Size‐Controlled Graphene Nanodot Arrays/ZnO Hybrids for High‐Performance UV Photodetectors

Tang, Ruidie; Han, Sancan; Teng, Feng; Hu, Kai; Zhang, Zhiming; Hu, Mingxiang; Fang, Xiaosheng

doi:10.1002/advs.201700334

Cited by 75 publications

(42 citation statements)

References 53 publications

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“…An external voltage is applied to read out the photon‐derived carriers, and gain can be realized by multiple carrier recirculation. Since more than one electron can flow in consequence of a single absorbed photon, the EQE of >100% is possible, which means that an incident photon triggers an electrical current flow provided by numerous electrons …”

Section: Fundamentals Of Photodetectorsmentioning

confidence: 99%

Recent Progress on Photomultiplication Type Organic Photodetectors

Miao

Zhang

2018

Laser & Photonics Reviews

222

182

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Photodetectors as a significant unit of intelligent optoelectronic systems have stimulated immense attention from multidisciplinary areas. Photomultiplication (PM) is desirable for sensitive photodetectors with strong detection capability of weak light, which can further simplify the photo‐detection systems without pre‐amplifier circuit. For organic photodetectors (OPDs), PM phenomenon cannot be realized by utilizing the principle of avalanche effect or impact ionization as in inorganic materials, stemming from organic semiconductor materials with large exciton binding energy and disordered structure. In this review, the recent progress on PM type OPDs is comprehensively summarized from the perspective of device physics and material science. Charge tunneling injection induced by interfacial traps becomes the mainstream working mechanism for obtaining PM phenomenon. A series of PM type OPDs was achieved by utilizing interfacial blocking layer and introducing trap states into active layer or interfacial layer. The filter‐free PM type narrowband OPDs are realized by combining the concept of charge injection narrowing with the mechanism of PM. Meanwhile, further development on this hot topic is proposed and fully discussed, including multifunctional OPDs, organic–inorganic hybrid photodetectors, and photodetector systems.

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Section: Fundamentals Of Photodetectorsmentioning

confidence: 99%

Recent Progress on Photomultiplication Type Organic Photodetectors

Miao

Zhang

2018

Laser & Photonics Reviews

222

182

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“…ZnO film devices demonstrate great potential in UV PDs field because of their structural simplicity, environmental friendliness, and large‐scale and low‐cost preparation. However, the practical applications of ZnO film UV PDs have been seriously hindered from their low on/off ratio (≈10) or long decay time (≈20 s) due to the influence of adsorption and desorption of surface oxygen molecules . A variety of methods have been reported for improving the performance of ZnO devices including surface plasma modification, internal doping, heterojunction, and surface functionalization .…”

Section: Introductionmentioning

confidence: 99%

Self‐Polarized BaTiO₃ for Greatly Enhanced Performance of ZnO UV Photodetector by Regulating the Distribution of Electron Concentration

Zhang

Zhao

Chen

et al. 2019

Adv Funct Materials

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ZnO film ultraviolet photodetectors (UV PDs) have always suffered from slow speed and low photosensitivity that restrict their broader applications. To break through those barriers, high-performance ZnO UV PD based on self-polarized BaTiO 3 (BTO) is first introduced through a facile one-step spin-coating method. Compared with pure ZnO film UV PD with low on/ off ratio (65) and slow speed (4.1/7.5 s) at 3 V bias under 350 nm UV light, the BTO-ZnO bilayer film device exhibits an ultrahigh on/off ratio (14 300) and ultrafast response speed (0.11/5.80 ms), which is much faster than that of the most reported ZnO film-based UV PDs. The numerical simulation demonstrates that the spatial distribution of electron concentration of ZnO film is regulated by the self-polarization of BTO film, resulting in low dark current and fast response time of the BTO-ZnO PD. This work provides a new approach to fabricate high-performance PDs based on self-polarized ferroelectric materials.

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“…However, the mechanical brittleness, high electrical resistance, and deposition temperature (≈300 °C) limit their applications in large‐area/flexible/curved optoelectronic devices. Therefore, several candidates, including carbon nanotubes, graphene, conductive polymers, and metal‐network electrodes (MNEs) were investigated to replace ITO films. Due to the relatively low electrical conductivity of large‐scale graphene and high contact resistance of carbon nanotubes, the applications of these carbon‐based nanomaterials are highly limited.…”

Section: Introductionmentioning

confidence: 99%

High‐Performance, Micrometer Thick/Conformal, Transparent Metal‐Network Electrodes for Flexible and Curved Electronic Devices

Liu

Xiao

Rao

et al. 2018

Adv Materials Technologies

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deposition temperature (≈300 °C) limit their applications in large-area/flexible/ curved optoelectronic devices. Therefore, several candidates, including carbon nanotubes, [4,10] graphene, [11,12] conductive polymers, [13,14] and metal-network electrodes (MNEs) [15,16] were investigated to replace ITO films. Due to the relatively low electrical conductivity of large-scale graphene and high contact resistance of carbon nanotubes, the applications of these carbon-based nanomaterials are highly limited. And further on the poor conductivity and instability of conducting polymers, MNEs are a strong candidate due to their superior electrical and optical performance. [17][18][19] The solution-processed metal nanowires such as Ag NWs [20,21] and Cu NWs [22][23][24] are excellent materials to structure high-property electrodes by a coating process. [25] However, the contact resistance at the nanogap junctions between these nanowires results in much lower conductivity compared to the evaporated metal electrodes. Moreover, the poor adhesion [26] and protrusions [27] limit the applications of these solution-processed electrodes. The continuous metal nanowires could be fabricated by the using of a electrospun nonwoven masks [28][29][30][31][32] before the metal evaporation process and avoids the influence of contact resistance. But the disorderly arrangement of metal nanowires makes the inhomogeneity of film conductivity and results in the inferior quality of electrodes. Screen printing or inkjet printing can construct and arrange metal nanowires networks by using the metal precursor solution [33,34] or metal nanoparticle pastes, [35][36][37] but usually requiring a high temperature annealing (>200 °C) process. The high temperature heavily limits the selection of polymeric/elastomeric substrates. Therefore, in addition to transparency and resistance, low preparation temperature is very important in flexible MNEs.In this work, we reported highly transparent, ultrathin/ curved MNEs fabricated by programmable electrohydrodynamic (EHD) lithography, which directly generates high-resolution pattern of photoresist on ultrathin and curved substrates. The EHD lithography technique is a simple, data-driven, and inexpensive process, avoiding exposure or development process of conventional photolithography. [38] Moreover, it does not require high-temperature heat treatment and complicated transferring, Metal-network electrodes (MNEs) are excellent substitutes to the brittle and expensive indium tin oxide (ITO) films for flexible and transparent electronic devices. For a high transmittance and low resistivity, highly ordered metal wire arrays with suitable gap and width are essential. Here, high-orderly and dimension-controllable ultrathin/conformal MNEs are fabricated on µm thick/curved substrate via programmable electrohydrodynamic (EHD) lithography. By employing EHD direct-writing, large-scale high-resolution photoresist micro/nano-pattern can be digitally printed on ultrathin/curved substrates, as the digital mask in chemical etching ...

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Size‐Controlled Graphene Nanodot Arrays/ZnO Hybrids for High‐Performance UV Photodetectors

Cited by 75 publications

References 53 publications

Recent Progress on Photomultiplication Type Organic Photodetectors

Recent Progress on Photomultiplication Type Organic Photodetectors

Self‐Polarized BaTiO₃ for Greatly Enhanced Performance of ZnO UV Photodetector by Regulating the Distribution of Electron Concentration

High‐Performance, Micrometer Thick/Conformal, Transparent Metal‐Network Electrodes for Flexible and Curved Electronic Devices

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Size‐Controlled Graphene Nanodot Arrays/ZnO Hybrids for High‐Performance UV Photodetectors

Cited by 75 publications

References 53 publications

Recent Progress on Photomultiplication Type Organic Photodetectors

Recent Progress on Photomultiplication Type Organic Photodetectors

Self‐Polarized BaTiO3 for Greatly Enhanced Performance of ZnO UV Photodetector by Regulating the Distribution of Electron Concentration

High‐Performance, Micrometer Thick/Conformal, Transparent Metal‐Network Electrodes for Flexible and Curved Electronic Devices

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Product

Resources

About

Self‐Polarized BaTiO₃ for Greatly Enhanced Performance of ZnO UV Photodetector by Regulating the Distribution of Electron Concentration