Journal of Materials Chemistry C
·
2025
·
IF 5.1
Tao Jin,Wenju Li,Yongyi Zhang,Ruiheng Wang,Shuai Wang,Chen Pan,Guan Wang,Jiacheng Zhang,Lei Yao,Jing Zhang,Qichun Zhang
Artificial synapses have gained considerable attention in modeling artificial visual systems. Facile and efficient p-n heterojunction, acting as the essential component, plays a critical role in configuration optimization and processing capabilities. Herein, we introduced a novel charge-transfer cocrystal that consisted of 5,8-dihydroindolo[2,3-c]carbazole (DDCB) and 7,7,8,8-tetracyanoquinodimethane (TCNQ) via solution-process, which demonstrated good crystallinity and typical n-type charge transport characteristics. To realize good charge storage ability, crystalline p-n heterojunctions with a phase-separated heterostructure were one-step prepared by drop-casting TIPS-pentacene and DDCB/TCNQ solutions onto the substrate. The as-prepared artificial synaptic devices exhibited remarkable paired-pulse facilitation (PPF), spike-duration dependent plasticity, spike-intensity dependent plasticity, and learning-experience behaviors similar to those of biological synapses in response to light pulses. Furthermore, based on the light potentiation and electrical depression modulation properties of these synaptic devices, we constructed artificial neural networks for image recognition, achieving a validation accuracy of over 97% on the modified national institute of standards and technology (MNIST) dataset. This work provides a new simple approach in establishing p-n heterojunction based artificial synapses for applications in light information processing, artificial vision, and memory simulation.
研究领域:
材料科学
·
神经形态工程
·
电子器件
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2017
·Vol. 46
·期 7
·4497-4502
·
IF 1.579
Huang Hang,Hu Hailong,Zhu Jingguang,Guo Tailiang
Inkjet-printed In-Ga-Zn oxide (IGZO) thin-film transistors (TFTs) have been fabricated at low temperature using laser spike annealing (LSA) treatment. Coffee-ring effects during the printing process were eliminated to form uniform IGZO films by simply increasing the concentration of solute in the ink. The impact of LSA on the TFT performance was studied. The field-effect mobility, threshold voltage, and on/off current ratio were greatly influenced by the LSA treatment. With laser scanning at 1 mm/s for 40 times, the 30-nm-thick IGZO TFT baked at 200°C showed mobility of 1.5 cm 2 /V s, threshold voltage of −8.5 V, and on/off current ratio >10 6 . Our findings demonstrate the feasibility of rapid LSA treatment of low-temperature inkjet-printed oxide semiconductor transistors, being comparable to those obtained by conventional high-temperature annealing.
研究领域:
材料科学
·
电子器件
·
纳米技术
·
应用物理学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL PHYSICS
·
2012
·Vol. 25
·期 4
·389-397
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IF 0.692
Li Chun-liang,Ye Xiao-dong,Ding Yan-wei,Liu Shi-lin
The coil-to-globule transition of thermally sensitive linear poly( N -isopropylacrylamide) (PNIPAM) labeled with dansyl group is induced by 1.54 μm laser pulses (width≈10 ns). The dansyl group is used to follow the transition kinetics because its fluorescence intensity is very sensitive to its micro-environment. As the molar ratio of NIPAM monomer to dansyl group increases from 110 to 300, the effect of covalently attached dansyl fluorophores on the transition decreases. In agreement with our previous study in which we used 8-anilino-1-naphthalensulfonic acid ammonium salt free in water as a fluorescent probe, the current study reveals that the transition has two distinct stages with two characteristic times, namely, τ fast ≈0.1 ms, which can be attributed to the nucleation and formation of some “pearls" (locally contracting segments) on the chain, and τ slow ≈0.5 ms, which is related to the merging and coarsening of the “pearls". τ fast is independent of the PNIPAM chain length over a wide range ( M w =2.8×10 6 –4.2×10 7 g/mol). On the other hand, τ slow only slightly increases with the chain length.
研究领域:
高分子化学
·
物理化学
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2024
·Vol. 12
·期 13
·2302662
·
IF 8
Quanhua Lin,Xianqiu Lin,Xu Feng,Wangming Yang,Jiajia Tan,Wenjie Qiu,Shunchun Yao,Zhifeng Chen,Jianrong Qiu,Shifeng Zhou
The rational control of intrinsic defects in materials can significantly enhance their scientific and technological potentials, but it remains a long-standing challenge in nanocrystal-in-glass composites (NGCs). Herein, a defect engineering strategy mediated by the mixed alkali effect is proposed and experimentally demonstrated for NGCs. Interestingly, the hybridization of large alkali ions can effectively increase the barrier of Li + migration and reduce the Li-related defects in LiNbO 3 NGC. As a result, a novel LiNbO 3 NGC with greatly reduced Li-related defects, high crystallinity of over 60%, and excellent optical transmission are successfully fabricated. This unique NGC configuration facilitates efficient transverse second harmonic generation (TSHG) in a broad wavelength region. Based on the above effects, a standard TSHG device is fabricated and implemented to monitor ultrashort optical pulses with duration in the order of ≈10 −13 s over a broad wavelength region, down to 780 nm. The proposed strategy not only provides a new idea for defect engineering in materials science but also has great significance for boosting the practical applications of NGCs in ultrashort optical pulse monitoring.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·Vol. 37
·期 21
·2501131
·
IF 26.8
Jianfeng Yan,Jiajia Tan,Quanhua Lin,Zhihao Zhang,Ziang Liu,Qiang Fu,Lei Yuan,Qi Zhang,Xu Feng,Shifeng Zhou
LiNbO 3 nanocrystal-glass composites (LiNbO 3 -NGC), characterized by its unique 3D random domain structure, have shown great promise for significant applications, such as femtosecond pulse monitoring and full-color 3D displays. However, the nonlinear response of the LiNbO 3 -NGC is greatly suppressed by the defects, and effective manipulation of these defects remains a long-standing challenge. In this study, a Na-hybridization strategy is proposed to control defects in the LiNbO 3 -NGC to enhance its nonlinear properties and realizing its practical application for ultrashort optical pulse monitoring. The findings reveal that the incorporation of Na ions effectively reduces the defects within the composite, resulting in significantly improved nonlinear effects. By using this hybridized LiNbO 3 -NGC, the transverse second-harmonic generation is achieved. An ultrashort optical pulse system is also constructed and successfully applied it for real-time quantitative measurement of the duration, distribution, and front tilting of optical pulses in the 10 −15 s scale. These results not only present an excellent example about defect engineering in nonlinear LiNbO 3 -NGC but also point to practical applications for the measurement of extreme physical parameters.
研究领域:
材料科学
·
光学工程
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Energy
·
2023
·
IF 17.6
Yixin Cao,Li Yin,Chun Zhao,Tianshi Zhao,Tianyou Li,Shuming Kong,Liming Shi,Jiabao Zhou,Zhiyuan Zhang,Ke Yang,Zhihao Xue,Hangyu Wang,Rui Wu,Changzeng Ding,Yunfei Han,Qun Luo,Maxwell Qihan Gu,Xin Wang,Wangying Xu,Jiangmin Gu,Yingli Shi,Li Yang,Xiao Gong,Zhen Wen
Brain-like neuromorphic computing system offers the ability to be used in neural networks on demand and are rapidly gaining interest by researchers due to their outstanding photoelectric stimulation response-ability and multi-segment storage function. In this work, we show the processing capabilities of the neuromorphic computing units for optoelectronic signals and high label noise ratio signals . Demonstrated the functions of potassium ion doped perovskite-based unit resembles properties found in neuronal synapses. Potassium ion passivates perovskite and promotes the formation of the electric double layer and ion doping in the unit so that the unit can simulate the characteristics of biological synapses generated by various electrical simulations according to the demand. Perovskite significantly enhances the unit's responsiveness to light pulses in the visible light range. By implementing the 'resolving training biases via influence-base data relabeling' strategy, the unit demonstrates remarkable performance in high noise recognition tasks. These results open a new direction for the construction of brain-like computers that deal with a complex and high proportion of harmful samples.
研究领域:
材料科学
·
神经工程
·
光电子学
·
生物医学工程
·
计算神经科学
·
纳米技术
·
人工智能硬件
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF PHYSICS
·
2021
·Vol. 23
·期 3
·033019
·
IF 3.732
Bingsuo Zou,Lipeng Hou,Ye Tian,Junbo Han,Hui Peng,Xiongtao Yang,Lijie Shi
The magnetic excitons in diluted magnetic semiconductor (DMS) have varied formats due to the inhomogeneous phases out of doping concentration and/or structural relaxations or defects. Here the high quality cobalt-doped zinc blende ZnSe nanoribbons (NRs) were synthesized, showing bright and color-variable emissions from blue, yellow to a little mixed white colors. Their power and temperature dependent micro-photoluminescence (PL) spectra have been obtained in which two emission bands, one magnetic exciton band near the band-edge and a Co2+ high-level d–d transition emission band at 550 nm out of their ferromagnetic (FM) coupled aggregates in ZnSe lattice, both bands could also be reflected by a nonlinear optical absorption enhancement. The easy formed stacking fault defects in a chemical vapor deposition (CVD) grown ZnSe zincblende NR took part in the above optical processes out of magnetic polaronic excitons (PXs). The femtosecond (fs) laser pulse pumping on single ZnSe:Co NR produces obvious lasing behavior but with profile of a complicated magnetic exciton interactions with indication of a crossover from collective exciton magnetic polarons (EMP) to bound magnetic polaron (BMP) scattering in Co doped ZnSe NR. These findings indicate the complication of the magnetic coupling natures in varied DMS structures, whose optical properties have been found to be highly nonlinear, due to the involvement of the spin–spin, spin–exciton and spin–phonon interactions, verified by the theoretic calculation in Yang X-T et al (2019 Interstitial Zn-modulated ferromagnetism in Co-doped ZnSe Mater. Res. Express 6 106121).
研究领域:
材料科学
·
光学
·
半导体物理
·
纳米技术
·
磁学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）