Energy & Green Tech
A new method could enable researchers to fabricate more efficient and longer lasting perovskite solar cells, LEDs and photodetectors. By growing thin perovskite films on substrates with different compositions, engineers at ...
Jan 9, 2020
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Energy & Green Tech
A team of researchers have collaborated to characterize electron-hole separation in the light-absorbing layer of kesterite thin-film solar cells. This study is expected to improve the efficiency of solar cells and promote ...
May 8, 2024
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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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Electronics & Semiconductors
A review published in the journal National Science Review summarizes the research of a team led by Prof. Huaxiang Yin (Institute of Microelectronics of Chinese Academy of Sciences). They systemically reviewed the development ...
Mar 22, 2024
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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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Engineering
Southwest Research Institute and The University of Texas at San Antonio are working together to understand the susceptibility of additively manufactured materials to hydrogen embrittlement, a common problem that can lead ...
Jul 22, 2019
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Machine learning & AI
Time to stock up on tissues.
Nov 13, 2019
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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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