scholarly journals On-chip Direct Laser Writing of PAN-based Carbon Supercapacitor Electrodes

2021 ◽  
Author(s):  
Andreas Hoffmann ◽  
Pablo Jiménez-Calvo ◽  
Volker Strauss ◽  
Alexander Kühne
Keyword(s):  
Laser Power ◽  
Printed Circuit Board ◽  
Circuit Board ◽  
Carbon Electrodes ◽  
Direct Laser Writing ◽  
Laser Writing ◽  
Printed Circuit ◽  
Direct Laser ◽  
On Chip

We report carbonization of polyacrylonitrile by direct laser writing to produce microsupercapacitors directly on-chip. We demonstrate the process by producing interdigitated carbon finger electrodes directly on a printed circuit board, which we then employ to characterize our supercapacitor electrodes. By varying the laser power, we are able to tune the process from carbonization to material ablation. This allows to not only convert pristine polyacrylonitrile films into carbon electrodes, but also to pattern and cut away non-carbonized material to produce completely freestanding carbon electrodes. While the carbon electrodes adhere well to the printed circuit board, non-carbonized polyacrylonitrile is peeled off the substrate. We achieve specific capacities as high as 260 µF/cm2 in a supercapacitor with 16 fingers.

Direct Laser Writing of Graphene‐Based Electrical Interconnects for Printed Circuit Board Repair

2021 ◽  
pp. 2100514
Author(s):  
Chin Huat Joel Lim ◽  
C. S. Suchand Sandeep ◽  
Vadakke Matham Murukeshan ◽  
Young‐Jin Kim
Keyword(s):  
Printed Circuit Board ◽  
Circuit Board ◽  
Direct Laser Writing ◽  
Laser Writing ◽  
Printed Circuit ◽  
Electrical Interconnects ◽  
Direct Laser

scholarly journals Design and Implementation of SOC-Based Noncontact-Type Level Sensing for Conductive and Nonconductive Liquids

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
J. L. Mazher Iqbal ◽  
Munagapati Siva Kishore ◽  
Arulkumaran Ganeshan ◽  
G. Narayan
Keyword(s):  
Printed Circuit Board ◽  
System On Chip ◽  
Circuit Board ◽  
Sensor Technology ◽  
Electromechanical Systems ◽  
Printed Circuit ◽  
Design And Implementation ◽  
Hardware System ◽  
On Chip

In contrast to the existing electromechanical systems, the noncontact-type capacitive measurement allows for a chemically and mechanically isolated, continuous, and inherently wear-free measurement. Integration of the sensor directly into the container’s wall offers considerable savings potential because of miniaturization and installation efforts. This paper presents the implementation of noncontact (NC)-type level sensing techniques utilizing the Programmable System on Chip (PSoC). The hardware system developed based on the PSoC microcontroller is interfaced with capacitive-based printed circuit board (PCB) strip. The designer has the choice of placing the sensors directly on the container or close to it. This sensor technology can measure both the conductive and nonconductive liquids with equal accuracy.

On-chip replication of high-sag micro-optical components fabricated by direct laser writing

2005 ◽  
Author(s):  
Daniel Asselin ◽  
Patrice Topart ◽  
Lieyi Sheng ◽  
Felix Cayer ◽  
Sebastien Leclair ◽  
...  
Keyword(s):  
Direct Laser Writing ◽  
Laser Writing ◽  
Optical Components ◽  
Direct Laser ◽  
On Chip

An Optimized On-Chip Boost-Type DC-DC Converter With an On-Board Inductance

2014 ◽  
Author(s):  
Paul C.-P. Chao ◽  
Ching-Hua Kuan ◽  
Jia-Wei Su
Keyword(s):  
Printed Circuit Board ◽  
High Efficiency ◽  
Rapid Development ◽  
Current Drive ◽  
Circuit Board ◽  
Electronic Products ◽  
Fully Integrated ◽  
Printed Circuit ◽  
Limited Output ◽  
On Chip

The rapid development of portable electronic products in recent years increases demands of varied displays. With resolutions of panel sizes and pixels under current drive capability improved, this study is intended for designing an inductive DC boost converter circuit for displays, which is fully integrated with IC fabrication technology [1][2]. Most of current displays employ capacitances for voltage-boosting to supply relative high-voltage biases to displays. These booster circuits are in small sizes and with high efficiency, but limited output currents, which are inadequate for some of large-sized displays. To remedy the problem, an on-board, small-sized inductor in the forms of coils in a printed circuit board (PCB) is proposed for a superior solution. This PCB-type inductor can be incorporated into the same board with other drive chips for the displays, while offering large, adequate current, as an incapable task via an on-chip coil.

scholarly journals Load-dependent power transfer efficiency for on-chip coils

2021 ◽  
Author(s):  
Joakim Nilsson ◽  
Johan Borg ◽  
Jonny Johansson
Keyword(s):  
Printed Circuit Board ◽  
Circuit Board ◽  
Transfer Efficiency ◽  
Cmos Process ◽  
Power Transfer ◽  
Single Chip ◽  
Process Technology ◽  
Printed Circuit ◽  
Power Transfer Efficiency ◽  
On Chip

AbstractThis paper presents a theory for the power transfer efficiency of printed circuit board coils to integrated circuit coils, with focus on load-dependence for low-power single-chip systems. The theory is verified with electromagnetic simulations modelled on a 350 nm CMOS process which in turn are verified by measurements on manufactured integrated circuits. The power transfer efficiency is evaluated by on-chip rectification of a 151 MHz signal transmitted by a spiral coil on a printed circuit board at 10 mm of separation to an on-chip coil. Such an approach avoids the influence of off-chip parasitic elements such as bond wires, which would reduce the accuracy of the evaluation. It is found that there is a lower limit for the load below which reducing the power consumption of on-chip circuits yield no increase in voltage generated at the load. For the examined process technology, this limit appears to lie around 56 k$$\Omega$$ Ω . The paper is focused on the analysis and verification of the theory behind this limit. We relate the results presented in this work to the application of wireless single-chip temperature monitoring of power semiconductors and conclude that such a system would be compatible with this limit.

scholarly journals Hierarchically Porous, Laser-Pyrolyzed Carbon Electrode from Black Photoresist for On-Chip Microsupercapacitors

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 2828
Author(s):  
Soongeun Kwon ◽  
Hak-Jong Choi ◽  
Hyung Cheoul Shim ◽  
Yeoheung Yoon ◽  
Junhyoung Ahn ◽  
...  
Keyword(s):  
High Performance ◽  
Thermal Reaction ◽  
Graphitic Carbon ◽  
Direct Laser Writing ◽  
Laser Writing ◽  
Experimental Conditions ◽  
Laser Pyrolysis ◽  
Direct Laser ◽  
On Chip ◽  
Carbon Dioxide Co2

We report a laser-pyrolyzed carbon (LPC) electrode prepared from a black photoresist for an on-chip microsupercapacitor (MSC). An interdigitated LPC electrode was fabricated by direct laser writing using a high-power carbon dioxide (CO2) laser to simultaneously carbonize and pattern a spin-coated black SU-8 film. Due to the high absorption of carbon blacks in black SU-8, the laser-irradiated SU-8 surface was directly exfoliated and carbonized by a fast photo-thermal reaction. Facile laser pyrolysis of black SU-8 provides a hierarchically macroporous, graphitic carbon structure with fewer defects (ID/IG = 0.19). The experimental conditions of CO2 direct laser writing were optimized to fabricate high-quality LPCs for MSC electrodes with low sheet resistance and good porosity. A typical MSC based on an LPC electrode showed a large areal capacitance of 1.26 mF cm−2 at a scan rate of 5 mV/s, outperforming most MSCs based on thermally pyrolyzed carbon. In addition, the results revealed that the high-resolution electrode pattern in the same footprint as that of the LPC-MSCs significantly affected the rate performance of the MSCs. Consequently, the proposed laser pyrolysis technique using black SU-8 provided simple and facile fabrication of porous, graphitic carbon electrodes for high-performance on-chip MSCs without high-temperature thermal pyrolysis.

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