Enabling low-drift flexible perovskite photodetectors by electrical modulation for wearable health monitoring and weak light imaging

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: Aug. 16, 2023

Metal halide perovskites are promising for next-generation flexible photodetectors owing to their low-temperature solution processability, mechanical flexibility, and excellent photoelectric properties. However, the defects notorious ion migration in polycrystalline metal often lead high unstable dark current, thus deteriorating detection limit long-term operations. Here, we propose an electrical field modulation strategy significantly reduce current of perovskites-based photodetector more than 1000 times (from ~5 nA pA). Meanwhile, is effectively suppressed, shows a continuous operational stability (~8000 s) with low signal drift (~4.2 × 10-4 pA per second) ultralow (~1.3 10-5 second). Benefitting from strategy, signal-to-noise ratio wearable photoplethysmography sensor active-matrix array weak light imaging successfully demonstrated. This work offers universal improve performance image applications.

Language: Английский

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3D‐Printed Micro/Nano‐Scaled Mechanical Metamaterials: Fundamentals, Technologies, Progress, Applications, and Challenges

Small, Journal Year: 2023, Volume and Issue: 19(29)

Published: April 7, 2023

Micro/nano-scaled mechanical metamaterials have attracted extensive attention in various fields attributed to their superior properties benefiting from rationally designed micro/nano-structures. As one of the most advanced technologies 21st century, additive manufacturing (3D printing) opens an easier and faster path for fabricating micro/nano-scaled with complex structures. Here, size effect at micro/nano scales is introduced first. Then, fabricate are introduced. The latest research progress on also reviewed according type materials. In addition, structural functional applications further summarized. Finally, challenges, including 3D printing technologies, novel material development, innovative design, discussed, future perspectives provided. review aims provide insight into development 3D-printed metamaterials.

Language: Английский

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Self‐Powered and Flexible Photodetector with High Polarization Sensitivity Based on MAPbBr₃–MAPbI₃ Microwire Lateral Heterojunction

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 32(45)

Published: Sept. 2, 2022

Abstract Assembling perovskites into heterojunctions is an effective approach to achieve high‐performance photodetectors. Compared with vertical heterojunctions, in lateral heterojunction‐based photodetectors, the reflection loss reduced because active layer direct contact light resulting higher performance and better stability. However, perovskite–perovskite are difficult using solution methods first formed film easily dissolved by solvent of second precursor. In this study, a two‐step imprinting method developed fabricate MAPbI 3 –MAPbBr microwire realize photodetector responsivity detectivity 1207 A W −1 2.78 × 10 13 Jones, respectively. At 0 V bias, device exhibits up 233 , which more than double previously reported best results. The high‐quality heterojunction endows photodetectors ultra‐high polarization sensitivity ( I max / min = 8.2) long‐term stability, retaining 88.2% its initial even after being exposed air for 391 d.

Language: Английский

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Structural Electronic Skin for Conformal Tactile Sensing

Advanced Science, Journal Year: 2023, Volume and Issue: 10(33)

Published: Sept. 22, 2023

The conformal integration of the electronic skin on non-developable surface is in great demand for comprehensive tactile sensing robotics and prosthetics. However, current techniques still encounter obstacles achieving film-like surfaces with substantial curvatures contact pressure detection mapping. In this paper, by utilizing 3D printing technology to prepare electrode array structural component following its curvature, covering it a molded functional shell form sensitive iontronic interface, device proposed achieve high-sensitive high-fidelity mapping complicated surface, called (SES). SES prepared printed fingertip 46 units distributed curved both functions single component. By integrating smart into dexterous hand, series demonstrations are presented show dead-zone free high sensitivity, instance, 2D pulse wave monitoring robotic injection medical robot, object recognition compliant control prosthesis.

Language: Английский

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Research on manufacturing technology of nanoimprinted grating

Journal of Manufacturing Processes, Journal Year: 2024, Volume and Issue: 131, P. 891 - 909

Published: Sept. 25, 2024

Language: Английский

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In Situ Encapsulated Moiré Perovskite for Stable Photodetectors with Ultrahigh Polarization Sensitivity

Advanced Materials, Journal Year: 2022, Volume and Issue: 35(3)

Published: Nov. 7, 2022

Nanostructures provide a simple, effective, and low-cost route to enhance the light-trapping capability of optoelectronic devices. In recent years, nano-optical structures have been widely used in perovskite devices greatly device performance. However, inherent instability materials hinders practical application these nanostructured Here, situ encapsulated moiré lattice photodetectors (PDs) by two nanograting-structured soft templates with relative rotation angles is fabricated. The confinement growth nanograting leads crystal structure, which improves light-harvesting ability crystal, thereby improving PD exhibits responsivity 1026.5 A W-1 . Moiré lattice-perovskite-based maintained 95% initial performance after 223 days. After being continuously sprayed water moist for 180 min, at 95.7% its level. structure endows high polarization sensitivity Imax /Imin as 9.1.

Language: Английский

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Recent advance of high-quality perovskite nanostructure and its application in flexible photodetectors

Nanotechnology, Journal Year: 2024, Volume and Issue: 35(24), P. 242001 - 242001

Published: March 11, 2024

Abstract Flexible photodetectors (PDs) have garnered increasing attention for their potential applications in diverse fields, including weather monitoring, smart robotics, textiles, electronic eyes, wearable biomedical monitoring devices, and so on. Notably, perovskite nanostructures emerged as a promising material flexible PDs due to distinctive features, such large optical absorption coefficient, tunable band gap, extended photoluminescence decay time, high carrier mobility, low defect density, long exciton diffusion lengths, strong self-trapped effect, good mechanical flexibility, facile synthesis methods. In this review, we first introduce various methods elucidate corresponding electrical properties, encompassing quantum dots, nanocrystals, nanowires, nanobelts, nanosheets, single-crystal thin films, polycrystalline nanostructured arrays. Furthermore, the working mechanism key performance parameters of optoelectronic devices are summarized. The review also systematically compiles recent advancements based on perovskites. Finally, present current challenges prospects development nanostructures-based PDs.

Language: Английский

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Highly Efficient Photon Energy Conversion and Ultrasensitive Self-Powered Photodetection via a Monolithic p-3C-SiC Nanothin Film on p-Si/n-Si Double Junction

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(29), P. 38658 - 38668

Published: July 12, 2024

The pursuit of increased efficiency photoelectric energy conversion through optimized semiconductor structures remains highly competitive, with current results yet to align broad expectations. In this study, we discover a significant enhancement in photocurrent performance p-3C-SiC nanothin film on p-Si/n-Si double junction (DJ) heterostructure that integrates p-3C-SiC/p-Si heterojunction and homojunction. vertical (VPC) photoresponsivity exhibit substantial the DJ heterostructure, surpassing by maximum 43-fold compared p-3C-SiC/n-Si single (SJ) counterpart. layer n-Si substrate two heterostructures have similar material geometrical properties. More importantly, fabrication costs for SJ devices are comparable. Our demonstrate potential using harvesters, micro/nano electromechanical systems, sensing applications. This research may also lead creation advanced optoelectronic structures, where employing various materials achieve exceptional application concept theoretical model described work.

Language: Английский

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Constructing high-quality 1D nano/microwire hybrid structure for high-performance photodetectors based on CdSe nanobelt/perovskite microwire

Nanophotonics, Journal Year: 2023, Volume and Issue: 12(7), P. 1347 - 1357

Published: Feb. 28, 2023

All-inorganic perovskite CsPbBr

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Advances in flexible weak-light detectors based on perovskites: preparation, optimization, and application

Journal of Semiconductors, Journal Year: 2025, Volume and Issue: 46(1), P. 011608 - 011608

Published: Jan. 1, 2025

Abstract Photodetectors with weak-light detection capabilities play an indispensable role in various crucial fields such as health monitors, imaging, optical communication, and etc. Nevertheless, the of weak light signals is often severely interfered by multiple factors background light, dark noise circuit noise, making it difficult to accurately capture signals. While traditional technologies like silicon photomultiplier tubes excel sensitivity, their high cost inherent fragility restrict widespread application. Against this background, perovskite materials have rapidly emerged a research focus field photodetection due simple preparation processes exceptional optoelectronic properties. Not only are straightforward cost-effective, but more importantly, they can be flexibly integrated into flexible stretchable substrates. This characteristic significantly compensates for shortcomings rigid electronic devices specific application scenarios, opening up entirely new possibilities technology. Herein, recent advances technology reviewed. Firstly, chemical physical properties discussed, highlighting remarkable advantages detection. Subsequently, review systematically organizes techniques analyses different scenarios. Meanwhile, from two core dimensions performance improvement absorption enhancement, key strategies improving photodetectors explored. Finally, concludes brief summary discussion on potential challenges that may arise further development devices.

Language: Английский

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