The Experts below are selected from a list of 330 Experts worldwide ranked by ideXlab platform
Liwei Lin - One of the best experts on this subject based on the ideXlab platform.
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piezoresistive stretchable strain sensors with human machine interface demonstrations
Sensors and Actuators A-physical, 2018Co-Authors: Ilbey Karakurt, Junwen Zhong, Liwei Lin, Levent Beker, Yoshihiro Kubota, Shilong Zhao, Min Zhang, Xiaohao WangAbstract:Abstract Stretchable strain sensors are important elements in flexible and skin-mountable electronics typically fabricated using semiconductor materials in cleanroom-based manufacturing processes. This work demonstrates piezoresistive strain sensors with both strain and pressure sensing capabilities by a cost-effective and versatile process utilizing a Laser Patterning, graphite conversion, and polymeric transfer process. The resulting sensing systems exhibit high gauge factor of 37 and pressure sensitivity of 0.088kPa-1 with high sustainable strain up to 70%. These exceptional performances are explained and observed by deforming the sensor under an in-situ SEM to show self-healing characteristics of films under large deformations. The highly sensitive strain sensors have been shown in human interface demonstrations, such as measuring the physiological signal of the human pulses, finger pressure and bending of fingers as well as assisting a robotic arm for gripping and releasing operations.
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Laser induced molybdenum carbide graphene composites for 3d foldable paper electronics
Advanced Materials, 2018Co-Authors: X. Zang, Caiwei Shen, Yao Chu, Minsong Wei, Junwen Zhong, Mohan Sanghadasa, Liwei LinAbstract:Versatile and low-cost manufacturing processes/materials are essential for the development of paper electronics. Here, a direct-write Laser Patterning process is developed to make conductive molybdenum carbide-graphene (MCG) composites directly on paper substrates. The hierarchically porous MCG structures are converted from fibrous paper soaked with the gelatin-mediated inks containing molybdenum ions. The resulting Mo3 C2 and graphene composites are mechanically stable and electrochemically active for various potential applications, such as electrochemical ion detectors and gas sensors, energy harvesters, and supercapacitors. Experimentally, the electrical conductivity of the composite is resilient to mechanical deformation with less than 5% degradation after 750 cycles of 180° repeated folding tests. As such, the direct Laser conversion of MCGs on papers can be applicable for paper-based electronics, including the 3D origami folding structures.
Marika Edoff - One of the best experts on this subject based on the ideXlab platform.
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Next generation interconnective Laser Patterning of CIGS thin film modules
Solar Energy Materials and Solar Cells, 2011Co-Authors: Per-oskar Westin, Uwe Zimmermann, Marta Ruth, Marika EdoffAbstract:Laser Patterning of thin film solar cells has proven technically feasible for all layers but still remains a challengingtopic for research and development. We present a method where P2 Laser pattern ...
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Laser Patterning of p2 interconnect via in thin film cigs pv modules
Solar Energy Materials and Solar Cells, 2008Co-Authors: Per-oskar Westin, Uwe Zimmermann, Marika EdoffAbstract:The use of Laser scribed Cu(In,Ga)Se2 as a high-speed and low-stress alternative to the standard mechanical scribing has been investigated for thin-film PV modules on glass substrates. Laser scribe ...
Aldo Di Carlo - One of the best experts on this subject based on the ideXlab platform.
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closing the cell to module efficiency gap a fully Laser scribed perovskite minimodule with 16 steady state aperture area efficiency
IEEE Journal of Photovoltaics, 2018Co-Authors: Arnaud Walter, Soo-jin Moon, BRETT AKIRA KAMINO, Linus Löfgren, Davide Sacchetto, Fabio Matteocci, Babak Taheri, Julien Bailat, Aldo Di Carlo, Christophe BallifAbstract:Organic–inorganic halide perovskite solar cells show increasing power conversion efficiencies, approaching the values of silicon-based devices. To date, however, most of the reported record efficiencies for perovskite solar devices are obtained on single cells with active areas significantly below 1 cm2. Hence, demonstrating highly efficient devices with an upscaled active area is one of the key challenges faced by this technology. Here, we demonstrate the successful use of thin-film Laser Patterning techniques to produce 14 cm2 modules with steady-state aperture area efficiencies as high as 16% and a geometrical fill factor of 92%.
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Laser Patterning engineering for perovskite solar modules with 95 aperture ratio
IEEE Journal of Photovoltaics, 2017Co-Authors: Alessandro Lorenzo Palma, Antonio Agresti, Sara Pescetelli, Fabio Matteocci, Emanuele Calabro, Luigi Vesce, Silke Christiansen, Michael Schmidt, Aldo Di CarloAbstract:Small area hybrid organometal halide perovskite based solar cells reached performances comparable to the multicrystalline silicon wafer cells. However, industrial applications require the scaling-up of devices to module-size. Here, we report the first fully Laser-processed large area (14.5 cm2) perovskite solar module with an aperture ratio of 95% and a power conversion efficiency of 9.3%. To obtain this result, we carried out thorough analyses and optimization of three Laser processing steps required to realize the serial interconnection of various cells. By analyzing the statistics of the fabricated modules, we show that the error committed over the projected interconnection dimensions is sufficiently low to permit even higher aperture ratios without additional efforts.
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Laser patterned functionalized cvd graphene as highly transparent conductive electrodes for polymer solar cells
Nanoscale, 2017Co-Authors: Luca La Notte, Enrica Villari, G V Bianco, Alberto Sacchetti, Alessandro Lorenzo Palma, Maria M. Giangregorio, Giovanni Bruno, Aldo Di Carlo, Anna RealeAbstract:A five-layer (5L) graphene on a glass substrate has been demonstrated as a transparent conductive electrode to replace indium tin oxide (ITO) in organic photovoltaic devices. The required low sheet resistance, while maintaining high transparency, and the need of a wettable surface are the main issues. To overcome these, two strategies have been applied: (i) the p-doping of the multilayer graphene, thus reaching 25 Ω □−1 or (ii) the O2-plasma oxidation of the last layer of the 5L graphene that results in a contact angle of 58° and a sheet resistance of 134 Ω □−1. A Nd:YVO4 Laser Patterning has been implemented to realize the desired layout of graphene through an easy and scalable way. Inverted Polymer Solar Cells (PSCs) have been fabricated onto the patterned and modified graphene. The use of PEDOT:PSS has facilitated the deposition of the electron transport layer and a non-chlorinated solvent (ortho-xylene) has been used in the processing of the active layer. It has been found that the two distinct functionalization strategies of graphene have beneficial effects on the overall performance of the devices, leading to an efficiency of 4.2%. Notably, this performance has been achieved with an active area of 10 mm2, the largest area reported in the literature for graphene-based inverted PSCs.
M Takai - One of the best experts on this subject based on the ideXlab platform.
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high speed maskless Laser Patterning of indium tin oxide thin films
Applied Physics Letters, 1998Co-Authors: O Yavas, M TakaiAbstract:Patterning characteristics of indium tin oxide thin films using different wavelengths of a diode-pumped Q-switched Nd:YLF and a flashlamp-pumped Nd:YAG Laser have been studied. While a ripplelike structure in the etched line was formed due to incomplete material removal when the first harmonic of the Nd:YLF or Nd:YAG Laser was used, a residue-free line could be obtained using the fourth harmonic of the Nd:YLF Laser even at higher scan speeds. The observed differences in the morphology could be attributed to different absorption characteristics at the infrared and ultraviolet wavelengths. High process speeds in excess of 1 m/s could be achieved.
Peter Kubis - One of the best experts on this subject based on the ideXlab platform.
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organic and perovskite solar modules innovated by adhesive top electrode and depth resolved Laser Patterning
Energy and Environmental Science, 2016Co-Authors: George D Spyropoulos, Peter Kubis, Cesar Omar Ramirez Quiroz, Michael Salvador, Nicola Gasparini, Peter Schweizer, Jens Adams, Ning Li, Erdmann Spiecker, Tayebeh AmeriAbstract:We demonstrate an innovative solution-processing fabrication route for organic and perovskite solar modules via depth-selective Laser Patterning of an adhesive top electrode. This yields unprecedented power conversion efficiencies of up to 5.3% and 9.8%, respectively. We employ a PEDOT:PSS–Ag nanowire composite electrode and depth-resolved post-Patterning through beforehand laminated devices using ultra-fast Laser scribing. This process affords low-loss interconnects of consecutive solar cells while overcoming typical alignment constraints. Our strategy informs a highly simplified and universal approach for solar module fabrication that could be extended to other thin-film photovoltaic technologies.
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Patterning of organic photovoltaic modules by ultrafast Laser
Progress in Photovoltaics, 2015Co-Authors: Peter Kubis, Florian Machui, Gebhard J Matt, Tobias Stubhan, Monika M Voigt, Christoph J BrabecAbstract:In this paper, we demonstrate that Laser Patterning of organic solar cells by ultrafast Laser systems (pulse length <350 fs) is an attractive process to produce photovoltaic modules with outstanding high geometric fill factors. Moreover, in terms of precision, registration, and debris generation and in terms of keeping the damage to the underneath layers at a minimum, ultrafast Laser Patterning with a pulse length of few hundreds of femtoseconds turns out to yield superior results. Ablation of all three different solar cell layers (electrodes (P1 and P3) and interfaces and semiconductor (P2)) is achieved with a single wavelength simply by a precise adjustment of the Laser fluence and the Patterning overlap. Camera positioning allows a precise registration between the various processing steps and a reduction of the width of the overall interconnection regime to the hundreds of micrometers dimension, resulting in high geometrical fill factors of over 90% for monolithically interconnected organic solar cell modules. Copyright © 2013 John Wiley & Sons, Ltd.
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high precision processing of flexible p3ht pcbm modules with geometric fill factor over 95
Organic Electronics, 2014Co-Authors: Peter Kubis, Luca Lucera, Florian Machui, George D Spyropoulos, Johann Cordero, Alfred Frey, Joachim Kaschta, Monika Voigt, Gebhard J Matt, Eitan ZeiraAbstract:Flexible OPV modules, based on P3HT:PCBM as absorber layer, were manufactured with a power conversion efficiency over 3% and for a total area of 3500 mm2 consisting of 14 in series interconnected cells. The modules utilize the excellent mechanical and the outstanding optical properties of sputtered transparent ITO-Metal-ITO (IMI) electrodes deposited on the PET foil on the one hand, and the combination of large area slot-die coating with high resolution ultrafast Laser Patterning on the other hand. The manufacturing of modules with outstanding performance was found to be reproducible. The right combination of innovative electrodes and smart roll-to-roll compatible processing technologies demonstrates a viable path towards high efficient industrial module technology.
