A team of Carnegie scientists led by Timothy Strobel has synthesized an entirely new form of silicon, one that promises even greater future applications.
Silicon is the second most-abundant element in the earth’s crust. When purified, it takes on a diamond structure, which is essential to modern electronic devices—carbon is to biology as silicon is to technology. A team of Carnegie scientists led by Timothy Strobel has synthesized an entirely new form of silicon, one that promises even greater future applications. Their work is published in Nature Materials.
Although silicon is incredibly common in today’s technology, its so-called indirect band gap semiconducting properties prevent it from being considered for next-generation, high-efficiency applications such as light-emitting diodes, higher-performance transistors and certain photovoltaic devices.
Metallic substances conduct electrical current easily, whereas insulating (non-metallic) materials conduct no current at all. Semiconducting materials exhibit mid-range electrical conductivity. When semiconducting materials are subjected to an input of a specific energy, bound electrons can move to higher-energy, conducting states. The specific energy required to make this jump to the conducting state is defined as the “band gap.” While direct band gap materials can effectively absorb and emit light, indirect band gap materials, like diamond-structured silicon, cannot.
In order for silicon to be more attractive for use in new technology, its indirect band gap needed to be altered. Strobel and his team—Carnegie’s Duck Young Kim, Stevce Stefanoski and Oleksandr Kurakevych (now at Sorbonne) —were able to synthesize a new form of silicon with a quasi-direct band gap that falls within the desired range for solar absorption, something that has never before been achieved.
The silicon they created is a so-called allotrope, which means a different physical form of the same element, in the same way that diamonds and graphite are both forms of carbon. Unlike the conventional diamond structure, this new silicon allotrope consists of an interesting open framework, called a zeolite-type structure, which is comprised of channels with five-, six- and eight-membered silicon rings.
The Latest on: High-pressure precursor synthesis
via Google News
The Latest on: High-pressure precursor synthesis
- Scientists propose strategy for site-selective chiral drug synthesis in living systemson June 26, 2020 at 9:26 am
Enantioselectivity plays an important role in the pharmacological and toxicological processes of chiral drugs. In chiral drug synthesis that uses bio-orthogonal chemistry within complex biological ...
- A novel to strategy to achieve site-selective chiral drug synthesis in living systemson June 25, 2020 at 5:00 pm
In chiral drug synthesis that uses bioorthogonal chemistry within complex biological milieu, asymmetric transfer hydrogenation (ATH), which utilizes safe hydrogen donors instead of high pressure H ...
- Polycythemia and Increased Erythropoietin in a Patient With Chronic Kidney Diseaseon June 16, 2020 at 5:00 pm
In patients with renal insufficiency associated with increased hemoglobin levels and polycythemia, the possibilities of recombinant erythropoietin ... rather than high pressure hydronephrosis.
- How to Perform Liquid-Phase Exfoliation on Grapheneon June 9, 2020 at 4:05 am
In comparison, liquid-phase exfoliation does not produce the large, blemish-free sheets required for making displays and high-end electronics like CVD synthesis does ... and create both high-pressure ...
- Rationally designed indium oxide catalysts for COon June 3, 2020 at 5:00 pm
Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201203, P.R. China. 2University of Chinese Academy of Sciences, Beijing 100049, P.R. China. 3School ...
- Synthesis and characterization of Magnesium-Iron-Cobalt complex hydrideson June 2, 2020 at 2:10 am
The synthesis of quaternary deuterides, with formula Mg 2 Fe x Co (1−x) D y was achieved by Reactive Ball Milling (RBM) using a deuterium atmosphere inside the milling vial. The nominal amount ...
- Improving the mechanical behavior of reduced graphene oxide/hydroxyapatite nanocomposites using gas injection into powders synthesis autoclaveon May 22, 2020 at 2:27 am
In this study, we show the synthesis of reduced graphene oxide/hydroxyapatite (rGO/HA) composites using a hydrothermal autoclave with argon-15% hydrogen gas injection. This both increases the ...
- Deciding the Medical Management of the Patient with Urolithiasison March 22, 2018 at 10:34 pm
Some other very useful methods exist to determine the mineral composition of the uroliths as: optical crystallography by oil dip with a polarized light, difractometry of X-rays, electronic microscopy, ...
- CMI - Bibliography of Bernd Zechmannon March 30, 2016 at 10:04 am
Zechmann B. & Russell S. D. 2011. Subcellular distribution of glutathione in the gametophyte. Plant Signaling and Behavior 6: 1259-1262. 37.) Zechmann B., Koffler B. E. & Russell S. D. 2011.
via Bing News