, Rongmei; Lei, Ying; Yu, Aifang; Zhang, Yang; Zhai, Junyi; Wang, Zhong Lin

doi:10.1039/c6mh00568c

Cited by 139 publications

(74 citation statements)

References 36 publications

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“…As a consequence, the devices exhibit a maximum responsivity as high as 2.3 × 10 4 A W −1 under −0.38% compressive strain, which represents a 26‐fold improvement over the highest value for previously reported single‐layer MoS 2 ‐based photodetectors. Piezo‐phototronic effect has also been employed to enhance the photoresponse of devices based on 2D MoS 2 flake/ZnO film and MoS 2 flake/CuO film vertical heterojunctions, as well as MoS 2 /rGO heterostructures . Upon external mechanical strain, the maximum responsivities of these devices can be enhanced by several to tens of times, which is attributed to the adjusted band structure at the heterojunction interface as well as the broadened depletion region induced by the piezo‐potential.…”

Section: D Layered Materials‐based Flexible Photodetectorsmentioning

confidence: 99%

Flexible Photodetectors Based on Novel Functional Materials

Xie

Yan

2017

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Flexible photodetectors have attracted a great deal of research interest in recent years due to their great possibilities for application in a variety of emerging areas such as flexible, stretchable, implantable, portable, wearable and printed electronics and optoelectronics. Novel functional materials, including materials with zero-dimensional (0D) and one-dimensional (1D) inorganic nanostructures, two-dimensional (2D) layered materials, organic semiconductors and perovskite materials, exhibit appealing electrical and optoelectrical properties, as well as outstanding mechanical flexibility, and have been widely studied as building blocks in cost-effective flexible photodetection. Here, we comprehensively review the outstanding performance of flexible photodetectors made from these novel functional materials reported in recent years. The photoresponse characteristics and flexibility of the devices will be discussed systematically. Summaries and challenges are provided to guide future directions of this vital research field.

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Section: D Layered Materials‐based Flexible Photodetectorsmentioning

confidence: 99%

Flexible Photodetectors Based on Novel Functional Materials

Xie

Yan

2017

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“…As a kind of electronic sensor for sensing light by electrical signals, ultraviolet (UV) photodetector possesses wide applications in biological/chemical analysis, flame monitoring, optical communications, day/night surveillance, and missile detection . Generally, an external power supply is required to prevent the recombination of photogenerated charge carriers (electron–hole pairs) for desirable photoresponse, which limits the miniaturization of photodetectors as well as their long‐term application in large‐scale arrays .…”

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Self‐Powered UV Photodetector Array Based on P3HT/ZnO Nanowire Array Heterojunction

Ouyang

Zhang

Yang

2017

Adv Materials Technologies

135

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noncentral-symmetric crystal structure beneficial for piezoelectric or pyroelectric polarization. [15][16][17][18] Until now, various self-powered photodetectors based on ZnO nanowires have been reported with high responsivity. [8,11,19] In particular, accelerated separation of charge carriers have been observed in ZnO-based organic-inorganic heterojunctions due to the formation of built-in electric field at the heterojunctions. [20,21] Besides, such organic-inorganic photodetectors are more attractive due to their unique flexibility and stability. [22] However, most of them require a relatively long response/ recovery time; thus, it is still challenging to improve the performance of related photodetectors in simple structures. Moreover, along with rapid growth of sensor networks that contain huge amounts of small UV sensors, it is highly desirable to integrate such photodetectors into self-powered array configuration to achieve largescale light imaging.In this work, we demonstrate a self-powered UV photodetector array based on p-P3HT/n-ZnO nanowire array heterojunction. The obtained photodetector exhibits large photoconductive gain, high responsivity, fast response and recovery speed, and uncomplicated low-cost fabrication process. Meanwhile, the thermal effect on UV photoresponse is investigated under quantitative temperature differences. The cooling-generated performance enhancement of this photodetector is suggested to arise from the thermo-phototronic effect, whereby an applied temperature difference modifies the energy band of p-n heterojunction by producing thermoelectric field. Finally, a multichannel photodetector array with 16 pixels is demonstrated for high-resolution UV imaging. This study pushes forward self-powered light imaging by integrating inorganic-organic hybrid photodetector into array configuration. Figure 1a illustrates the schematic structure of the self-powered poly(3-hexylthiophene) (P3HT)/ZnO photodetector, which consists of a transparent indium tin oxide (ITO) film electrode, a layer of ZnO nanowire array partially infiltrated with P3HT, a layer of poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate) (PEDOT:PSS) film, and an aluminum (Al) film electrode. The cross-sectional scanning electron microscope (SEM) image in Figure 1b confirms the final configuration of a fabricated device with an effective thickness of ≈4 µm, where we can see that the P3HT polymer is partially infiltrated into the interval of upper ZnO nanowires. The ZnO nanowire array was synthesized via a simple solution-based growth technique as given in the Self-powered photodetector array based on organic-inorganic heterojunction is extremely suitable for light imaging applications, owing to their unique flexibility and stability. Here, a self-powered ultraviolet (UV) photodetector based on p-P3HT/n-ZnO nanowire array heterojunction is demonstrated, which exhibits photoconductive gain of 4.2 × 10 −4 , responsivity of 125 µA W −1 , specific detectivity of 3.7 × 10 7 Jones, and response/recovery speed of less than 100 m...

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“…Alternatively, mechanical stimuli, which are abundant in the environment, can be used to design advance devices, most importantly for wearable technology . Mechanical stimuli can induce polarization charges across non‐centrosymmetric materials like ZnO and CdS due to the piezoelectric effect, which has been intensively utilized for various novel applications . Even a small mechanical deformation (e.g., strain) can generate polarization charges and this offers an alternate way of modulating carrier generation, transport, separation, and/or recombination in optoelectronic devices, such as solar cells and light emitting diodes .…”

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confidence: 99%

“…Even a small mechanical deformation (e.g., strain) can generate polarization charges and this offers an alternate way of modulating carrier generation, transport, separation, and/or recombination in optoelectronic devices, such as solar cells and light emitting diodes . Currently, the piezophototronic effect has been widely applied to enhance device performance however, its use for the multilevel current amplification has yet to be investigated …”

mentioning

confidence: 99%

“…So far, ZnO has been effectively applied in UV optoelectronics where performance was modulated by mixing with impurities and/or an applied electric field . However, few studies have attempted to tune the optoelectronic properties of ZnO thin film by utilizing the piezoelectric effect for next‐generation devices . A sophisticated device which combines high transmittance and flexibility has significant potential due to its multifunctionality and smart applications but has yet to be demonstrated.…”

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confidence: 99%

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Piezophototronic Effect Modulated Multilevel Current Amplification from Highly Transparent and Flexible Device Based on Zinc Oxide Thin Film

Kumar

Kim

Lee

et al. 2018

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In this work, a strain modulated highly transparent and flexible ZnO/Ag‐nanowires/polyethylene terephthalate optoelectronic device is developed. By utilizing the applied external strain‐induced piezophototronic effects of a ZnO thin film, a UV‐generated photocurrent is tuned in a wide range starting from 0.01 to 85.07 µA and it is presented in a comprehensive map. Particularly, the performance of the device is effectively enhanced 7733 times by compressive strain, as compared to its dark current in a strain‐free state. The observed results are explained quantitatively based on the modulation of oxygen desorption/absorption on the ZnO surface under the influence of applied strains. The presented simple optoelectronic device can be easily integrated into existing planar structures, with potential applications in highly transparent smart windows, wearable electronics, smartphones, security communication, and so on.

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A flexible p-CuO/n-MoS₂ heterojunction photodetector with enhanced photoresponse by the piezo-phototronic effect

Abstract: Flexible functional devices based on two dimensional (2D) materials are extremely suitable for malleable, portable and sustainable applications.

Cited by 139 publications

References 36 publications

Flexible Photodetectors Based on Novel Functional Materials

Flexible Photodetectors Based on Novel Functional Materials

Self‐Powered UV Photodetector Array Based on P3HT/ZnO Nanowire Array Heterojunction

Piezophototronic Effect Modulated Multilevel Current Amplification from Highly Transparent and Flexible Device Based on Zinc Oxide Thin Film

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A flexible p-CuO/n-MoS2 heterojunction photodetector with enhanced photoresponse by the piezo-phototronic effect

Abstract: Flexible functional devices based on two dimensional (2D) materials are extremely suitable for malleable, portable and sustainable applications.

Cited by 139 publications

References 36 publications

Flexible Photodetectors Based on Novel Functional Materials

Flexible Photodetectors Based on Novel Functional Materials

Self‐Powered UV Photodetector Array Based on P3HT/ZnO Nanowire Array Heterojunction

Piezophototronic Effect Modulated Multilevel Current Amplification from Highly Transparent and Flexible Device Based on Zinc Oxide Thin Film

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A flexible p-CuO/n-MoS₂ heterojunction photodetector with enhanced photoresponse by the piezo-phototronic effect