MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2022
·
IF 4.644
Zihan Yin,Yujie Shan,Mingyan Yu,Lun Yang,Jiaming Song,Peng Hu,Feng Teng
As a commonly used substrate and matrix material in the construction of high performance ultraviolet photodetector, ZnO nanorod arrays have attached much attention due to their efficiency electron transmission channels and high stability. However, they also have the problem of slow response speed inevitably. In this work, TiO 2 /ZnO nanorod arrays heterojunction structure was prepared and used to construct ultraviolet photodetector. The obtained heterojunction photodetector has a higher on/off ratio (>1000) and shorter rise/decay time (6.1/3.7 s) compared with that of photodetector based on ZnO nanorod arrays (on/off ratio ∼10 and decay time >20 s). The enhanced response speed is caused by the traps of the electron in TiO 2 layer, which can accelerate the decay of current in the OFF state. The obtained results provide a new sight for the further development of the optoelectronic devices based on ZnO nanorod arrays in future.
研究领域:
材料科学
·
光电材料
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Yue Tian,Ying Li,Chuqiao Hu,Yaqian Yang,Di Chen,Guozhen Shen
Weak-light detection technology is widely used in various fields, including industry, high-energy physics, precision analysis, and reflection imaging. Metal–semiconductor–metal (MSM) photodetectors demonstrate high detectivity and high response speed and are one of the suitable structures for the preparation of weak-light detectors. However, traditional MSM photodetectors tend to exhibit high dark currents, which are not conducive to performance improvement. Here, a MXene–Cs3Bi2I9–MXene weak-light detector is proposed. Based on the MXene–Cs3Bi2I9 Schottky junctions, the dark current is reduced by 2 orders of magnitude and the responsivity is significantly improved compared with the traditional Cr/Au–Cs3Bi2I9–Cr/Au MSM photodetector. The device demonstrates excellent photodetection capacity with a photoresponsivity of 6.45 A W–1, a specific detectivity of 9.45 × 1011 Jones, and a fast response speed of 0.27/2.32 ms. Especially, the device yielded a superior weak-light detectable limit of 10.66 nW cm–2 and demonstrated excellent optical communication capability. Moreover, such a flexible device shows little degradation in photodetection performance after extreme bending for 4500 cycles, proving remarkable bending endurance and flexibility. The obtained results highlight the great potential of such Cs3Bi2I9/MXene devices as a stable and environmentally friendly candidate for weak-light detection.
研究领域:
材料科学
·
光电检测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Yingming Zhao,Su Pan,Yanfen Li,Zhibo Sun,Zhengnan Yuan,Yipeng Huo,Man-Chun Tseng,Lei Lu,Valerii Vashchenko,Abhishek Kumar Srivastava,Hoi-Sing Kwok,Xingwu Chen,Xin Zhang,Shengdong Zhang,Lixuan Chen
There are a series of polyimide material synthesized and studied with different dianhydride and diamine structures. By exploring the structural variations of these materials and their surface energy characteristics, we successfully obtained ferroelectric liquid crystal devices exhibiting exceptional optical and electrical properties. Notably, our findings highlight that a specific polyimide material comprised of dianhydride with a benzene ring structure and diamine with a long-chain amino structure demonstrates remarkable achievements, including a maximum contrast of 872 and a rapid response speed of less than 0.1 ms. These results establish the superiority of this particular polyimide material over its commercially available counterparts. Additionally, the optical characteristics of various polyimide materials were examined by establishing a correlation between these properties and the surface energy of the materials. This research presents a novel approach to developing alignment materials suitable for ferroelectric liquid crystal applications. The implications of our findings are of great significance in driving advancements in field-sequential-color display devices with high pixels per inch in the ferroelectric liquid crystal field .
研究领域:
材料科学
·
显示技术
✓ 已验证
产品关联
DOI
高影响因子
THIN SOLID FILMS
·
2024
·
IF 2
Rui Ji,Yuan-Qiu-Qiang Yi,Xiaohai Wang,Xinzhou Wu,Chengchao Huang,Wenming Su,Zheng Cui
The preparation process plays a significant role in manipulating the morphology of organic electrochromic polymer (ECP) films, thus improving the stability of the prepared devices. In this work, the influence of thermal annealing (TA) temperatures on ECP films has been systematically investigated. The relationship between the TA temperature and the effective overpotential was determined. It was found that the TA temperature is critical for achieving the desired morphology of ECP film. At the optimized TA temperature of 180 °C, electrochromic devices (ECDs) with excellent reversibility were obtained. The response speed of the solid-state device with optimized TA temperature was more than two times faster than the unoptimized one. The coloring efficiency was also significantly enhanced, reaching the value of 374 cm 2 /C. Notably, the ECD based on the optimal TA temperature also showed surprisingly excellent stability, maintaining its bleaching state for almost two weeks with only a slight deterioration in the visible state.
研究领域:
材料科学
·
电化学
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Changlin Xiao,Zhuang Zhuang Ma,Xiaotong Gao,Peijin Zou,Lichao Jia
LaFeO 3 has been widely investigated as formaldehyde sensing material due to its enhanced performance. However, several disadvantages including the response/recovery speed, selectivity, and detection limit mortally restrict its practical applications. Along these lines, herein, platinum (Pt) functionalized LaFeO 3 porous structures were synthesized to optimize the sensing properties. The sensing test revealed that the best response value of Pt functionalized LaFeO 3 was around 2.5 times over that of the pristine material at the operating temperature of 125 o C. Meanwhile, the sensor also possessed the merits of shorter response/recovery time, better selectivity, and lower detection limits. From our analysis, it was demonstrated that the abundant pore structure and the increased adsorbed oxygen level are responsible for the excellent formaldehyde monitoring properties. Our work paves the way for the development of novel Pt functionalized LaFeO 3 porous structures, which can serve as a potential candidate for formaldehyde detection in many practical applications.
研究领域:
材料科学
·
传感器技术
·
环境监测
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2015
·Vol. 5
·期 1
·1-10
·
IF 5.578
Lian Zhipeng,Yan Qingfeng,Lv Qianrui,Wang Ying,Liu Lili,Zhang Lijing,Pan Shilie,Li Qiang,Wang Liduo,Sun Jia-Lin
Recently, the discovery of organometallic halide perovskites provides promising routes for fabricating optoelectronic devices with low cost and high performance. Previous experimental studies of MAPbI 3 optoelectronic devices, such as photodetectors and solar cells, are normally based on polycrystalline films. In this work, a high-performance planar-type photodetector fabricated on the (100) facet of a MAPbI 3 single crystal is proposed. We demonstrate that MAPbI 3 photodetector based on single crystal can perform much better than that on polycrystalline-film counterpart. The low trap density of MAPbI 3 single crystal accounts for the higher carrier mobility and longer carrier diffusion length, resulted in a significant performance increasement of MAPbI 3 photodetector. Compared with similar planar-type photodetectors based on MAPbI 3 polycrystalline film, our MAPbI 3 single crystal photodetector showed excellent performance with good stability and durability, broader response spectrum to near-infrared region, about 10 2 times higher responsivity and EQE and approximately 10 3 times faster response speed. These results may pave the way for exploiting high-performance perovskites photodetectors based on single crystal.
研究领域:
材料科学
·
光电技术
✓ 已验证
DOI
PubMed
高影响因子
Journal of Semiconductors
·
2024
·Vol. 45
·期 3
·032703
·
IF 4.8
Xinfa Zhu,Weishuai Duan,Xiancheng Meng,Xiyu Jia,Yonghui Zhang,Pengyu Zhou,Mengjun Wang,Hongxing Zheng,Chao Fan
The emergent two-dimensional (2D) material, tin diselenide (SnSe2), has garnered significant consideration for its potential in image capturing systems, optical communication, and optoelectronic memory. Nevertheless, SnSe2-based photodetection faces obstacles, including slow response speed and low normalized detectivity. In this work, photodetectors based on SnS/SnSe2 and SnSe/SnSe2 p−n heterostructures have been implemented through a polydimethylsiloxane (PDMS)−assisted transfer method. These photodetectors demonstrate broad-spectrum photoresponse within the 405 to 850 nm wavelength range. The photodetector based on the SnS/SnSe2 heterostructure exhibits a significant responsivity of 4.99 × 103 AW−1, normalized detectivity of 5.80 × 1012 cmHz1/2W−1, and fast response time of 3.13 ms, respectively, owing to the built-in electric field. Meanwhile, the highest values of responsivity, normalized detectivity, and response time for the photodetector based on the SnSe/SnSe2 heterostructure are 5.91 × 103 AW−1, 7.03 × 1012 cmHz1/2W−1, and 4.74 ms, respectively. And their photodetection performances transcend those of photodetectors based on individual SnSe2, SnS, SnSe, and other commonly used 2D materials. Our work has demonstrated an effective strategy to improve the performance of SnSe2-based photodetectors and paves the way for their future commercialization.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yang Hu,Dongpeng Yang,Dekun Ma,Shaoming Huang
Mechanochromic photonic crystals (MPCs) that can change their colors under pressures are highly desired. However, the poor sensitivity of MPCs (including the limited tuning range of photonic bandgap and responsive speed) and stability restrict their practical applications. Here, extremely sensitive MPCs film with outstanding optical performances was fabricated through the self-assembly of the silica particles into di(ethylene glycol) ethyl ether acrylate (DEGEEA) and fixing the ordered structures by photopolymerization. The strong electrostatic repulsion between the particles was experimentally proved to be the key for the self-assembly of silica particles in nonpolar DEGEEA, ruling out the solvation force as the driving force. Compared with the conventional MPCs, the as-fabricated MPCs exhibit significant improvements in optical performances, including broad tuning range of photonic bandgap (362 nm), high sensitivity (7.55 nm/kPa), fast responsive speed (7.0 nm/ms), long-lasting usability (>2 months), wide working temperature range (−20 to100 ℃) and excellent reversibility (>1000 times) in cycling test. Based on these characteristics, the MPCs can be used for display applications with high-resolution (up to 5.0-µm resolution) and full colors. This work provides new insight for the self-assembly of colloids and will extend the applications of MPCs in sensitive sensors, multicolor displays, and smart windows.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
Advanced Intelligent Systems
·
2020
·Vol. 2
·期 8
·2000036
·
IF 0
Guinan Chen,Zhonglin Yang,Wenwen Wang,Lili Bi,Liangjun Chen,Yongwu Peng,Changhui Ye
The ability to fabricate electrothermal actuators (ETAs) simultaneously featuring ultrafast response speed (within 0.1 s), large deformation (bending for at least 360°), high figure-of-merit (FoM, larger than 0.1%), and low driving voltage (smaller than 1 V) in a single device is extremely important and challenging for their applications in artificial muscles, switches, and microsensors for robotics and biomimetic devices. Herein, an ETA composed of a silver nanowire (AgNW) layer and an ultrathin linear low-density polyethylene (LLDPE) film with all the aforementioned features is designed. Due to the high conductivity of the AgNW layer and the great difference between the coefficients of thermal expansion of AgNW layer and LLDPE film as well as the huge change in the heat transfer coefficient between flat and rolled ETA, the obtained ETA exhibits an ultrafast response speed of 0.08 s for a bending angle of 360° with a FoM of 0.46% at a low driving voltage of 1 V, over one order of magnitude larger than those of reported ETAs. As a proof-of-concept application, the as-prepared ETAs can be used as intelligent mechanical devices with excellent performance.
研究领域:
材料科学
·
仿生学
·
机器人技术
✓ 已验证
产品关联
DOI
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 32
·9933-9938
·
IF 6.641
Chunli Jiang,Yu Zhang,Bobo Tian,Chunhua Luo,Ni Zhong,Jianlu Wang,Xiangjian Meng,Hui Peng,Chun-Gang Duan,Junhao Chu
Artificial synaptic devices are the hardware basis of highly efficient neuromorphic networks with low energy consumption. Great challenges still remain in this research field, like improving the response speed, reducing the energy consumption, and exploring new materials and working principles. In this work, we synthesize a new terthiophene monomer functionalized with a conjugated acrylic acid group (MTAA). The electropolymerization of MTAA results in the formation of a three-dimensional network of conducting polymer nanowires (PMTAA). Based on this nanowire network, a two-terminal artificial synaptic device with multilevel conductance states is fabricated. The device is successfully used to emulate important biological synaptic functions, including paired-pulse facilitation (PPF), spike rate-dependent plasticity (SRDP) and spike timing-dependent plasticity (STDP). The carboxyl groups in the polymer provide a possible way to fast neutralize the positively charged polymer backbone during the oxidation process, which results in the fast response of the device to electrical pulses with an ultralow energy consumption of 6.9 fJ per synaptic event.
研究领域:
材料科学
·
神经形态计算
·
生物电子学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 30
·期 5
·1907650
·
IF 15.621
Yong Zhang,Xiaoyue Zhao,Jiaxin Chen,Siyuan Li,Wei Yang,Xiaosheng Fang
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.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Haile Liu,Tursun Abdiryim,Ruxangul Jamal,Xiong Liu,Mariyam Niyaz,Lielie Liu,Hujun Zhang,Dongna Zou,Junxia Li,Yanyan Song,Jin Wei
The ideal material for detecting ultraviolet(UV) is TiO 2 nanorods (TiO 2 NRs). However, the photosensitive response speed and response speed of TiO 2 NRs are affected by its surface defects . We need to choose an appropriate method to solve this problem. In this study, TiO 2 NRs and D-A-D type conducting polymer containing pyridazine as the acceptor unit and 3,4-propylenedioxythiophene as the donor unit 3,6-bis (2- (3,4-propylidene dioxythiophenyl)) pyridazine are electrochemically combined to fabricate UV photodetectors . The structure of the material is analyzed by SEM , mapping, XRD , FT-IR, UV–vis and XPS , indicating the strongly enhanced synergistic effect between PProDOT-Pz and TiO 2 NRs and the homogeneous distribution of polymer on the TiO 2 NRs surface. The results show that under the low power (0.35 mW cm −2 ) UV illumination, the hybrid system has high responsivity (342.19 mA W −1 ) large detectivity (1.36 × 10 11 Jones) fast time pulse response (T rise = 6.2 s, T decay = 7.7 s) and EQE (110.35%) at the bias voltage of 3 V. More importantly, the photodetector works stably with good repeatability, which shows that the device configuration based on TiO 2 NRs and PProDOT-Pz heterojunction is proved to be an excellent candidate device with high sensitivity and fast response for UV signal.
研究领域:
材料科学
·
光电材料
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）