A Tunable Polarization Field for Enhanced Performance of Flexible BaTiO₃@TiO₂ Nanofiber Photodetector by Suppressing Dark Current to pA Level

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(15)

Published: Jan. 20, 2023

Abstract The flexible titanium dioxide (TiO 2 ) nanofibers (NFs) film are promising candidates for high‐performance wearable optoelectronic devices. However, the TiO ultraviolet photodetectors (UV PDs) generally suffer from low photosensitivity, which limits practical applications. Herein, a (TO) NFs photodetector integrated by ferroelectric BaTiO 3 (BTO) is developed via electrospinning technology with double sprinklers and in situ heat treatment. Compared TO PD poor on/off ratio ≈44, BTO@TO PD‐2 exhibits an excellent of ≈1.5 × 10 4 due to dramatically restrained dark current. ultralow current (pA level) attributed depletion photogenerated carriers space high‐resistance state induced downward self‐polarization field NFs. domain larger orientation polarized stronger modify directional transport enhances band bending level, improves photocurrent device. special structure woven nanofiber will provide approach improving performance photodetectors.

Language: Английский

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Light‐Induced Bipolar Photoresponse with Amplified Photocurrents in an Electrolyte‐Assisted Bipolar p–n Junction

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(28)

Published: March 13, 2023

The p-n junction with bipolar characteristics sets the fundamental unit to build electronics while its unique rectification behavior constrains degree of carrier tunability for expanded functionalities. Herein, a bipolar-junction photoelectrode employed gallium nitride (GaN) homojunction nanowire array that operates in electrolyte is reported, demonstrating photoresponse controlled by different wavelengths light. Significantly, rational decoration ruthenium oxides (RuOx ) layer on nanowires guided theoretical modeling, resulting RuOx /p-n GaN exhibits unambiguously boosted an enhancement 775% and 3000% positive negative photocurrents, respectively, compared pristine nanowires. loading surface optimizes band bending, which facilitates charge transfer across GaN/electrolyte interface, meanwhile promoting efficiency redox reaction both hydrogen evolution oxygen corresponds respectively. Finally, dual-channel optical communication system incorporated such constructed using only one decode dual-band signals encrypted property. proposed device architecture presents viable route manipulate dynamics development plethora multifunctional optoelectronic devices future sensing, communication, imaging systems.

Language: Английский

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Bidirectional and Dual‐Mode Organic Photodetector Enables Secure Ultraviolet Communication

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(31)

Published: April 20, 2023

Abstract Traditional optical communication mode with single‐band photodetector depicts terrible confidentiality and it depends on sophisticated cryptography schemes to obtain a secure process. Dual‐band photodetectors have potential realize straightforward encryption strategy. However, previous reports of dual‐band organic (OPD) relied the multi‐stacked photosensitive layers thus there remain challenges in spectral matching interfaces contacting. Here, structurally simple bidirectional UV–vis OPD is proposed, single layer sitting between electrodes. By elaborately regulating field distribution vertical phase segregation bulk heterojunction (BHJ), this presents completely distinct response ranges under illuminations. Finally, outputs outstanding self‐powered UV vis responsivities (up 30 50 mA W −1 ) as light illuminates from forward backward direction, respectively. In addition, stable reliable system realized based where conveys valid information further superimposes for encryption. This design concept offers alternative achieving varied windows opens up novel method, which has be applied close‐range private

Language: Английский

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Soft Electronics for Health Monitoring Assisted by Machine Learning

Nano-Micro Letters, Journal Year: 2023, Volume and Issue: 15(1)

Published: March 15, 2023

Abstract Due to the development of novel materials, past two decades have witnessed rapid advances soft electronics. The electronics huge potential in physical sign monitoring and health care. One important advantages is forming good interface with skin, which can increase user scale improve signal quality. Therefore, it easy build specific dataset, performance machine learning algorithm. At same time, assistance algorithm, become more intelligent realize real-time analysis diagnosis. machining algorithms complement each other very well. It indubitable that will bring us a healthier world near future. this review, we give careful introduction about new material, physiological detected by devices, devices assisted Some materials be discussed such as two-dimensional carbon nanotube, nanowire, nanomesh, hydrogel. Then, sensors according types (pulse, respiration, human motion, intraocular pressure, phonation, etc.). After that, various reviewed, including some classical powerful neural network algorithms. Especially, device introduced carefully. Finally, outlook, challenge, conclusion system powered algorithm discussed.

Language: Английский

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Deterministic Fabrication and Quantum‐Well Modulation of Phase‐Pure 2D Perovskite Heterostructures for Encrypted Light Communication

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(29)

Published: May 16, 2024

Deterministic integration of phase-pure Ruddlesden-Popper (RP) perovskites has great significance for realizing functional optoelectronic devices. However, precise fabrications artificial perovskite heterostructures with pristine interfaces and rational design over electronic structure configurations remain a challenge. Here, the controllable synthesis large-area ultrathin single-crystalline RP nanosheets deterministic fabrication arbitrary 2D vertical are reported. The exhibit intriguing dual-peak emission phenomenon dual-band photoresponse characteristic. Importantly, interlayer energy transfer behaviors from wide-bandgap component to narrow-bandgap modulated by comprising quantum wells thoroughly revealed. Functional nanoscale photodetectors further constructed based on heterostructures. Moreover, combining characteristic double-beam irradiation modes, introducing an encryption algorithm mechanism, light communication system high security reliability is achieved. This work can greatly promote development heterogeneous technologies perovskites, could provide competitive candidate advanced integrated optoelectronics.

Language: Английский

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Recent Advances in Materials, Structures, and Applications of Flexible Photodetectors

Advanced Electronic Materials, Journal Year: 2023, Volume and Issue: 9(10)

Published: July 26, 2023

Abstract Flexible photodetectors (FPDs), which provide excellent advantages such as great wearability, portability, even implantability, have attracted tremendous interest in wearable healthcare monitoring, bendable imaging sensors, portable optical communication, etc. Recently, organic and perovskite‐based photoactive materials been considered promising candidates for FPDs due to their superior optoelectronic performance, appealing mechanical flexibility, low‐temperature solution processability, cost‐effectiveness. In this review, the milestone progress of organic, perovskite, organic‐perovskite hybrid‐based applications artificial intelligence are summarized. First, a brief introduction device configurations, working principles, key parameters presented. Subsequently, functional FPDs, especially flexible hybrids, summarized analyzed. More importantly, representative summarized, including communication. The outlook challenges field proposed at end. purpose review is not only elaborate on fundamental design principles but also serve roadmap next‐generation sensing technologies.

Language: Английский

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Recent advances in 2D transition metal dichalcogenide-based photodetectors: a review

Nanoscale, Journal Year: 2024, Volume and Issue: 16(5), P. 2097 - 2120

Published: Jan. 1, 2024

Two-dimensional (2D) transition metal dichalcogenides (TMDs) have emerged as a highly promising platform for the development of photodetectors (PDs) owing to their remarkable electronic and optoelectronic properties.

Language: Английский

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A bionic self-driven retinomorphic eye with ionogel photosynaptic retina

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: April 10, 2024

Bioinspired bionic eyes should be self-driving, repairable and conformal to arbitrary geometries. Such eye would enable wide-field detection efficient visual signal processing without requiring external energy, along with retinal transplantation by replacing dysfunctional photoreceptors healthy ones for vision restoration. A variety of artificial have been constructed hemispherical silicon, perovskite heterostructure photoreceptors, but creating zero-powered retinomorphic system transplantable features remains elusive. By combining neuromorphic principle ionoelastomer engineering, we demonstrate a self-driven elastomeric retina made ionogel heterojunction as photoreceptors. The receptor driven photothermoelectric effect shows photoperception broadband light (365 970 nm), wide field-of-view (180°) photosynaptic (paired-pulse facilitation index, 153%) behaviors biosimilar learning. are any complex surface, enabling restoration dynamic optical imaging motion tracking.

Language: Английский

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All-solution-processed ultraflexible wearable sensor enabled with universal trilayer structure for organic optoelectronic devices

Science Advances, Journal Year: 2024, Volume and Issue: 10(15)

Published: April 10, 2024

All-solution-processed organic optoelectronic devices can enable the large-scale manufacture of ultrathin wearable electronics with integrated diverse functions. However, complex multilayer-stacking device structure optoelectronics poses challenges for scalable production. Here, we establish all-solution processes to fabricate a wearable, self-powered photoplethysmogram (PPG) sensor. We achieve comparable performance and improved stability compared reference evaporated electrodes by using trilayer applicable photovoltaics, photodetectors, light-emitting diodes. The PPG sensor array based on all-solution-processed diodes photodetectors be fabricated large-area substrate long storage stability. integrate it large-area, solar module realize health monitoring system. high-throughput electronic functions substrates optoelectronics. Our findings advance integrating

Language: Английский

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2D Materials‐Based Photodetectors with Bi‐Directional Responses in Enabling Intelligent Optical Sensing

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 19, 2025

Abstract With the rapid advancement of 2D material‐based optoelectronic devices, significant progress is made in development all‐optical logic synaptic biomimetic and multidimensional detection systems. As entering to high‐speed information era, there an urgent demand for complex, compact, multifunctional, low‐energy, intelligent sensing chips. Examining evolution current technologies reveals a parallel bipolar response mechanisms‐from simple positive negative responses more intricate inhibition‐promotion dynamics with persistent characteristics. This significantly broadens their applications devices. Moreover, compared unipolar responses, complex offer greater flexibility adaptation unique one‐to‐one mapping high‐dimensional parameters such as polarization, phase, spectrum, positioning them promising candidates breakthroughs resolution. In this review, design strategies are comprehensively explored various materials, highlighting deep advanced fields. It aimed review provide broad overview bi‐directional mechanisms, offering inspiration designing next generation

Language: Английский

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