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High‐Performance Flexible Photodetectors based on High‐Quality Perovskite Thin Films by a Vapor–Solution Method
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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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Jongwon Yoon Woojin Park Ga‐Yeong Bae Yonghun Kim Hun Soo Jang Yujun Hyun Sung Kwan Lim Yung Ho Kahng Woong‐Ki Hong Byoung Hun Lee Heung Cho Ko 《Small (Weinheim an der Bergstrasse, Germany)》2013,9(19):3295-3300
A highly flexible and transparent transistor is developed based on an exfoliated MoS2 channel and CVD‐grown graphene source/drain electrodes. Introducing the 2D nanomaterials provides a high mechanical flexibility, optical transmittance (~74%), and current on/off ratio (>104) with an average field effect mobility of ~4.7 cm2 V?1 s?1, all of which cannot be achieved by other transistors consisting of a MoS2 active channel/metal electrodes or graphene channel/graphene electrodes. In particular, a low Schottky barrier (~22 meV) forms at the MoS2/graphene interface, which is comparable to the MoS2/metal interface. The high stability in electronic performance of the devices upon bending up to ±2.2 mm in compressive and tensile modes, and the ability to recover electrical properties after degradation upon annealing, reveal the efficacy of using 2D materials for creating highly flexible and transparent devices. 相似文献
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Qiyuan He Zhiyuan Zeng Zongyou Yin Hai Li Shixin Wu Xiao Huang Hua Zhang 《Small (Weinheim an der Bergstrasse, Germany)》2012,8(19):2994-2999
By combining two kinds of solution‐processable two‐dimensional materials, a flexible transistor array is fabricated in which MoS2 thin film is used as the active channel and reduced graphene oxide (rGO) film is used as the drain and source electrodes. The simple device configuration and the 1.5 mm‐long MoS2 channel ensure highly reproducible device fabrication and operation. This flexible transistor array can be used as a highly sensitive gas sensor with excellent reproducibility. Compared to using rGO thin film as the active channel, this new gas sensor exhibits much higher sensitivity. Moreover, functionalization of the MoS2 thin film with Pt nanoparticles further increases the sensitivity by up to ~3 times. The successful incorporation of a MoS2 thin‐film into the electronic sensor promises its potential application in various electronic devices. 相似文献
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Jingjing Wang Chao Luo Tao Gao Alex Langrock Alice C. Mignerey Chunsheng Wang 《Small (Weinheim an der Bergstrasse, Germany)》2015,11(4):473-481
Molybdenum disulfide (MoS2) is a promising anode for high performance sodium‐ion batteries due to high specific capacity, abundance, and low cost. However, poor cycling stability, low rate capability and unclear electrochemical reaction mechanism are the main challenges for MoS2 anode in Na‐ion batteries. In this study, molybdenum disulfide/carbon (MoS2/C) nanospheres are fabricated and used for Na‐ion battery anodes. MoS2/C nanospheres deliver a reversible capacity of 520 mAh g?1 at 0.1 C and maintain at 400 mAh g?1 for 300 cycles at a high current density of 1 C, demonstrating the best cycling performance of MoS2 for Na‐ion batteries to date. The high capacity is attributed to the short ion and electron diffusion pathway, which enables fast charge transfer and low concentration polarization. The stable cycling performance and high coulombic efficiency (~100%) of MoS2/C nanospheres are ascribed to (1) highly reversible conversion reaction of MoS2 during sodiation/desodiation as evidenced by ex‐situ X‐ray diffraction (XRD) and (2) the formation of a stable solid electrolyte interface (SEI) layer in fluoroethylene carbonate (FEC) based electrolyte as demonstrated by fourier transform infrared spectroscopy (FTIR) measurements. 相似文献
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Zhaoyang Lin Courtney Hollar Joon Sang Kang Anxiang Yin Yiliu Wang Hui‐Ying Shiu Yu Huang Yongjie Hu Yanliang Zhang Xiangfeng Duan 《Advanced materials (Deerfield Beach, Fla.)》2017,29(21)
A solid‐state thermoelectric device is attractive for diverse technological areas such as cooling, power generation and waste heat recovery with unique advantages of quiet operation, zero hazardous emissions, and long lifetime. With the rapid growth of flexible electronics and miniature sensors, the low‐cost flexible thermoelectric energy harvester is highly desired as a potential power supply. Herein, a flexible thermoelectric copper selenide (Cu2Se) thin film, consisting of earth‐abundant elements, is reported. The thin film is fabricated by a low‐cost and scalable spin coating process using ink solution with a truly soluble precursor. The Cu2Se thin film exhibits a power factor of 0.62 mW/(m K2) at 684 K on rigid Al2O3 substrate and 0.46 mW/(m K2) at 664 K on flexible polyimide substrate, which is much higher than the values obtained from other solution processed Cu2Se thin films (<0.1 mW/(m K2)) and among the highest values reported in all flexible thermoelectric films to date (≈0.5 mW/(m K2)). Additionally, the fabricated thin film shows great promise to be integrated with the flexible electronic devices, with negligible performance change after 1000 bending cycles. Together, the study demonstrates a low‐cost and scalable pathway to high‐performance flexible thin film thermoelectric devices from relatively earth‐abundant elements. 相似文献
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In Situ Fabrication of Vertical Multilayered MoS2/Si Homotype Heterojunction for High‐Speed Visible–Near‐Infrared Photodetectors
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Yan Zhang Yongqiang Yu Longfei Mi Hui Wang Zhifeng Zhu Qingyun Wu Yugang Zhang Yang Jiang 《Small (Weinheim an der Bergstrasse, Germany)》2016,12(8):1062-1071
c2D transition metal dichalcogenides (TMDCs)‐based heterostructures have been demonstrated to achieve superior light absorption and photovoltaic effects theoretically and experimentally, making them extremely attractive for realizing optoelectronic devices. In this work, a vertical multilayered n‐MoS2/n‐silicon homotype heterojunction is fabricated, which takes advantage of multilayered MoS2 grown in situ directly on plane silicon. Electrical characterization reveals that the resultant device exhibits high sensitivity to visible–near‐infrared light with responsivity up to 11.9 A W–1. Notably, the photodetector shows high‐speed response time of ≈30.5 µs/71.6 µs and capability to work under higher pulsed light irradiation approaching 100 kHz. The high response speed could be attributed to a good quality of the multilayer MoS2, as well as in situ device fabrication process. These findings suggest that the multilayered MoS2/Si homotype heterojunction have great potential application in the field of visible–near‐infrared detection and might be used as elements for construction of high‐speed integrated optoelectronic sensor circuitry. 相似文献
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Sang‐Soo Chee Dongpyo Seo Hanggyu Kim Hanbyeol Jang Seungmin Lee Seung Pil Moon Kyu Hyoung Lee Sung Wng Kim Hyunyong Choi Moon‐Ho Ham 《Advanced materials (Deerfield Beach, Fla.)》2019,31(2)
2D transition metal dichalcogenides (TMDCs) have emerged as promising candidates for post‐silicon nanoelectronics owing to their unique and outstanding semiconducting properties. However, contact engineering for these materials to create high‐performance devices while adapting for large‐area fabrication is still in its nascent stages. In this study, graphene/Ag contacts are introduced into MoS2 devices, for which a graphene film synthesized by chemical vapor deposition (CVD) is inserted between a CVD‐grown MoS2 film and a Ag electrode as an interfacial layer. The MoS2 field‐effect transistors with graphene/Ag contacts show improved electrical and photoelectrical properties, achieving a field‐effect mobility of 35 cm2 V?1 s?1, an on/off current ratio of 4 × 108, and a photoresponsivity of 2160 A W?1, compared to those of devices with conventional Ti/Au contacts. These improvements are attributed to the low work function of Ag and the tunability of graphene Fermi level; the n‐doping of Ag in graphene decreases its Fermi level, thereby reducing the Schottky barrier height and contact resistance between the MoS2 and electrodes. This demonstration of contact interface engineering with CVD‐grown MoS2 and graphene is a key step toward the practical application of atomically thin TMDC‐based devices with low‐resistance contacts for high‐performance large‐area electronics and optoelectronics. 相似文献
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Zhaofeng Zhai Bing Leng Nianjun Yang Bing Yang Lusheng Liu Nan Huang Xin Jiang 《Small (Weinheim an der Bergstrasse, Germany)》2019,15(48)
Tremendous demands for highly sensitive and selective nonenzymatic electrochemical biosensors have motivated intensive research on advanced electrode materials with high electrocatalytic activity. Herein, the 3D‐networked CuO@carbon nanowalls/diamond (C/D) architecture is rationally designed, and it demonstrates wide linear range (0.5 × 10?6–4 × 10?3 m ), high sensitivity (1650 µA cm?2 mm ?1), and low detection limit (0.5 × 10?6 m ), together with high selectivity, great long‐term stability, and good reproducibility in glucose determination. The outstanding performance of the CuO@C/D electrode can be ascribed to the synergistic effect coming from high‐electrocatalytic‐activity CuO nanoparticles and 3D‐networked conductive C/D film. The C/D film is composed of carbon nanowalls and diamond nanoplatelets; and owing to the large surface area, accessible open surfaces, and high electrical conduction, it works as an excellent transducer, greatly accelerating the mass‐ and charge‐transport kinetics of electrocatalytic reaction on the CuO biorecognition element. Besides, the vertical aligned diamond nanoplatelet scaffolds could improve structural and mechanical stability of the designed electrode in long‐term performance. The excellent CuO@C/D electrode promises potential application in practical glucose detection, and the strategy proposed here can also be extended to construct other biorecognition elements on the 3D‐networked conductive C/D transducer for various high‐performance nonenzymatic electrochemical biosensors. 相似文献
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Structurally Deformed MoS2 for Electrochemically Stable,Thermally Resistant,and Highly Efficient Hydrogen Evolution Reaction
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Yen‐Chang Chen Ang‐Yu Lu Ping Lu Xiulin Yang Chang‐Ming Jiang Marina Mariano Bryan Kaehr Oliver Lin André Taylor Ian D. Sharp Lain‐Jong Li Stanley S. Chou Vincent Tung 《Advanced materials (Deerfield Beach, Fla.)》2017,29(44)
The emerging molybdenum disulfide (MoS2) offers intriguing possibilities for realizing a transformative new catalyst for driving the hydrogen evolution reaction (HER). However, the trade‐off between catalytic activity and long‐term stability represents a formidable challenge and has not been extensively addressed. This study reports that metastable and temperature‐sensitive chemically exfoliated MoS2 (ce‐MoS2) can be made into electrochemically stable (5000 cycles), and thermally robust (300 °C) while maintaining synthetic scalability and excellent catalytic activity through physical‐transformation into 3D structurally deformed nanostructures. The dimensional transition enabled by a high throughput electrohydrodynamic process provides highly accessible, and electrochemically active surface area and facilitates efficient transport across various interfaces. Meanwhile, the hierarchically strained morphology is found to improve electronic coupling between active sites and current collecting substrates without the need for selective engineering the electronically heterogeneous interfaces. Specifically, the synergistic combination of high strain load stemmed from capillarity‐induced‐self‐crumpling and sulfur (S) vacancies intrinsic to chemical exfoliation enables simultaneous modulation of active site density and intrinsic HER activity regardless of continuous operation or elevated temperature. These results provide new insights into how catalytic activity, electrochemical‐, and thermal stability can be concurrently enhanced through the physical transformation that is reminiscent of nature, in which properties of biological materials emerge from evolved dimensional transitions. 相似文献
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Eden Morales‐Narváez Luis Baptista‐Pires Alejandro Zamora‐Gálvez Arben Merkoçi 《Advanced materials (Deerfield Beach, Fla.)》2017,29(7)
The main properties of graphene derivatives facilitating optical and electrical biosensing platforms are discussed, along with how the integration of graphene derivatives, plastic, and paper can lead to innovative devices in order to simplify biosensing technology and manufacture easy‐to‐use, yet powerful electrical or optical biosensors. Some crucial issues to be overcome in order to bring graphene‐based biosensors to the market are also underscored. 相似文献