Engineering
A large-scale (4-inch), highly uniform, and defect-free plasma etching technology, which will likely become the foundation of the industrial supply of molybdenum disulfide (MoS2), a next-generation two-dimensional (2D) semiconductor, ...
Jun 22, 2023
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18
Energy & Green Tech
Many owners of electric vehicles worry about how effective their battery will be in very cold weather. Now a new battery chemistry may have solved that problem.
May 17, 2023
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165
Electronics & Semiconductors
One of the first sights greeting visitors to Pacific Northwest National Laboratory's (PNNL's) Energy Sciences Center are windows into busy lab spaces. Filled with equipment and researchers going about their work, the film ...
Mar 22, 2023
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17
Engineering
For more than three decades, photovoltaic researchers have known that the addition of a single chemical—cadmium chloride—creates better-performing cadmium telluride (CdTe) solar cells. But they have not understood exactly ...
Feb 22, 2023
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11
Engineering
In circuitry, etching is used to remove the deformed layer created during the grinding and polishing of metal components by selective chemical reactions. Now, a research group at Nagoya University in Japan has developed a ...
Feb 22, 2023
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51
Electronics & Semiconductors
The semiconductor industry has been growing steadily ever since its first steps in the mid-twentieth century and, thanks to the high-speed information and communication technologies it enabled, it has given way to the rapid ...
Jun 16, 2022
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42
Electronics & Semiconductors
Haste makes waste, as the saying goes. Such a maxim may be especially true of batteries, thanks to a new study that seeks to identify the reasons that cause the performance of fast charged lithium-ion batteries to degrade ...
Dec 2, 2021
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226
Energy & Green Tech
The operator of the tsunami-wrecked Fukushima nuclear power plant said Wednesday that a data simulation of its planned release of treated radioactive water into the sea suggests it would have an extremely small impact on ...
Nov 17, 2021
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3
Energy & Green Tech
Researchers at the U.S. Department of Energy's National Renewable Energy Laboratory (NREL) and Colorado School of Mines are applying a new technique to identify defects in silicon solar cells that cause a drop in efficiency. ...
Oct 19, 2021
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1732
Energy & Green Tech
Perovskite is a promising material. It captures the sun's rays and efficiently converts them into solar energy. It is also much cheaper than the current generation of silicon solar cells. But why are the Dutch rooftops not ...
Oct 14, 2021
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11
In quantum mechanics, perturbation theory is a set of approximation schemes directly related to mathematical perturbation for describing a complicated quantum system in terms of a simpler one. The idea is to start with a simple system for which a mathematical solution is known, and add an additional "perturbing" Hamiltonian representing a weak disturbance to the system. If the disturbance is not too large, the various physical quantities associated with the perturbed system (e.g. its energy levels and eigenstates) can, from considerations of continuity, be expressed as 'corrections' to those of the simple system. These corrections, being 'small' compared to the size of the quantities themselves, can be calculated using approximate methods such as asymptotic series. We can therefore study the complicated system based on our knowledge of the simpler one.
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