- 标题
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Efficient flexible Mo foil-based Cu2ZnSn(S, Se)4 solar cells from In-doping technique
摘要： Cation substitution has an important impact on the power conversion efficiency (PCE) of Cu2ZnSn(S,Se)4 (CZTSSe) solar cells. Herein, a significant PCE enhancement of flexible indium-doped CZTSSe solar cells has been achieved by partially substituting Sn4+ with In3+. Systematic measurements indicate that In doping in CZTSSe film effectively improves the crystallinity and carrier concentration of the absorber layer. Meanwhile, the treatment reduces interface recombination and band tailing by passivating deep defects and increases the open-circuit voltage (Voc) of the solar cells. By physical analysis, the key parameters for the solar cell diode such as A, J0, Rs and Rsh are significantly improved after In-doping, indicating better PN junction quality. Under the optimal In-doping (x ? In/(Sn t In) ? 9%), the flexible Cu2ZnSn1-xInx(S,Se)4 solar cell has been successfully obtained with the best efficiency of 7.19% and the Voc enhancement of 62 mV due to reduced Voc deficit and band tailing.
关键词： Solution process,In dopant,Mo foil,Flexible CZTSSe solar cells
更新于2025-09-19 17:13:59
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Dislocation Mass-Transfer and Electrical Phenomena in Metals under Pulsed Laser Influence
摘要： The influence of moving dislocations on mass-transfer and the phenomena, accompanying it in pulse-deformed metals is studied in a real-time. Transport of self-interstitial atoms (SIAs) by mobile edge dislocations in crystal with FCC lattice is investigated by molecular dynamics. A strain rate (106 s-1) and dislocation density (1010 – 1012 cm-2) in simulated crystal corresponds to a laser effect in a Q-factor mode. The experimental investigations in a real-time are performed by recording of electrical signal induced by the laser pulse irradiation of metal foils of different crystal structures.
关键词： stresses,amorphous foil,dislocation,laser pulse,electrokinetic phenomena,interstitial atom,mass-transfer,elastic field,strain
更新于2025-09-16 10:30:52
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[IEEE 48th European Solid-State Device Research Conference (ESSDERC 2018) - Dresden (2018.9.3-2018.9.6)] 2018 48th European Solid-State Device Research Conference (ESSDERC) - Low Profile Open MEMS and ASIC Packages manufactured by Flexible Hybrid Integration in a Roll-to-Roll compatible process
摘要： Here we report on a flexible, foil based packaging process in which a standard commercially available MEMS capacitive air pressure sensor is packaged in an “open package” configuration such that the sensitive membrane side of the MEMS is always in contact with the ambient atmosphere. Additionally, the matching ASIC chip to readout the MEMS sensor is integrated into the same package in a System-in-Foil (SiF) configuration. Here, both the MEMS and the ASIC wafers were thinned down to 250 μm, which resulted in a combined package height profile of < 0.5 mm. This foil based patch sensor has then been characterized in ambient air and its performance has been compared against a commercial MEMS (bare die) sensor available as standard Surface Mounted Device (SMD) component having a package height of 1 mm. The electrical performance and the functionality under thermal cycling and thermal shocks of these packaged sensors were found to be identical to the commercially available SMD variant. Furthermore, to demonstrate the applicability of such a thin, flexible foil sensor patch in the field of ?non-invasive“ air pressure measurements on planar and curved surfaces, these sensors were mounted onto the carrosserie of a car at different locations and the air pressure change due to the laminar / non-laminar flow of air (or air turbulence) over these control surfaces were measured. The results further verify the need for such low profile packaging such that the airflow over control surfaces can be measured without disturbing the laminar airflow. This opens up the application field of these packaged sensors for wind turbines, aircraft wings, skyscrapers/buildings and automotive applications.
关键词： System-in-Foil (SiF),Flexible Packaging,Chip-in-Foil (CiF),Flexible Hybrid Electronics (FHE),Roll-to-Roll (R2R)
更新于2025-09-09 09:28:46
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A Feasibility Study of Controllable Gas Foil Bearings With Piezoelectric Materials Via Rotordynamic Model Predictions
摘要： This study presents a new concept of controllable gas foil bearings (C-GFBs) with piezoelectric actuators. The C-GFB consists of a laminated top foil, bump foil, and piezo stacks and can simply change the bearing shape or film thickness locally and globally by varying the thickness of the piezo stacks with input voltages. The control schemes are (1) clearance control: the bearing clearance adjusted by changing overall piezo stack thickness, and (2) preload control: the mechanical preload modulated by the thickness expansion of several piezo stacks. Bearing lubrication performance is predicted for four cases of C-GFBs with different bearing clearances and preloads. The piezo stack control generates meaningful differences in the fluid-film thickness and pressure. Clearance control has a great effect on the dynamic force coefficients, but preload control slightly increases. Furthermore, the rotordynamic prediction of a rotor supported on two journal C-GFBs is conducted. As a result, both control modes for C-GFB are found to have a positive effect on rotordynamic amplitudes. Finally, using the orbit simulations, the C-GFB is controlled to have a small bearing clearance and large preload at critical speeds to make it possible to stably pass through the critical speeds. Consequently, it turns out that the C-GFB can improve bearing lubrication and rotordynamic performances by controlling only the input voltage of the piezo stacks. In addition, the C-GFB can be used to form various shapes to meet the operation conditions of an applied system.
关键词： active gas bearing,rotordynamic instability,piezoelectric actuator,vibration control,gas foil bearing
更新于2025-09-09 09:28:46
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Experimental study of proton acceleration from thin-foil on a table top Ti:Sapphire
摘要： Table-top lasers of moderate energies (0.1- 0.5 J) are promising, cost-effective laser-driven sources of MeV-energy protons and ions accelerators, but many applications of laser-accelerated ion beams will not only require a low cost, compact system but also require operation at high repetition rates (>10 Hz). This paper focus the effort to characterize and optimize proton acceleration processes using 3 TW/55 fs, table-top Ti:Sapphire (Ti:Sa) laser capable to operate at 10 Hz, with this intention the maximum proton energy obtained, in a single shot, was evaluated by irradiating a variety of flat targets, from thin film to sub-micrometric film membranes designed for our purposes in a high density target array. The presented work is a previous stage and this study has the intention to be the prelude of the technological challenge, both in laser technology as well target design capable of operating at high repetition rates.
关键词： Ti:Sapphire laser,proton acceleration,thin-foil targets,high repetition rates
更新于2025-09-09 09:28:46
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Forward projection matrix derivation through Monte-Carlo ray-tracing of KSTAR infra-red imaging video bolometer (IRVB)
摘要： The infrared imaging video bolometer (IRVB) as a foil bolometry technique can be an alternative solution to the conventional resistive bolometer due to its electro-magnetic immunity and 2D plasma profiles. The plasma profile of the IRVB cannot be directly derived from the foil images due to the difference between the foil pixel number and the plasma pixel number and the line integrated nature of the incident rays on the foil. So, it needs tomography such as the Phillips-Thikhonov algorithm. The projection matrix constructing the foil image from the plasma very directly influences the tomography. So, the projection matrix needs to be constructed precisely. For the technique calculating the precise projection matrix, a forward Monte-Carlo ray-tracing method is proposed here, and this technique can provide the detailed descriptions of the foil image. And it can give enhanced performance in the reconstructions of the plasmas with spatially localized power.
关键词： infrared imaging video bolometer,projection matrix,IRVB,foil bolometry,Monte-Carlo ray-tracing,plasma profile reconstruction
更新于2025-09-04 15:30:14