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- 2019
- low-temperature electronics
- junction field-effect transistors
- differential operational amplifier
- LTspice environment
- differential stage
- common-mode rejection ratio
- class AB operation
- optimization of analog electronic circuit
- operational amplifier
- LTspice environment
- Electronic Science and Technology
- Don State Technical University
- Southern Federal University
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Hot-substrate deposition of all-inorganic perovskite films for low-temperature processed high-efficiency solar cells
摘要： All-inorganic cesium lead halide perovskites (CsPbX3) have emerged as one of the most promising photovoltaic materials due to their superior thermal stability. However, the high phase transition temperatures (typically over 250 ?C) of CsPbX3 perovskites are incompatible with flexible substrates. Herein, we employed a simple hot-casting method to fabricate low-temperature processed CsPbI2Br films. By casting the perovskite precursor solution onto a hot substrate (maintained at 55 ?C), compact, large-grain and pinhole-free CsPbI2Br films can be prepared at a low post-annealing temperature, which outperform the conventional room temperature (RT)-casting and high-temperature (post-annealing at 340 ?C) processed CsPbI2Br films containing some voids. As a result, the hot-casting and low-temperature (post-annealing at 120 ?C) processed CsPbI2Br perovskite solar cells (PSCs) exhibited an outstanding power conversion efficiency (PCE) of 12.5%, which is much higher than that (2.91%) of the RT-casting processed CsPbI2Br devices. Further optimization of the post-annealing temperature (optimized value: 180 ?C) yielded the best performance of 13.8% for hot-casting processed CsPbI2Br devices. This study gives an effective and facile strategy toward low-temperature processed all-inorganic perovskite films and high-performance PSCs.
关键词： hot-casting method,All-inorganic cesium lead halide perovskites,perovskite solar cells,low-temperature processed,CsPbI2Br
更新于2025-09-11 14:15:04
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[IEEE 2019 Cross Strait Quad-Regional Radio Science and Wireless Technology Conference (CSQRWC) - Taiyuan, China (2019.7.18-2019.7.21)] 2019 Cross Strait Quad-Regional Radio Science and Wireless Technology Conference (CSQRWC) - High Performance Germanium n <sup>+</sup> /p Shallow Junction for nano-Scaled n-MOSFET
摘要： In this work, we study excimer laser annealing (ELA) on phosphorus-implanted germanium with implantation energies and doses of 30 keV, 5x1015 cm-2, and 10 keV, 5x1014 cm-2, respectively. A lower specific contact resistivity of Al/n+Ge and better performance of Ge n+/p diode than that obtained by rapid thermal annealing have been fulfilled. Moreover, by a combination of low temperature pre-annealing (LTPA) and ELA, we achieved a Ge n+/p diode with a rectification ratio of about 107 and decreased phosphorus diffusion in Ge during ELA. A increased activation concentration up to 6x1019cm-3 with a high activation ratio about 85% of phosphorus have been achieved in a low ion implanted dose and energy.
关键词： low temperature pre-annealing,excimer laser annealing,germanium,shallow junction
更新于2025-09-11 14:15:04
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3D Printing of Highly Conductive Silver Architectures Enabled to Sinter at Low Temperatures
摘要： Silver (Ag) nanoparticle-based inks are frequently used in printed electronics to form conductive patterns, but often require high-temperature sintering to achieve the optimum electrical conductivity, hindering their use in substrates with poor heat resistance. Herein, a three-dimensional (3D) printing strategy to produce highly conductive Ag 3D architectures that can be sintered at low temperatures is reported. This strategy is based on the additive deposition of Ag nanoparticles and microflakes via extrusion-based 3D printing with the Ag ink that involves poly(acrylic acid) (PAA)-stabilized Ag nanoparticles, Ag microflakes, and NaCl - a destabilizing agent. The designed Ag inks are stable and suitable for ink-extrusion 3D printing. In chemical sintering, Cl- can detach PAA from the Ag nanoparticle surface, enabling nanoparticle coalescence and sintering. An elevated annealing temperature induces increased NaCl density in the printed patterns and accelerates the surface and grain boundary diffusion of Ag atoms, contributing to enhance chemical sintering. On annealing at ~110 °C for 30 min, the printed structures exhibited an electrical conductivity of ~9.72 × 104 S cm–1, which is ~15.6% of that of bulk Ag. Complicated Ag architectures with diverse shapes were successfully fabricated on polymeric substrates. Several structural electronic applications were demonstrated by hybrid 3D printing combining our extrusion-based 3D printing and conventional fused deposition modeling (FDM).
关键词： Conductive inks,3D printing,3D printed electronics,Low temperature,Silver 3D architecture,Chemical sintering
更新于2025-09-11 14:15:04
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Quantum dot thermometry at ultra-low temperature in a dilution refrigerator with a <sup>4</sup> He immersion cell
摘要： Experiments performed at a temperature of a few millikelvins require effective thermalization schemes, low-pass filtering of the measurement lines, and low-noise electronics. Here, we report on the modifications to a commercial dilution refrigerator with a base temperature of 3.5 mK that enable us to lower the electron temperature to 6.7 mK measured from the Coulomb peak width of a quantum dot gate-defined in an [Al]GaAs heteostructure. We present the design and implementation of a liquid 4He immersion cell tight against superleaks, implement an innovative wiring technology, and develop optimized transport measurement procedures.
关键词： quantum dot thermometry,ultra-low temperature,dilution refrigerator,4He immersion cell
更新于2025-09-11 14:15:04
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Low temperature phase-controlled synthesis of titanium di- and tri-sulfide by atomic layer deposition
摘要： Phase-controlled synthesis of two-dimensional (2D) transition metal chalcogenides (TMCs) at low temperature with a precise thickness control has to date been rarely reported. Here, we report on a process for the phase-controlled synthesis of TiS2 (metallic) and TiS3 (semiconducting) nano-layers by atomic layer deposition (ALD) with precise thickness control. The phase-control has been obtained by carefully tuning the deposition temperature and co-reactant composition during ALD. In all cases, characteristic self-limiting ALD growth behavior with a growth per cycle (GPC) of ~0.16 nm per cycle was observed. TiS2 was prepared at 100 °C using H2S gas as co-reactant, and was also observed using H2S plasma as co-reactant at growth temperatures between 150 and 200 °C. TiS3 was only synthesized at 100 °C using H2S plasma as co-reactant. The S2 species in the H2S plasma, as observed by optical emission spectroscopy, has been speculated to lead to the formation of the TiS3 phase at low temperature. The control between synthesis of TiS2 and TiS3 was elucidated by Raman spectroscopy, X-ray photoelectron spectroscopy, high-resolution electron microscopy, and Rutherford back scattering studies. Electrical transport measurements showed the low resistive nature of ALD grown 2D-TiS2 (1T-phase). Post-deposition annealing of the TiS3 layers at 400 °C in a sulfur-rich atmosphere improved the crystallinity of the film and yielded photoluminescence at ~0.9 eV, indicating the semiconducting (direct bandgap) nature of TiS3. The current study opens up a new ALD-based synthesis route for controlled, scalable growth of transition metal di- and tri-chalcogenides at low temperatures.
关键词： phase-controlled synthesis,low temperature,titanium sulfide,transition metal chalcogenides,atomic layer deposition
更新于2025-09-11 14:15:04
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[IEEE 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting - Atlanta, GA, USA (2019.7.7-2019.7.12)] 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting - Grounded Coplanar Waveguide-Fed Millimeter Wave Volumetric Pyramidal Horn on LTCC
摘要： There is a strong interest to implement antenna-in-package (AiP) systems for a variety of applications such as imaging, beamforming, integrated transceivers, and radars. Substrate integrated horn antennas are valuable AiP candidates due to their small form factor, ease of integration, and high gain. Alternatively, a volumetric packaging approach can significantly reduce the antenna’s form factor and enhance the gain. For the first time, in this paper, we present a 94 GHz low temperature cofired ceramic (LTCC) integrated volumetric pyramidal horn antenna. Using a vertical LTCC approach, a GCPW-fed single horn antenna was designed. Results show that the antenna operates from 91.6 GHz to 95.6 GHz for S11 <10 dB, with a realized gain of 8.7 dBi.
关键词： Antenna in Package,Low Temperature Co-fired Ceramic (LTCC),Volumetric Horn Antenna,94 GHz
更新于2025-09-11 14:15:04
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Chemodrug-Gated Biodegradable Hollow Mesoporous Organosilica Nanotheranostics for Multimodal Imaging-Guided Low-Temperature Photothermal Therapy/Chemotherapy of Cancer
摘要： Non-invasive physical treatment with relatively low intensity stimulation and the development of highly efficient anticancer medical strategy are still desirable for cancer therapy. Herein, a versatile biodegradable hollow mesoporous organosilica nanocapsule (HMONs) nananoplatform that is capped by the gemcitabine (Gem) molecule through a pH-sensitive acetal covalent bond is designed. The fabricated nanocapsule exhibits desirable small molecule release at the tumor tissues/cell sites, shows a reduced potential for drug accumulation risk. After loading indocyanine green (ICG), the heat-shock protein 90 (Hsp 90) inhibitor, 17AAG and modification with polyethylene glycol (NH2-PEG), the resulting ICG-17AAG@HMONs-Gem-PEG exhibited a precisely controlled release of ICG and 17AAG and low-temperature photothermal therapy (PTT) (~41 °C) with excellent tumor destruction efficacy. In addition, ICG loaded conferring the nanoplatform with near-infrared fluorescence imaging (FL) and photoaccoustic (PA) imaging capability. In short, this work not only presents a smart drug self-controlled nanoplatform with pH-responsive payloads released and theranostic performance, but also provides an outstanding low-temperature PTT strategy, which is highly valid in inhibition of cancer cells with minimal damage to the organism. Therefore, this research provides a paradigm that has a chemodrug-gated HMONs-based theranostic nanoplatform with intrinsic biodegradability, multimodal imaging capacity, high low-temperature PTT/chemotherapy efficacy and reduced systemic toxicity.
关键词： biodegradability,nanotheranostics,Hollow mesoporous organosilica,chemodrug gatekeeper,low-temperature photothermal therapy
更新于2025-09-11 14:15:04
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Uniform Insulating Properties of Low-Temperature Curable Gate Dielectric for Organic Thin-Film Transistor Arrays on Plastic Substrate
摘要： Achieving a high-resolution display on a plastic substrate requires a to ensure dimensional stability during fabrication process, including the deposition of gate dielectrics. Evaluation platform to confirm the uniform insulating properties of organic dielectric material prior to actual application to organic thin-film transistor (OTFT) arrays was proposed. This test method enabled verification of the suitability of the low-temperature curable dielectric and chemical resistance during fabrication process. A cross-linked poly(hydroxy imide) (PHI) that can be cured at a low temperature of 130°C exhibited stable insulating properties in a large area that sudden breakdown was not observed in an electric field up to 4 MV/cm. Thiophene-thiazole-based copolymer semiconductor was used as an active layer and inkjet-printed. In all the processes, the temperature of the substrate was kept below 130°C, and 4.8-inch electrophoretic display panels on a polyethylene naphthalate (PEN) substrate with a resolution of 98 dpi was demonstrated.
关键词： Organic thin-film transistors,Organic gate dielectric,Plastic substrates,Low-temperature process,Polymer semiconductor,Flexible displays,Inkjet printing
更新于2025-09-10 09:29:36
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Crystal structure, microwave dielectric properties and low temperature sintering of (Al0.5Nb0.5)4+ co-substitution for Ti4+ of LiNb0.6Ti0.5O3 ceramics
摘要： The phase composition, microstructure, microwave dielectric properties of (Al0.5Nb0.5)4+ co-substitution for Ti site in LiNb0.6Ti0.5O3 ceramics and the low temperature sintering behaviors of Li2O-B2O3-SiO2 (LBS) glass were systematically discussed. XRD patterns and EDS analysis result confirmed that single phase of Li1.075Nb0.625Ti0.45O3 solid solution was formed in all component. The increase of dielectric constant (εr) is ascribed to the improvement of bulk density. The restricted growth of grain has a negative influence on quality factor (Q×f) value. The τf value could be continuously shifted to near zero as the doping content increases. Great microwave dielectric properties were obtained in LiNb0.6Ti(0.5-x)(Al0.5Nb0.5)xO3 ceramics (x = 0.10) when sintered at 1100℃ for 2 h: εr = 70.34, Q×f = 5144 GHz, τf = 4.8ppm/℃. The sintering aid, LBS glass, can effectively reduce the temperature and remain satisfied microwave performance. Excellent microwave dielectric properties for x = 0.10 were obtained with 1.0 wt. % glass: εr = 70.16, Q×f = 4153 GHz (at 4 GHz), τf = -0.65ppm/℃ when sintered at 925℃ for 2 h.
关键词： LiNb0.6Ti0.5O3 ceramics,low temperature sintering,Li2O-B2O3-SiO2 (LBS) glass,microwave dielectric properties
更新于2025-09-10 09:29:36
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Low temperature thermoluminescence anomaly of LiF:Mg,Cu,P radiation detectors exposed to 1H and 4He ions
摘要： Lithium fluoride thermoluminescent radiation detectors with different dopant concentrations (7LiF:Mg,Ti and 7LiF:Mg,Cu,P) were exposed to 1H and 4He ions at the Heavy Ion Medical Accelerator in Chiba (HIMAC) in order to investigate their response to energetic light charged particles. Computer simulations with the Monte Carlo code PHITS were performed for a better interpretation of the experimental data. The results were compared with literature efficiency data and with the results of a recently developed microdosimetric efficiency model. In case of the main peak signal of 7LiF:Mg,Ti detectors, the determined efficiency values are in good agreement with previous investigations. Discrepancies in the efficiency of high temperature signal due to well-known non-linearity effects are reported. For 7LiF:Mg,Cu,P detectors, an anomalous thermoluminescence behavior in the low temperature part of the signal was found and discussed. Depending on the light quantification process, differences up to 30% in the dose assessment can be obtained, affecting also the relative efficiency determination process. An explanation of this phenomenon as a consequence of local migration of the charged carriers between the low temperature peaks and the main peak is presented. The implications of these findings on the use of LiF:Mg,Cu,P detectors in radiation environments characterized by the presence of 1H and 4He ions (i.e. space and proton therapy) are discussed. In order to avoid the occurrence of this anomalous behavior, it is advised to pre-heat the detectors after energetic light particle exposures.
关键词： PHITS,LiF,Microdosimetric modeling,Efficiency,Mg,Ti,Mg,Cu,P,TLD,Low temperature anomaly
更新于2025-09-10 09:29:36