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- 2018
- thin-film transistors
- N2O plasma treatment.
- amorphous InGaZnO
- gate-bias stress
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- Electronic Science and Technology
- Peking University
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Improved stress-cracking resistance of laser welded amorphous thermoplastics by means of adapted wavelengths
摘要： Laser transmission welding is widely used for the creation of strong, hermetic and optically appealing joints between thermoplastic parts. Amorphous polymers like polycarbonate and poly(methyl methacrylate) offer excellent optical properties, making them suitable for this joining technique and especially attractive for lighting and decorative applications, for example in the automotive industry. However, the rapid and non-uniform temperature changes during the process can lead to residual stresses, which can impair weld strength and result in part failure due to environmental stress cracking. In this work it was found, that the application of 2 μm laser radiation can lead to reduced stress-cracking-susceptibility compared to conventional laser transmission welding with wavelengths of ~1 μm.
关键词： amorphous polymers,residual stresses,environmental stress cracking,laser transmission welding
更新于2025-09-16 10:30:52
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Thermal Activation of Boron- and Phosphorus-Doped Amorphous Silicon and the Contribution to Improved Efficiency in Hydrogenated Amorphous Silicon Solar Cells
摘要： Hydrogenated amorphous silicon (a-Si:H) is an interesting candidate as an absorber material for solar cells. Despite the wealth of research to improve the e?ciency of a-Si:H solar cells by improving either the material quality of the absorber layer or by means of light trapping approaches, e?orts to improve the e?ciency by means of doped layer manipulation are relatively rare. In this work, single-junction a-Si:H solar cells with improved e?ciency due to thermal activation of doped layers via thermal annealing will be presented. Temperature-dependent dark conductivity measurements revealed that p- and n-type doped a-Si:H materials show di?erent equilibrium temperatures. External quantum e?ciency at di?erent annealing temperatures revealed that front surface collection probability was improved with the activation of a p layer, after which the collection probability of the back surface was improved with the activation of an n layer.
关键词： Dopant activation,Amorphous silicon,Solar cells
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale (3M-NANO) - Zhenjiang, China (2019.8.4-2019.8.8)] 2019 IEEE International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale (3M-NANO) - Simulation of Local Laser Annealing of Amorphous TiNiCu Alloy to Create Nanostructured Functional Material
摘要： Present work considers simulation via Comsol Multiphysics software of local laser annealing of amorphous TiNiCu thin ribbon to create a layered nanostructured crystalline-amorphous functional material with the two-way shape memory effect, which is intended for manufacturing of the nanoactuator. Several simulations were performed with different parameters of laser radiation, such as pulse duration and power density. Laser treatment was simplified as a boundary heat source at sample surface.
关键词： liquid,crystalline state,laser treatment,nanotweezers,Comsol Multiphysics,amorphous,state,shape memory effect,quenching
更新于2025-09-16 10:30:52
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Simulation and analysis on device parameter variations of single junction hydrogenated amorphous silicon solar cell
摘要： A novel single junction amorphous silicon solar cell is investigated by numerical simulation tool AFORS-HET to understand the influence of various parameters such as bandgap, different layer thickness, doping concentrations of P and N layers, transparent conducting oxides as textured and plane surfaces with graded structures on efficiency of solar cell. The trade-off between input parameters were examined in terms of short circuit current density (Jsc), open circuit voltage (Voc), Fill Factor (FF) and efficiency (η) as a function of different structural variations for efficiency enhancement. The systematic approach from front to back layer is investigated and the output parameters are tabulated with varied layer configurations to get clear understanding on the relative improvements over the input parameter variations. Simulated results show that maximum of 8.04% and 11.03% efficiency is seen by graded and textured structures respectively compared to maximum 3.46% efficiency of standard p-i-n structure. A structure with combination of graded and textured layers could provide maximum efficiency up to 19.08% is presented.
关键词： Amorphous silicon,AFORS HET,a-Si:H parameters,P-I-N solar cell,Thin film,Photovoltaics
更新于2025-09-16 10:30:52
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Through Concentration Profiling of Heterojunction Solar Cells
摘要： Electrochemical capacitance–voltage profiling has been used to examine heterojunction solar cells based on single-crystal silicon. Specific features of the electrochemical capacitance–voltage profiling of modern multilayer heterojunction solar cells have been analyzed. The distribution profiles of majority carriers across the whole thickness of the samples were obtained, including, for the first time, those in layers of conducting indium tin oxide.
关键词： electrochemical capacitance–voltage profiling,single-crystal silicon,amorphous silicon,heterojunction solar cells
更新于2025-09-16 10:30:52
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Hybrid External Cavity Laser with an Amorphous Silicon-Based Photonic Crystal Cavity Mirror
摘要： The authors present results on the performance of a hybrid external cavity photonic crystal laser-comprising semiconductor optical ampli?er, and a 2D photonic crystal cavity fabricated in low-temperature amorphous silicon. The authors demonstrate that lithographic control over amorphous silicon photonic crystal cavity-resonant wavelengths is possible, and that single-mode lasing at optical telecommunications wavelengths is possible on an amorphous silicon platform.
关键词： nanophotonics,silicon photonics,amorphous silicon,CMOS processing,photonic crystals,telecommunications,lasers
更新于2025-09-16 10:30:52
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Amorphous ZnO/PbS quantum dots heterojunction for efficient responsivity broadband photodetectors
摘要： The integration of lead sulfide quantum dots (QDs) with high conductivity material that is compatible with a scalable fabrication is an important route for the applications of QDs based photodetectors. Herein, we firstly developed a broadband photodetector by combining amorphous ZnO and PbS QDs forming a heterojunction structure. The photodetector showed detectivities up to 7.9x1012 jones and 4.1x1011 jones under 640 nm and 1310 nm illumination, respectively. The role of oxygen background pressure on the electronic structure of ZnO films grown by pulsed laser deposition was systematically studied, and it was found to play an important role on the conductivity, associated to the variation of oxygen vacancy concentration. By increasing the oxygen vacancy concentration, the electron mobility of amorphous ZnO layers dramatically increased and work function decreased, which were beneficial for the photocurrent enhancement of ZnO/PbS QDs photodetectors. Our results provide a simple and highly scalable approach to develop broadband photodetectors with high performance.
关键词： oxygen vacancy,amorphous ZnO,broadband photodetector,mobility,heterojunction
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Modeling Methodology for Determining Energy Collection Potential of Photovoltaics Applied To Curved Surfaces
摘要： Arrays of periodic one-dimensional nanomaterials offer tunable optical properties in terms of light–matter interaction which are attractive for designing efficient optoelectronic devices. This paper presents a fabrication of bottom-up grown nanopillar (NP) array solar cells based on n-i-p thin-film amorphous silicon using scaffolds of vertically aligned carbon nanotube (CNT) array. The effects of varying the CNT spacing over the range from 800 to 2000 nm on optical and electrical properties of the solar cells were investigated. The NP solar cell with CNT spacing of 800 nm exhibited ‘moth-eye’ broadband antireflection behavior, showing an average reflectance value lower than 10%. The enhanced optical absorption translated to significant enhancements in photocurrent and quantum efficiency compared to a conventional planar solar cell under low light condition. The open-circuit voltage (Voc) of the NP solar cell was found systematically correlated with the CNT spacing and the illumination condition. The results presented here is of importance for developing high efficiency one-dimensional nanostructured solar cells.
关键词： photovoltaic cells,nanostructured materials,nanophotonics,Amorphous silicon,carbon nanotube (CNT)
更新于2025-09-16 10:30:52
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Achieving efficient flexible perovskite solar cells with room-temperature processed tungsten oxide electron transport layer
摘要： For flexible perovskite solar cells, achieving high power conversion efficiency by using a room-temperature technology to fabricate a compact electron transport layer is one of the best options. Here, we develop an annealing-free, dopant-free, and amorphous tungsten oxide as electron transport layer by vacuum evaporation for flexible perovskite solar cells. The compact amorphous tungsten oxide electron transport layer with different thicknesses (0–50 nm) was directly deposited on flexible PEN/ITO substrate. A model of the improvement mechanism is proposed to understand how the thickness tailoring simultaneously enhances the crystallization and relaxes the trade-off between interface recombination and charge transfer. By optimizing the amorphous tungsten oxide thickness, the high homogeneous, uniform, and dense electron transport layer with a thickness of 30 nm is found to not only decrease the pinhole of the perovskite layer, but also enhance charge transport with reducing resistance. Furthermore, the mechanical bending stability revealed that, the fabricated perovskite solar cells show stable power conversion efficiency up to more than 1000 bending cycles. The room-temperature processed fabrication enables the amorphous tungsten oxide to become a potential electron transport layer candidate for the large-scale flexible perovskite solar cells, which becomes compatible with practical roll-to-roll solar cells manufacturing.
关键词： Electron transport layer,Amorphous tungsten oxides,Low temperature,Flexible solar cells,Interface recombination
更新于2025-09-16 10:30:52
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Ultrathin Nano-Absorbers in Photovoltaics: Prospects and Innovative Applications
摘要： Approaching the first terawatt of installations, photovoltaics (PV) are about to become the major source of electric power until the mid-century. The technology has proven to be long lasting and very versatile and today PV modules can be found in numerous applications. This is a great success of the entire community, but taking future growth for granted might be dangerous. Scientists have recently started to call for accelerated innovation and cost reduction. Here, we show how ultrathin absorber layers, only a few nanometers in thickness, together with strong light confinement can be used to address new applications for photovoltaics. We review the basics of this new type of solar cell and point out the requirements to the absorber layer material by optical simulation. Furthermore, we discuss innovative applications, which make use of the unique optical properties of the nano absorber solar cell architecture, such as spectrally selective PV and switchable photovoltaic windows.
关键词： switchable solar cell,spectrally selective solar cell,absorption enhancement,ultrathin absorber,amorphous germanium
更新于2025-09-16 10:30:52