Science Bulletin
·
2015
·Vol. 60
·期 12
·1122-1127
·
IF 0
Liu Shuang,Wu Jia-Ke,Fan Cong-Cheng,Xue Guo-Biao,Chen Hong-Zheng,Xin Huolin L.,Li Han-Ying
A simple solution processing method was developed to grow large-scale well-aligned single crystals including 6,13-bis(triisopropylsilylethynyl)pentacene (TIPS-pentacene), anthracene, tetracene, perylene, C 60 and tetracyanoquinodimethane. As pinned by a solid needle, a droplet of semiconductor solution dried into single-crystal arrays on a 1 cm × 2 cm substrate. TIPS-pentacene was used to demonstrate the fabrication of hundreds of field-effect transistors (FETs) with the hole mobility as high as 6.46 cm 2 V −1 s −1 . As such, this work provides a high-throughput, yet efficient approach for statistical examination on the FET performance of organic single crystals.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
Ultrafast Science
·
2024
·
IF 0
Guang Huang,Junzi Li,Zilin Zhou,Zongtao Huang,Wei Kong,Fangteng Zhang,Youjun Zeng,Guanyu Liu,Tingchao He,Lin Ma
Singlet fission (SF) is a spin-conserving process converting 1 singlet exciton into 2 triplet excitons. This exciton multiplication mechanism offers an attractive route to solar cells that circumvent the single-junction Shockley–Queisser limit. However, it remains unclear how intermolecular coupling, which is subject to the aggregation extent in thin-film morphology, controls SF pathways and dynamics. The prototype molecule 6,13-bis(triisopropylsilylethynyl)-pentacene (TIPS-pentacene) has been extensively studied to investigate SF mechanisms. However, previous literature reports have presented divergent SF mechanisms and pathways in TIPS-pentacene films. In this study, solvent vapor annealing treatment is used to deliberately adjust the aggregation extent in TIPS-pentacene films. This enables us to reproduce various SF pathways reported in the literature under the same experimental conditions, with the only variation being the level of aggregation. These results shed light on the crucial role that molecular aggregation plays in modulating both the SF mechanism and pathway and reconciles the previously contentious SF mechanisms and pathways reported in TIPS-pentacene films. Our study offers substantial insights into the understanding of the SF mechanism and provides a potential avenue for future control of SF pathways in accordance with specific application requirements.
研究领域:
化学
·
材料科学
·
物理学
✓ 已验证
DOI
THIN SOLID FILMS
·
2022
·
IF 2.358
Peng Zhang,Emmanuel Jacques,Laurent Pichon,Olivier Bonnaud
An organic ambipolar charge trapping non-volatile memory device is proposed based on tris(8-hydroxy quinoline) aluminum(Alq 3 )/ fullerene(C 60 )/pentacene double heterojunctions. The double heterojunctions were analyzed and compared with the sole heterojunction. Even though the Alq 3 /pentacene sole heterojunction shows a negative threshold voltage shift for programming under negative biasing, light illumination is required to efficiently erase. In contrast, for C 60 /pentacene sole heterojunction, the negative shift of threshold voltage is observed even with a positive erasing voltage. By combining the two trapping layers, a large memory window with fully-electrical programming and erasing is obtained. The efficient programming and erasing of the double heterojunctions structure are analyzed, sufficient electrons can be injected that enables the electrical erasing, and the negative shift of the threshold voltage under positive erasing voltage for the C 60 /pentacene structure is suppressed due to the suppression of the large built-in potential for the sole heterojunction, which can be verified by a large positive shift for the pentacene/C 60 /pentacene double heterojunctions.
研究领域:
材料科学
·
电子工程
·
有机电子学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Electronic Materials
·
2023
·Vol. 9
·期 11
·2300392
·
IF 6.2
Guangliang Li,Lingxian Kong,Qi Su,Xianhua Tan,Xuning Zhang,Zhiyong Liu,Tielin Shi,Guanglan Liao,Bo Sun
Few-layer black phosphorus (FL-BP) shows great potential in infrared polarization-sensitive photodetection due to its narrow bandgap and strong in-plane anisotropy. However, FL-BP is easy to be oxidized and degraded, which severely restricts its applications. Herein, a simple and scalable in situ interfacial passivation method based on pentacene film is reported to enhance the ambient stability of FL-BP as well as achieve n-type doping for improved polarization-sensitive photoimaging. High crystal quality FL-BP flakes with intrinsic anisotropy are prepared by electrochemical exfoliation. The morphology and Raman spectra of FL-BP/pentacene exhibit excellent stability 28 days after passivation. In addition, the hole mobility is significantly enhanced and dark current is substantially suppressed due to the interfacial passivation and n-type doping effect. The FL-BP/Pentacene based photodetector shows a broadband response from visible to near-infrared with good stability. The photoresponsivity under 915 nm illumination is calculated as 2.2 mA W −1 with an anisotropy ratio of 1.29. Furthermore, the polarization imaging under the irradiation at zigzag and armchair directions directly reveals the strong infrared polarization-sensitive imaging capability of FL-BP/pentacene. This work also opens up new avenues to enhance the photoresponse and stability of various optoelectronics based on similarly unstable 2D materials.
研究领域:
纳米材料学
·
光电子学
·
二维材料
·
半导体物理
·
红外成像
·
表面科学
✓ 已验证
DOI
高影响因子
CARBON
·
2023
·
IF 10.9
Lu Han,Dehui Wang,Mengdie Li,Yang Zhong,Kanghong Liao,Yingbo Shi,Wenjing Jie
As the development of neuromorphic computing , it is meaningful to explore the synaptic memristors based on organic materials owing to their advantages in low cost, good mechanical flexibility and strong biocompatibility. In this work, organic pentacene thin films have been deposited on different substrates by the thermal evaporation method. The prepared thin films on SiO 2 /Si substrates demonstrate the co-existence of digital and analog resistive switching (RS) behaviors as well as a series of synaptic plasticity. To characterize the flexibility of the organic thin films, lateral memristors have been fabricated on polyethylene terephthalate (PET) substrates and demonstrate comparable RS behaviors when the bending radius is decreased to 1.26 cm or after 1000 bending. Furthermore, vertical memristors with Pt/pentacene/indium tin oxide (ITO) structure have been constructed when the organic thin films are deposited on ITO/PET substrates, exhibiting bipolar RS behaviors with low SET voltage of 0.65 V. The vertical synaptic memristors can be used to simulate the “learning-forgetting” experience of human brain. More importantly, an artificial neural network (ANN) can be simulated based on the vertical synaptic memristors, demonstrating 93.8 % recognition accuracy for hand-written digit image. This study suggests potential applications of the organic pentacene thin films for neuromorphic computing.
研究领域:
材料科学
·
微电子学
·
生物电子学
·
纳米科技
·
神经工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 9
·3213-3226
·
IF 6.4
Zihong Shen,Zunxian Yang,Yuanqing Zhou,Yuliang Ye,Bingqing Ye,Qiaocan Huang,Wenbo Wu,Hongyi Hong,Zeqian Hong,Zongyi Meng,Zhiwei Zeng,Songwei Ye,Zhiming Cheng,Qianting Lan,Jiaxiang Wang,Ye Chen,Hui Zhang,Tailiang Guo,Yun Ye,Zhenzhen Weng,Yongyi Chen
Artificial photonic synapses, owing to their high sensitivity, low power consumption, and integration of sensing and memory, have aroused comprehensive discussion and have been developed into devices used as the new sensors for the Internet of Things (IoT) and artificial neural networks (ANNs). Colossal energy consumption may be one of the factors hindering the development of neuromorphic computing. Herein, ternary component organic array films of TIPS-pentacene, polystyrene, and CsPbBr3 perovskite quantum dots (QDs) are effectively developed to fabricate photonic synaptic transistors. The patterned organic thin films prepared by the solution processes can be distinctly controlled in the crystallographic orientation using a pre-patterned-guided crystallizing strategy and the corresponding transistor of TIPS-pentacene with mobility over 1 cm2 V−1 s−1 is successfully achieved. On this basis, the ternary composite film exhibits synaptic behaviours from short-term plasticity (STP) to long-term plasticity (LTP), including paired-pulse facilitation (PPF), spike-time-dependent plasticity (STDP), spike-number-dependent plasticity (SNDP), spike-frequency dependent plasticity (SFDP) and light-potentiation/electric-depression. Benefiting from the improved material compatibility and film-forming properties of small molecule semiconductors and perovskite QDs with polymer polystyrene, our synapses still exhibit prominent synaptic features at a low power consumption of 0.036 fJ. Utilizing time-dependent plasticity, the synaptic device stimulated by a series of light signals realizes wireless optical communication. In addition, the pattern recognition function by ANNs is verified. This work provides a feasible fabricating path to patterned array film-based photonic synapses for the next generation human–computer interaction sensors.
研究领域:
材料科学
·
类脑计算
·
光电技术
·
人工智能
✓ 已验证
产品关联
DOI
高影响因子
Science China-Information Sciences
·
2026
·Vol. 69
·期 4
·142403
·
IF 8.1
Wang Yue,Shan Xuanyu,Wang Qiang,Wang Zewei,Liu Siyu,Liu Wei,Zheng Jiahui,Zhao Xiaoning,Wang Zhongqiang,Lin Ya,Tao Ye,Xu Haiyang,Liu Yichun
Multiple sensing and processing capabilities enable an organism to obtain comprehensive information and make real-time decisions in unstructured environments. Inspired by the biological counterpart, developing neuromorphic hardware with multimodal fusion is supposed to realize high-precision processing for complex information. In this work, we developed a visual-auditory-fused reservoir computing system by combining a CH 3 NH 3 PbI 3 nanowire/pentacene optoelectronic memristor and a sound sensor. Under the stimulation of optical/electrical signals, the CH 3 NH 3 PbI 3 nanowire-based device exhibited volatility under optical or electrical stimulation, providing an essential foundation for visual-auditory-fused reservoir computing. The motion detection function was demonstrated using synchronous visual and auditory sensory information. Compared with single sensory input, the detection accuracy increased from 51.2% to 95.5% by combining the visual and auditory modalities. The results presented in this work provide a promising strategy to develop efficient multimodal neuromorphic hardware for human-robot interactions.
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2026
·
IF 4.9
Chenglong Zhou,Yongsheng Tan,Anbiao Gui,Shunwei Zhu,Shunhang Wei,Zebo Fang,Qiufeng Ye
In this work, a self-powered pentacene/Ga 2 O 3 heterojunction solar-blind ultraviolet (UV) photodetector was fabricated on a flexible mica substrate using magnetron sputtering and thermal evaporation. The device exhibits excellent self-powered characteristics under 254 nm solar-blind UV illumination. Under 254 nm irradiation with an intensity of 200 W/cm 2 at 0 V bias, the device achieved a responsivity of 2.11 mA/W, a specific detectivity of Jones, and a photo-to-dark current ratio of 2800. The rise and fall times were 0.69 s and 1.39 s, respectively. Furthermore, mechanical bending tests were conducted on the flexible device. After 700 bending cycles at a 30 rc , no significant degradation was observed in the current–voltage characteristics or the responsivity at 0 V bias, demonstrating its outstanding mechanical robustness.
✓ 已验证
产品关联
DOI
高影响因子
Optical Materials Express
·
2021
·Vol. 11
·期 4
·1004-1013
·
IF 3.442
Hongliang Zhao,Tengteng Li,Qingyan Li,Chengqi Ma,Jie Li,Chenglong Zheng,Yating Zhang,Yating Zhang,Jianquan Yao,Jianquan Yao
The monolithic stacked design is expected to solve the challenges of wiring difficulties, complex fabrication processes, and low resolution. However, a photodetector array with low operating voltage that is suitable for imaging applications has not been proposed. Here, a perovskite photodetector array with a monolithic stacked structure is proposed. The CH3NH3PbI3 photodetector has a low power consumption off-state (0 V) and on-state (−2 V) voltage, and the highest responsivity and specific detectivity of 0.39 A/W and 4.53×1012 Jones at 775 nm, respectively. The rise time and decay time are 111 µs and 250 µs respectively. In addition, the imaging application shows high contrast, which provides a simple and effective way to prepare high performance perovskite imaging devices.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Wei Huang,Samuel Kin-Man Lai,Kaiqing Liang,Keyuan Pu,Xin Wang,Yuping Chen,Kwan-Ming Ng
Gold nanoparticles (AuNPs) have been widely utilized as an effective substrate for triggering molecular ionization upon photoexcitation. However, its underlying mechanism(s) remains unclear. Here, by blocking heat transfer and electron transfer on photo-excited AuNPs with a thin layer of silica shell (i.e., Au@SiO2 NPs), the critical role of the enhanced E-field in ionizing nearby molecules was evidenced. The enhanced E-field of the Au core could enhance the protonation of amino acids (via short-range interaction) by polarizing the analyte molecules. In contrast, the polarizability of the Au core showed a more pronounced effect to enhance the metal cationization process (Na+ and K+ adduction via long-range interaction) by polarizing both the analyte molecules and metal ions and was successfully applied to the sensitive analysis of amino acids in human serum.
研究领域:
纳米技术
·
物理化学
·
分析化学
✓ 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）