Article
Chemistry, Multidisciplinary
Yi-Fan Shen, Hao Zhang, Jianqi Zhang, Chenyang Tian, Yanan Shi, Dingding Qiu, Ziqi Zhang, Kun Lu, Zhixiang Wei
Summary: Slot-die coating is the most compatible method for roll-to-roll processing of large-area flexible organic solar cells (OSCs), but its performance lags behind spin-coating. This study investigates the film-formation kinetics of two acceptors, Qx-1 and Qx-2, in slot-die coating. The excessive crystallinity of Qx-2 leads to oversized crystal domains, while Qx-1 shows excellent performance with a power conversion efficiency (PCE) of 13.70%.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Jianhao Wang, Xunda Liu, Fupeng Huo, Kento Kariya, Noriyuki Masago, Hiroshi Nishikawa
Summary: A novel TLP bonding method using In-coated Cu sheet was designed for high-temperature die attach, showing significant improvement in the mechanical properties of joints bonded under different parameters, although the brittle characteristics and location of the fracture remained almost unchanged for the different bonding parameters.
MATERIALS RESEARCH BULLETIN
(2022)
Article
Chemistry, Multidisciplinary
Jingwei Xue, Heng Zhao, Baojun Lin, Yilin Wang, Qinglian Zhu, Guanyu Lu, Baohua Wu, Zhaozhao Bi, Xiaobo Zhou, Chao Zhao, Guanghao Lu, Ke Zhou, Wei Ma
Summary: Organic solar cells (OSCs) have shown great potential, but traditional methods and toxic solvents limit their commercialization and efficiency. A dual-slot-die sequential processing (DSDS) strategy is proposed to overcome these limitations. The unique film-formation mechanism contributes to the improved performance.
ADVANCED MATERIALS
(2022)
Article
Engineering, Environmental
Zhujun Chen, Mingkun Jiang, Lingfei Qi, Wu Wei, Ziyi Yu, Wendong Wei, Xinhai Yu, Jinyue Yan
Summary: Cities worldwide are reshaping their infrastructure to achieve a carbon-neutral and sustainable future. This study evaluates the potential of utilizing railway stations and land along rail lines for photovoltaic electricity generation, using the Beijing-Shanghai high-speed railway as a case study. The results show that this method can provide renewable energy to high-speed trains and meet a significant portion of their electricity demand.
RESOURCES CONSERVATION AND RECYCLING
(2022)
Article
Nanoscience & Nanotechnology
Jiayu Bi, Jiarun Chang, Miao Lei, Wei Zhang, Fanning Meng, Guiqiang Wang
Summary: A high-quality CsPbBr3 perovskite film was successfully fabricated using a thiourea-assisted two-step spin-coating process, resulting in superior performance and environmental stability in the perovskite solar cell.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Electrical & Electronic
Luyu Wang, Zhiyang Xie, Beibei Pan, Zhiqi Zhou, Linze Li, Xinbo Zou, Haiming Ji, Baile Chen
Summary: We present a novel 850 nm high-speed photodetector that can simultaneously achieve high-speed data acquisition and electrical power generation. It is based on a GaAs/AlGaAs modified uni-traveling carrier photodetector (MUTC-PD). Compared to traditional p-i-n photodetectors with the same absorber thickness, the MUTC device exhibits a high 3 dB bandwidth of 11.9 GHz and a power conversion efficiency of 38.5% under a forward bias of +0.7 V. This exceptional performance is achieved by incorporating the MUTC structure on LPC devices. The device is expected to find applications in simultaneous lightwave information and power transfer, offering a potential solution for next-generation combined power and data transceiver modules.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Polymer Science
Fenghua Li, Man Liu, Dexiang Yan, Zonggong Yin, Jiahong Xiao, Bin Sun, Yuhong Shen, Tingting Gao, Qinze Liu, Guowei Zhou
Summary: In this study, an eco-friendly and universal dyeing technology was developed using a polymer of catechol and polyethyleneimine as a dye. The dyed fabrics showed excellent fastness characteristics and antibacterial properties, making this technology highly promising for various applications.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Francesco Bisconti, Antonella Giuri, Gianluigi Marra, Alberto Savoini, Paolo Fumo, Rosamaria Marrazzo, Stefano Zanardi, Gianni Corso, Riccardo Po, Paolo Biagini, Eleonora Quadrivi, Riikka Suhonen, Thomas M. Kraft, Mari Ylikunnari, Andrea Listorti, Carola Esposito Corcione, Silvia Colella, Aurora Rizzo
Summary: The study proposes the use of a polymeric material to deposit perovskite layers with easy processability, utilizing a starch-polymer/perovskite composite to enable the deposition of hybrid halide perovskite material in an uncontrolled humid environment without toxic solvents. This innovative approach enables the fabrication of flexible solar cells with power conversion efficiency higher than 3%.
Article
Pharmacology & Pharmacy
Nejc Koracin, Matevz Zupancic, Franc Vrecer, Grega Hudovornik, Iztok Golobic
Summary: Liquid atomization plays a crucial role in pharmaceutical manufacturing, particularly in the production steps involving fluid bed granulation, tablet film coating, and pellet coating. This study focuses on characterizing the atomization process using high-speed imaging, optical microscopy, and continuous back-light illumination combined with robust image processing algorithms. The results provide insights into droplet size distribution and speed, as well as the correlation between droplet size and other process parameters. The proposed method demonstrates potential for real-time coating monitoring and rapid optimization of the atomization process.
INTERNATIONAL JOURNAL OF PHARMACEUTICS
(2022)
Article
Neurosciences
Simon Arvin, Rune Nguyen Rasmussen, Keisuke Yonehara
Summary: EyeLoop is an open-source eye tracker that provides high accuracy online analysis with a highly efficient vectorized pupil detection method, running at over 1,000 frames per second on consumer-grade hardware. It is suitable for a wide range of species, including rodents, humans, and non-human primates.
FRONTIERS IN CELLULAR NEUROSCIENCE
(2021)
Article
Chemistry, Physical
Yuan Gao, Hong Hu, Jian Chang, Qiyao Huang, Qiuna Zhuang, Peng Li, Zijian Zheng
Summary: Flexible and stable Li-metal composite yarn (LMCY) is designed for high-energy-density and long-lasting wire-type Li-metal batteries, showing outstanding performance. Pairing with lithium-iron phosphate (LFP) can deliver high energy density and long lifetime in a foldable full cell configuration.
ADVANCED ENERGY MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Chia-Feng Li, Hung-Che Huang, Shih-Han Huang, Yu-Hung Hsiao, Priyanka Chaudhary, Chun-Yu Chang, Feng-Yu Tsai, Wei-Fang Su, Yu-Ching Huang
Summary: Energy shortage is a global issue as fossil fuels deplete and energy consumption increases. Perovskite solar cells (PSCs) are a promising technology with comparable efficiency to traditional solar cells but lower fabrication costs. However, most PSCs research uses hazardous solvents unsuitable for large-scale production. This study successfully deposited PSC layers using a non-toxic solvent and ambient conditions, achieving high power conversion efficiencies.
Article
Energy & Fuels
Yun-Ming Sung, Cheng-Si Tsao, Hou-Chin Cha, Wei-Yang Ma
Summary: In this study, we successfully scaled up the semitransparent MoO3/Ag/MoO3 top electrode to the large-area semitransparent PSC module, greatly improving photovoltaic and optical performance.
PROGRESS IN PHOTOVOLTAICS
(2023)
Article
Chemistry, Multidisciplinary
Heng Zhao, Baojun Lin, Jingwei Xue, Hafiz Bilal Naveed, Chao Zhao, Xiaobo Zhou, Ke Zhou, Hongbo Wu, Yuhang Cai, Daqin Yun, Zheng Tang, Wei Ma
Summary: This study demonstrates a novel approach to achieve high-efficiency fabrication of large-area, thick organic solar cells using slot-die coating and a ternary strategy. By incorporating a highly crystalline molecule, BTR-Cl, the phase separation kinetics of the film is regulated, resulting in improved molecular crystallinity and vertical phase separation, leading to high power conversion efficiencies.
ADVANCED MATERIALS
(2022)
Review
Chemistry, Physical
Shang Li, Xuanpu Dong, Shuren Guo, Xinwang Liu, Huatang Cao
Summary: This paper reviews the research status of high-energy beam processing techniques on the surface properties of HSS and discusses the advantages and disadvantages of different strengthening methods. High-energy beam surface alloying appears to be the most cost-effective method and has promising development prospects.
Article
Engineering, Electrical & Electronic
Sai Ma, Qinping Yao, Takashi Masuda, Shogo Higaki, Koji Yoshioka, Shozo Arai, Seiichi Takamatsu, Toshihiro Itoh
Summary: The study focuses on developing an artificial intelligence characterization module for measuring deep body temperature of cattle, finding that estimating temperature at the horn of cattle is the most effective, especially in the sitting state. Additionally, a noncontact system for measuring cattle's moving distance was proposed, and its usability and reliability were successfully verified, with an accurate estimation of rumen temperature.
IEEE SENSORS JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
Yoshiyuki Kaiho, Seiichi Takamatsu, Toshihiro Itoh
Summary: This study demonstrates a novel system using neural networks and data from multiple sensors to estimate eardrum temperature. By inputting time series data and optimizing the system, the estimation accuracy was improved, confirming the effectiveness of the system.
IEEE SENSORS JOURNAL
(2021)
Article
Instruments & Instrumentation
Seiichi Takamatsu, Takahiro Yamashita, Toshihiro Itoh
Summary: The study developed a flexible large-area LED lighting fabric that can be applied to different three-dimensional complex shapes such as furniture, tents, and ceilings. The fabrication process utilized automatic weaving technology to create a lightweight fabric that can easily bend.
SENSORS AND MATERIALS
(2021)
Article
Multidisciplinary Sciences
Seiichi Takamatsu, Suguru Sato, Toshihiro Itoh
Summary: This study presents a thin stress-concentration-relocating interposer that can sustain up to 36% textile stretch in electronic textile devices. By transferring the stress concentration area from the fabric circuit to the interposer, the stress concentration in the wiring is reduced. This research is of great significance for the development of reliable packaging for electronic textiles.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Analytical
Seiichi Takamatsu, Suguru Sato, Toshihiro Itoh
Summary: This study proposes a solution of integrating urethane-foam-embedded silicon pressure sensors into car seats to monitor the driver's cognitive state, posture, and driving behavior. The proposed package structure improves the sensitivity and linearity of the sensors, and enables the detection of body movements.
Article
Instruments & Instrumentation
Shun Muramatsu, Seiichi Takamatsu, Toshihiro Itoh
Summary: A novel algorithm that can separate aortic and pulmonary components from the second heart sound without assuming statistical independence is successfully demonstrated. The algorithm optimizes demixing vectors using root-mean-square error as the cost function. The results show that the proposed algorithm can estimate the splitting interval stably and with smaller error range compared to conventional methods.
SENSORS AND MATERIALS
(2022)
Article
Chemistry, Analytical
Michitaka Yamamoto, Shinji Okuda, Seiichi Takamatsu, Toshihiro Itoh
Summary: A new method for fabricating metal interconnects with a vertical wavy structure is proposed, combining the pre-stretch method and the micro-corrugation process. The resulting interconnects show improved stretchability and low electrical resistance, with stable resistance and high durability.
Article
Chemistry, Analytical
Yusuke Yashiro, Michitaka Yamamoto, Yoshihiro Muneta, Hiroshi Sawada, Reina Nishiura, Shozo Arai, Seiichi Takamatsu, Toshihiro Itoh
Summary: This study explored the key parameters of the conventional bamboo charcoal electrode to improve the power generation of microbial fuel cells (MFCs) using rumen bacteria. The surface area of the electrode was found to be the only factor affecting power generation levels, as rumen bacteria concentrated on the electrode's surface. Copper (Cu) plate and Cu paper electrodes were also tested, but their power potential decreased significantly over time due to corrosion.
Article
Chemistry, Analytical
Shun Muramatsu, Yuki Kohata, Emi Hira, Yasuyuki Momoi, Michitaka Yamamoto, Seiichi Takamatsu, Toshihiro Itoh
Summary: Quantitative monitoring of scratching intensity in dogs has become necessary, leading to the development of a body-conduction microphone collar. However, the design of one of its components, the air chamber, has not been appropriately done. This study compared the amplification ratios of air chambers with different shapes through numerical analysis and experiments, finding that the horn-shaped air chamber achieved the highest amplification performance.
Article
Computer Science, Information Systems
Naoto Tomita, Seiichi Takamatsu, Toshihiro Itoh
Summary: We propose an e-textile bioelectrode array for wearable whole-body medical and healthcare monitoring. The challenges in integrating bioelectrodes onto knit textile include forming an insulation layer on silver paste wiring and fixing an ionic liquid gel on the wiring. Our proposed structure includes a laser-patterned hot-melt urethane film attached to silver paste wiring and fabric, and a conductive polymer-coated knit textile pad with fixed ionic liquid gel. The array has high impedance, improved adhesive force, and enables measurement of back pain for medical diagnosis and healthcare applications.
Proceedings Paper
Engineering, Electrical & Electronic
Yusuke Yashiro, Michitaka Yamamoto, Seiichi Takamatsu, Toshihiro Itoh
Summary: A density-variable device has been proposed for a rumen sensor for cattle that can be excreted after use. The device is composed of absorbent polymer and PDMS, which increases its volume by absorbing rumen fluid and ultimately reduces its overall density for excretion. The study identifies the theoretical added volume, appropriate fluid absorption method, and possible design ranges for PDMS membrane thickness and amount of absorbent polymer. The results demonstrate that the proposed structure and design method are suitable for excretable rumen sensors.
Proceedings Paper
Engineering, Electrical & Electronic
Shun Muramatsu, Emi Hira, Yasuyuki Momoi, Michitaka Yamamoto, Seiichi Takamatsu, Toshihiro Itoh
Summary: A novel wearable scratching-sound sensing device has been developed to monitor the scratching behavior and intensity in dogs. The device utilizes body-conduction microphones to detect the scratching sound and estimate the intensity. The results show high accuracy and reliability in determining the scratching behavior and intensity.
Article
Computer Science, Information Systems
Shun Muramatsu, Michitaka Yamamoto, Seiichi Takamatsu, Toshihiro Itoh
Summary: A non-contact method using independent component analysis (ICA) for heart sound measurement was developed and evaluated quantitatively using signal-to-noise ratio (SNR). This method allows non-invasive and non-constrained measurement of heart sounds using microphones. Increasing the number of microphones improves SNR and enables measurement even in the presence of artificial noise. Valuable information about the heart, such as the first (S1) and second (S2) heart sounds, can be obtained.
Proceedings Paper
Engineering, Electrical & Electronic
Takuma Takagi, Junya Nakagawa, Seiichi Takamatsu, Toshihiro Itoh
Summary: The study aims to develop smart suits that provide tactile feedback to the whole body by pressing vibration motors against the body at constant pressure, using a structure with hyperelastic foam and stable pressure from 1.5 kPa to 2.0 kPa. A wiring structure combining conductive fibers and flexible printed board was proposed to prevent movement inhibition and breakage.
2022 INTERNATIONAL CONFERENCE ON ELECTRONICS PACKAGING (ICEP 2022)
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Ayana Mizutani, Seiichi Takamatsu, Toshihiro Itoh, Zymelka Maria, Takeshi Kobayashi
Summary: An ultrathin Si MEMS piezoresistive strain sensor was used to fabricate a glove-shaped wearable device for measuring finger bending motion. A new mounting structure was proposed to reduce strain concentration at the connection between the sensor and the wiring.
2022 INTERNATIONAL CONFERENCE ON ELECTRONICS PACKAGING (ICEP 2022)
(2022)
