All-inkjet-printed flexible ZnO micro photodetector for a wearable UV monitoring device

Tran, Vinh; Wei, Yuefan; Yang, Hongyi; Zhan, Zhaoyao; Du, Hejun

doi:10.1088/1361-6528/aa57ae

Cited by 72 publications

(58 citation statements)

References 64 publications

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“…Recently, Tran et al fabricated flexible UV detectors by using inkjet printing and zinc acetate dihydrate, as shown in Figure b . In that study, a high on–off ratio of 3525 was obtained when the samples were irradiated with UV light of 33 W m −2 .…”

Section: Electronic Applications Of Solution Direct‐patterned Mo Micrmentioning

confidence: 98%

Section: Electronic Applications Of Solution Direct‐patterned Mo Micrmentioning

confidence: 99%

“…It was discovered that the rise time is faster when the sample is irradiated with high‐intensity UV light. However, a gradual decrease in photocurrent was observed during the irradiation of high‐intensity UV light, which is explained by the faster charge recombination rate due to the photoinduced degradation of the ZnO UV detector . Figure d shows the photocurrent of the ZnO UV detector bent at different bending radii.…”

Section: Electronic Applications Of Solution Direct‐patterned Mo Micrmentioning

confidence: 99%

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Solution‐Based Micro‐ and Nanoscale Metal Oxide Structures Formed by Direct Patterning for Electro‐Optical Applications

2018

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Due to their transparency and tunable electrical, optical, and magnetic properties, metal oxide thin films and structures have many applications in electro-optical devices. In recent years, solution processing combined with direct-patterning techniques such as micro-/nanomolding, inkjet printing, e-jet printing, e-beam writing, and photopatterning has drawn much attention because of the inexpensive and simple fabrication process that avoids using capital-intensive vacuum deposition systems and chemical etching. Furthermore, practical applications of solution direct-patterning techniques with metal oxide structures are demonstrated in thin-film transistors and biochemical sensors on a wide range of substrates. Since direct-patterning techniques enable low-cost fabrication of nanoscale metal oxide structures, these methods are expected to accelerate the development of nanoscale devices and systems based on metal oxide components in important application fields such as flexible electronics, the Internet of Things (IoT), and human health monitoring. Here, a review of the fabrication procedures, advantages, limitations, and applications of the main direct-patterning methods for making metal oxide structures is presented. The goal is to highlight the examples with the most promising perspective from the recent literature.

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Section: Electronic Applications Of Solution Direct‐patterned Mo Micrmentioning

confidence: 98%

Section: Electronic Applications Of Solution Direct‐patterned Mo Micrmentioning

confidence: 99%

Section: Electronic Applications Of Solution Direct‐patterned Mo Micrmentioning

confidence: 99%

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Solution‐Based Micro‐ and Nanoscale Metal Oxide Structures Formed by Direct Patterning for Electro‐Optical Applications

2018

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“…Since the device performance mainly depends on the active materials and device architectures, they are the subject of extensive work, and there have been many achievements. Dispersible inorganic materials vastly simplify the preparation of films while maintaining good electrical conductivity; organic small‐molecule materials and polymer materials have wide wavelength response, especially in visible region, and can be adjusted easily by changing the functional groups; organic–inorganic hybrid material systems are also a promising development direction, combining good electrical and optical properties; in addition, the perovskite series of organic–inorganic hybrid materials has become a new research direction due to their excellent optoelectronic properties . In addition, varieties of microstructures including nanoparticles, nanowires, nanosheets etc., have been widely investigated, and they have a wide range of applications in devices benefiting from their peculiar characteristics, like quantum size effect and anisotropy .…”

Section: Introductionmentioning

confidence: 99%

Strategies toward High‐Performance Solution‐Processed Lateral Photodetectors

Lin

Wang

2019

Advanced Materials

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Since the device performance mainly depends on the active materials and device architectures, they are the subject of extensive work, and there have been many achievements. Dispersible inorganic materials vastly simplify the preparation of films while maintaining good electrical conductivity; [1][2][3][4][5] organic small-molecule materials and polymer materials have wide wavelength response, especially in visible region, and can be adjusted easily by changing the functional groups; [6][7][8][9][10] organic-inorganic hybrid material systems are also a promising development direction, combining good electrical and optical properties; [11][12][13][14][15] in addition, the perovskite series of organic-inorganic hybrid materials has become a new research direction due to their excellent optoelectronic properties. [16][17][18][19][20] In addition, varieties of microstructures including nanoparticles, nanowires, nanosheets etc., have been widely investigated, and they have a wide range of applications in devices benefiting from their peculiar characteristics, like quantum size effect and anisotropy. [21][22][23][24][25] Besides working on active materials, constructing diverse device architectures is also a convenient and effective approach. [26][27][28][29][30] The fabrication of blend, bilayer, and multilayer architectures would be conducive to increasing responsivity, extending detection range, and accelerating response speed.Here, from active materials to device architectures, we systematically introduce and discuss the strategies for improving the device performance of solution-processed lateral PDs. To begin with, we briefly expound the working mechanism of the lateral PDs and clarify the key device figures-of-merit. Then, based on the active materials, we divide the devices into four categories: inorganic, organic, hybrid, and perovskite, and their corresponding improvement methods are summarized respectively. To close, we conduct a physical generalization and propose detailed suggestions for the further development of the field. Device Working PrincipleThe structures of lateral PDs are quite simple: an active layer between two parallel electrodes or using three electrodes (source, drain, and gate) for better control; and the detection of light mainly originates from the change of conductivity, which is caused by the increase of the carrier concentration under illumination.Due to their low cost and ease of integration, solution-processed lateral photodetectors (PDs) are becoming an important device type among the PD family. In recent years, enormous effort has been devoted to improving their performances, and great achievements have been made. A summary of the core progress, especially from the perspective of design principles and device physics, is necessary to further the development of the field, but is currently lacking. Here, to address this need, first, the working mechanism of PDs and the device figures-of-merit are introduced. Second, by classifying the active materials into four categories, including in...

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“…[2] With recent advances in smart health care technology, the demand for transparent and flexible UV sensors that can be integrated into portable or wearable devices is rapidly growing for numerous potential applications, including smart watches/bands, smart glasses, and patchable devices. [2] With recent advances in smart health care technology, the demand for transparent and flexible UV sensors that can be integrated into portable or wearable devices is rapidly growing for numerous potential applications, including smart watches/bands, smart glasses, and patchable devices.…”

mentioning

confidence: 99%

A Fully Transparent, Flexible, Sensitive, and Visible‐Blind Ultraviolet Sensor Based on Carbon Nanotube–Graphene Hybrid

Pyo

Choi

Kim

2018

Adv Elect Materials

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generates free-radical chemical species that cause various skin diseases such as inflammatory disorders, aging, and skin cancer. [2] With recent advances in smart health care technology, the demand for transparent and flexible UV sensors that can be integrated into portable or wearable devices is rapidly growing for numerous potential applications, including smart watches/bands, smart glasses, and patchable devices. [3][4][5] However, Si-based UV sensors, the most established commercial sensors, are unsuitable for use in such applications because of their lack of mechanical flexibility and optical transparency and their need for high operating voltage and a long-pass filter to block low energy photons. [6] To overcome these shortcomings, nanomaterial-based UV sensors have been extensively studied. [7][8][9][10] 1D and 2D semiconducting materials such as ZnO, TiO 2 , GaTe, and MoS 2 are promising candidates for photodetection because of their direct bandgap at room temperature, transparency in the visible region, and mechanical flexibility. [11][12][13][14] Accordingly, those materials have been used for the active component of sensitive, transparent, and flexible UV sensors. [15][16][17][18][19] The UV sensors based on nanomaterials generally show high-performance in terms of photoresponsivity and response/recovery time, but most of them still rely on intrinsically opaque metal electrodes. [15,16] Although a few works have reported UV sensors where all the active or passive components were transparent, [17,18] the brittle electrode (e.g., indium tin oxide; ITO) limits the flexibility of the sensor, since ITO easily fractures under a strain of only 1%. [20] To achieve both optical transparency and mechanical flexibility, all the components of the UV sensor must be transparent and flexible. In addition, contact resistance between the photoactive material and the electrodes is a significant factor influencing the performance of UV sensors and must be considered in order to induce an effective charge transfer from the photoactive material to the electrodes. [21,22] This implies that selection of both photoresponsive and electrode materials would regulate the overall photoresponse as well as transparency and flexibility of the UV sensor.One of the promising alternatives is a combination of carbon nanomaterials, including 1D carbon nanotubes (CNTs) and

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All-inkjet-printed flexible ZnO micro photodetector for a wearable UV monitoring device

Cited by 72 publications

References 64 publications

Solution‐Based Micro‐ and Nanoscale Metal Oxide Structures Formed by Direct Patterning for Electro‐Optical Applications

Solution‐Based Micro‐ and Nanoscale Metal Oxide Structures Formed by Direct Patterning for Electro‐Optical Applications

Strategies toward High‐Performance Solution‐Processed Lateral Photodetectors

A Fully Transparent, Flexible, Sensitive, and Visible‐Blind Ultraviolet Sensor Based on Carbon Nanotube–Graphene Hybrid

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