共查询到20条相似文献，搜索用时 15 毫秒
1.
Haoxuan Sun Wei Tian Fengren Cao Jie Xiong Liang Li 《Advanced materials (Deerfield Beach, Fla.)》2018,30(21)
Self‐powered flexible photodetectors without an external power source can meet the demands of next‐generation portable and wearable nanodevices; however, the performance is far from satisfactory becuase of the limited match of flexible substrates and light‐sensitive materials with proper energy levels. Herein, a novel self‐powered flexible fiber‐shaped photodetector based on double‐twisted perovskite–TiO2–carbon fiber and CuO–Cu2O–Cu wire is designed and fabricated. The device shows an ultrahigh detectivity of 2.15 × 1013 Jones under the illumination of 800 nm light at zero bias. CuO–Cu2O electron block bilayer extends response range of perovskite from 850 to 1050 nm and suppresses dark current down to 10?11 A. The fast response speed of less than 200 ms is nearly invariable after dozens of cycles of bending at the extremely 90 bending angle, demonstrating excellent flexibility and bending stability. These parameters are comparable and even better than reported flexible and even rigid photodetectors. The present results suggest a promising strategy to design photodetectors with integrated function of self‐power, flexibility, and broadband response. 相似文献
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Siu‐Fung Leung Kang‐Ting Ho Po‐Kai Kung Vincent K. S. Hsiao Husam N. Alshareef Zhong Lin Wang Jr‐Hau He 《Advanced materials (Deerfield Beach, Fla.)》2018,30(8)
Flexible and self‐powered photodetectors (PDs) are highly desirable for applications in image sensing, smart building, and optical communications. In this paper, a self‐powered and flexible PD based on the methylammonium lead iodide (CH3NH3PBI3) perovskite is demonstrated. Such a self‐powered PD can operate even with irregular motion such as human finger tapping, which enables it to work without a bulky external power source. In addition, with high‐quality CH3NH3PBI3 perovskite thin film fabricated with solvent engineering, the PD exhibits an impressive detectivity of 1.22 × 1013 Jones. In the self‐powered voltage detection mode, it achieves a large responsivity of up to 79.4 V mW?1 cm?2 and a voltage response of up to ≈90%. Moreover, as the PD is made of flexible and transparent polymer films, it can operate under bending and functions at 360 ° of illumination. As a result, the self‐powered, flexible, 360 ° omnidirectional perovskite PD, featuring high detectivity and responsivity along with real‐world sensing capability, suggests a new direction for next‐generation optical communications, sensing, and imaging applications. 相似文献
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Xin Yu Zhenhuan Zhao Jian Zhang Weibo Guo Jichuan Qiu Deshuai Li Zhou Li Xiaoning Mou Linlin Li Aixue Li Hong Liu 《Small (Weinheim an der Bergstrasse, Germany)》2016,12(20):2759-2767
Self‐powered UV photodetectors based on TiO2 nanotree arrays have captured much attention in recent years because of their many advantages. In this work, rutile/anatase TiO2 (R/A‐TiO2) heterostructured nanotree arrays are fabricated by assembling anatase nanowires as branches on rutile nanorods. External quantum efficiencies as high as 90% are reached at 325 nm. These high quantum efficiencies are related to the higher amount of light harvesting due to the larger surface area, the better separation ability of the photogenerated carriers by the rutile/anatase heterostructure, and the faster electron transport, related to the 1D nanostructure and lattice connection at the interface of the two kinds of TiO2. Furthermore, a self‐powered wireless UV photodetector is shown with excellent wireless detection performance. Such devices will enable significant advances for next‐generation photodetection and photosensing applications. 相似文献
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High‐Performance Flexible Photodetectors based on High‐Quality Perovskite Thin Films by a Vapor–Solution Method 
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下载免费PDF全文 Wei Hu Wei Huang Shuzhen Yang Xiao Wang Zhenyu Jiang Xiaoli Zhu Hong Zhou Hongjun Liu Qinglin Zhang Xiujuan Zhuang Junliang Yang Dong Ha Kim Anlian Pan 《Advanced materials (Deerfield Beach, Fla.)》2017,29(43)
Organometal halide perovskites are new light‐harvesting materials for lightweight and flexible optoelectronic devices due to their excellent optoelectronic properties and low‐temperature process capability. However, the preparation of high‐quality perovskite films on flexible substrates has still been a great challenge to date. Here, a novel vapor–solution method is developed to achieve uniform and pinhole‐free organometal halide perovskite films on flexible indium tin oxide/poly(ethylene terephthalate) substrates. Based on the as‐prepared high‐quality perovskite thin films, high‐performance flexible photodetectors (PDs) are constructed, which display a nR value of 81 A W?1 at a low working voltage of 1 V, three orders higher than that of previously reported flexible perovskite thin‐film PDs. In addition, these flexible PDs exhibit excellent flexural stability and durability under various bending situations with their optoelectronic performance well retained. This breakthrough on the growth of high‐quality perovskite thin films opens up a new avenue to develop high‐performance flexible optoelectronic devices. 相似文献
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Skin‐inspired wearable devices hold great potentials in the next generation of smart portable electronics owing to their intriguing applications in healthcare monitoring, soft robotics, artificial intelligence, and human–machine interfaces. Despite tremendous research efforts dedicated to judiciously tailoring wearable devices in terms of their thickness, portability, flexibility, bendability as well as stretchability, the emerging Internet of Things demand the skin‐interfaced flexible systems to be endowed with additional functionalities with the capability of mimicking skin‐like perception and beyond. This review covers and highlights the latest advances of burgeoning multifunctional wearable electronics, primarily including versatile multimodal sensor systems, self‐healing material‐based devices, and self‐powered flexible sensors. To render the penetration of human‐interactive devices into global markets and households, economical manufacturing techniques are crucial to achieve large‐scale flexible systems with high‐throughput capability. The booming innovations in this research field will push the scientific community forward and benefit human beings in the near future. 相似文献
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Hongjun Chen Meng Zhang Renheng Bo Chog Barugkin Jianghui Zheng Qingshan Ma Shujuan Huang Anita W. Y. Ho‐Baillie Kylie R. Catchpole Antonio Tricoli 《Small (Weinheim an der Bergstrasse, Germany)》2018,14(7)
Hybrid halide perovskite is one of the promising light absorber and is intensively investigated for many optoelectronic applications. Here, the first prototype of a self‐powered inorganic halides perovskite for chemical gas sensing at room temperature under visible‐light irradiation is presented. These devices consist of porous network of CsPbBr3 (CPB) and can generate an open‐circuit voltage of 0.87 V under visible‐light irradiation, which can be used to detect various concentrations of O2 and parts per million concentrations of medically relevant volatile organic compounds such as acetone and ethanol with very quick response and recovery time. It is observed that O2 gas can passivate the surface trap sites in CPB and the ambipolar charge transport in the perovskite layer results in a distinct sensing mechanism compared with established semiconductors with symmetric electrical response to both oxidizing and reducing gases. The platform of CPB‐based gas sensor provides new insights for the emerging area of wearable sensors for personalized and preventive medicine. 相似文献
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Weichun Huang Ye Zhang Qi You Pu Huang Yunzheng Wang Ziyin N. Huang Yanqi Ge Leiming Wu Zhijun Dong Xiaoyu Dai Yuanjiang Xiang Jianqing Li Xiuwen Zhang Han Zhang 《Small (Weinheim an der Bergstrasse, Germany)》2019,15(23)
Non‐layered tellurium (Te) is a promising material for applications in transistor and optoelectronic devices for its advantages in excellent intrinsic electronic and optoelectronic properties. However, the poor photodetection performance and relatively uncertain stability of tellurene under ambient conditions greatly limit the practical applications. In order to improve the performance of tellurene‐based materials, Te@Se roll‐to‐roll nanotubes with different selenium (Se) contents synthesized by epitaxial growth of Se on Te nanotubes are, for the first time, employed to fabricate working electrodes for photoelectrochemical (PEC)‐type broadband photodetection. They exhibit not only a preferably enhanced capacity for self‐powered broadband photodetection but also significantly improved photocurrent density and stability in various aqueous environments (HCl, NaCl, and KOH solutions), compared to tellurene‐based photodetectors. It is anticipated that the present work can open up new possibilities for high‐performance tellurene‐based optoelectronic devices. 相似文献
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Ivy M. Asuo Paul Fourmont Ibrahima Ka Dawit Gedamu Soraya Bouzidi Alain Pignolet Riad Nechache Sylvain G. Cloutier 《Small (Weinheim an der Bergstrasse, Germany)》2019,15(1)
Hybrid organic–inorganic perovskites have shown exceptional semiconducting properties and microstructural versatility for inexpensive, solution‐processable photovoltaic and optoelectronic devices. In this work, an all‐solution‐based technique in ambient environment for highly sensitive and high‐speed flexible photodetectors using high crystal quality perovskite nanowires grown on Kapton substrate is presented. At 10 V, the optimized photodetector exhibits a responsivity as high as 0.62 A W?1, a maximum specific detectivity of 7.3 × 1012 cm Hz1/2 W?1, and a rise time of 227.2 µs. It also shows remarkable photocurrent stability even beyond 5000 bending cycles. Moreover, a deposition of poly(methyl methacrylate) (PMMA) as a protective layer on the perovskite yields significantly better stability under ambient air operation: the PMMA‐protected devices are stable for over 30 days. This work demonstrates a cost‐effective fabrication technique for high‐performance flexible photodetectors and opens opportunities for research advancements in broadband and large‐scale flexible perovskite‐based optoelectronic devices. 相似文献
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Sabina M. Hatch Joe Briscoe Steve Dunn 《Advanced materials (Deerfield Beach, Fla.)》2013,25(6):867-871
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《Advanced Materials Technologies》2018,3(6)
Harvesting and utilizing the wasted ambient environmental energy can be a feasible solution for continuous operation of distributed sensors that require sustainable power sources. Vibrational mechanical energy is the most ubiquitous energy source in the environment. Therefore, it is important to develop a method to efficiently collect vibrational energy. Here, a hybridized nanogenerator based on triboelectric–piezoelectric–electromagnetic effects for the highly efficient conversion of vibrational mechanical energy into electricity is reported. Integrating with transformers and rectifiers, the hybridized nanogenerator can deliver a power density up to 100 W m−3. Through a power management circuit integrated into the hybridized nanogenerator, a continuous direct current (DC) output is achieved, providing sufficient DC power for driving a radio‐frequency wireless tire‐pressure monitoring system and other conventional electronics. This work takes a significant step toward ubiquitous vibrational energy harvesting and its potential applications in self‐powered wireless sensor networks. 相似文献
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《Advanced Materials Technologies》2017,2(12)
Semiconductor materials based UV photodetectors can be operated via photovoltaic effect by converting UV light into electric signals. Recent studies have been focused on how to fabricate excellent semiconductor materials based photodetectors through construction of heterojunctions, which may not be suitable for practical large‐scale devices due to the high cost and sophisticated fabrication process. Here, by utilizing naturally existing temperature change of UV illumination and the pyroelectric effect of ferroelectric materials, a novel self‐powered UV photodetector based on Pb(Zr,Ti)O3 (PZT) material is presented through a simple fabricating process, which can be well utilized to detect 365 nm UV light by using light‐induced temperature variation. Under a temperature change rate of 2.40 K s−1, the voltage response and the corresponding responsivity can be enhanced by larger than 6600% as compared with that of individual UV light illumination. This study provides a feasible solution to realize self‐powered UV light detection by utilizing light‐induced pyroelectric effect in PZT. 相似文献
14.
Yi Ning Zhiming Zhang Feng Teng Xiaosheng Fang 《Small (Weinheim an der Bergstrasse, Germany)》2018,14(13)
A novel self‐powered UV photodetector based on electrospun ZnO nanofiber arrays is introduced. Aligned pure ZnO nanofibers and Ag‐doped p‐type ZnO nanofibers are processed perpendicular to each other, and p–n junction arrays of ZnO nanofibers are fabricated as a result. Owing to the intrinsic intervals between nanofibers, the device is fully transparent on quartz substrate. Various characterization methods including TEM, XRD, and XPS are used to testify the existence form of Ag element in ZnO nanofibers, and a field effect transistor is constructed to judge their conductivity. It is discovered that the Ag doping process not only transforms ZnO to p‐type conductivity, making it possible to build this self‐powered photodetector, but also forms Ag nanoparticles in ZnO nanofibers and thus helps reduce the response time. Benefiting from the abovementioned dual effects, this UV detector is found to have an enhanced performance, with the on–off ratio up to 104 at zero bias and a rather short rise/decay time of 3.90 s/4.71 s. 相似文献
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Zhiyong Liu Xingyue Liu Bo Sun Xianhua Tan Haibo Ye Jianxin Zhou Zirong Tang Tielin Shi Guanglan Liao 《Advanced Materials Technologies》2020,5(8)
Photodetectors are essential parts of wireless optical communication system for obtaining high fidelity signal transmission, which mainly relies on expensive and energy‐consuming Si, GaN, and InGaAs based photodiodes. The emerging organic–inorganic metal halide perovskite materials, with the merits of low‐cost, strong optical absorption, superior charge transport, and so on, are widely investigated in photodetection applications. Herein, a Cu ion induced p‐type doping strategy for perovskite film is proposed to facilitate hole transport, passivate trap states, avoid charge accumulation, and suppress recombination of photogenerated carriers, contributing to an enhanced photoelectric performance for self‐powered hole‐conductor‐free devices. The optimal device shows a highest responsivity of 0.37 A W−1, detectivity of 1.06 × 1012 Jones, linear dynamic range of over 101 dB, and an ultimate photoresponse rate approaching 5 µs. Moreover, an optical communication system integrated with the perovskite photodetector as light signal receiver for transmitting digital signals is demonstrated, in which characters can be transmitted accurately, and audio signal is recovered with high fidelity. The results suggest that with proper chemical modification, perovskite materials are promising alternative to inorganic semiconductors for efficient photodetection in advanced integrated optical communication system. 相似文献
17.
Daozhi Shen Ming Xiao Guisheng Zou Lei Liu Walter W. Duley Y. Norman Zhou 《Advanced materials (Deerfield Beach, Fla.)》2018,30(18)
Most state‐of‐the‐art electronic wearable sensors are powered by batteries that require regular charging and eventual replacement, which would cause environmental issues and complex management problems. Here, a device concept is reported that can break this paradigm in ambient moisture monitoring—a new class of simple sensors themselves can generate moisture‐dependent voltage that can be used to determine the ambient humidity level directly. It is demonstrated that a moisture‐driven electrical generator, based on the diffusive flow of water in titanium dioxide (TiO2) nanowire networks, can yield an output power density of up to 4 µW cm?2 when exposed to a highly moist environment. This performance is two orders of magnitude better than that reported for carbon‐black generators. The output voltage is strongly dependent on humidity of ambient environment. As a big breakthrough, this new type of device is successfully used as self‐powered wearable human‐breathing monitors and touch pads, which is not achievable by any existing moisture‐induced‐electricity technology. The availability of high‐output self‐powered electrical generators will facilitate the design and application of a wide range of new innovative flexible electronic devices. 相似文献
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Kyoung‐Yong Chun Young Jun Son Eun‐Seok Jeon Sehan Lee Chang‐Soo Han 《Advanced materials (Deerfield Beach, Fla.)》2018,30(12)
Highly efficient human skin systems transmit fast adaptive (FA) and slow adaptive (SA) pulses selectively or consolidatively to the brain for a variety of external stimuli. The integrated analysis of these signals determines how humans perceive external physical stimuli. Here, a self‐powered mechanoreceptor sensor based on an artificial ion‐channel system combined with a piezoelectric film is presented, which can simultaneously implement FA and SA pulses like human skin. This device detects stimuli with high sensitivity and broad frequency band without external power. For the feasibility study, various stimuli are measured or detected. Vital signs such as the heart rate and ballistocardiogram can be measured simultaneously in real time. Also, a variety of stimuli such as the mechanical stress, surface roughness, and contact by a moving object can be distinguished and detected. This opens new scientific fields to realize the somatic cutaneous sensor of the real skin. Moreover, this new sensing scheme inspired by natural sensing structures is able to mimic the five senses of living creatures. 相似文献