A Korean team of scientists tune BP’s band gap to form a superior conductor, allowing for the application to be mass produced for electronic and optoelectronics devices
The research team operating out of Pohang University of Science and Technology (POSTECH), affiliated with the Institute for Basic Science’s (IBS) Center for Artificial Low Dimensional Electronic Systems (CALDES), reported a tunable band gap in BP, effectively modifying the semiconducting material into a unique state of matter with anisotropic dispersion. This research outcome potentially allows for great flexibility in the design and optimization of electronic and optoelectronic devices like solar panels and telecommunication lasers.
To truly understand the significance of the team’s findings, it’s instrumental to understand the nature of two-dimensional (2-D) materials, and for that one must go back to 2010 when the world of 2-D materials was dominated by a simple thin sheet of carbon, a layered form of carbon atoms constructed to resemble honeycomb, called graphene. Graphene was globally heralded as a wonder-material thanks to the work of two British scientists who won the Nobel Prize for Physics for their research on it.
Graphene is extremely thin and has remarkable attributes. It is stronger than steel yet many times lighter, more conductive than copper and more flexible than rubber. All these properties combined make it a tremendous conductor of heat and electricity. A defect–free layer is also impermeable to all atoms and molecules. This amalgamation makes it a terrifically attractive material to apply to scientific developments in a wide variety of fields, such as electronics, aerospace and sports. For all its dazzling promise there is however a disadvantage; graphene has no band gap.
Stepping Stones to a Unique State
A material’s band gap is fundamental to determining its electrical conductivity. Imagine two river crossings, one with tightly-packed stepping-stones, and the other with large gaps between stones. The former is far easier to traverse because a jump between two tightly-packed stones requires less energy. A band gap is much the same; the smaller the gap the more efficiently the current can move across the material and the stronger the current.
Graphene has a band gap of zero in its natural state, however, and so acts like a conductor; the semiconductor potential can’t be realized because the conductivity can’t be shut off, even at low temperatures. This obviously dilutes its appeal as a semiconductor, as shutting off conductivity is a vital part of a semiconductor’s function.
Birth of a Revolution
Phosphorus is the fifteenth element in the periodic table and lends its name to an entire class of compounds. Indeed it could be considered an archetype of chemistry itself. Black phosphorus is the stable form of white phosphorus and gets its name from its distinctive color. Like graphene, BP is a semiconductor and also cheap to mass produce. The one big difference between the two is BP’s natural band gap, allowing the material to switch its electrical current on and off. The research team tested on few layers of BP called phosphorene which is an allotrope of phosphorus.
The Latest on: Black Phosphorus
via Google News
The Latest on: Black Phosphorus
- Ackerman’s latest is a tense tale from Turkeyon July 1, 2020 at 12:16 pm
If you know your Bosphorus from phosphorus and Gezi Park means something to you, you’ll probably love Elliot Ackerman’s new novel. If the strait that separates the European and Asian parts of Turkey ...
- Engineers advance insights on black phosphorus as a material for future ultra-low power flexible electronicson June 17, 2020 at 4:33 am
Black phosphorus is a crystalline material that is attracting growing research interest from semiconductor device engineers, chemists and material scientists to create high-quality atomically thin ...
- Scientists discover a long-sought-after nitrogen allotrope in black phosphorus structureon June 16, 2020 at 7:28 am
Phosphorene is a typical 2D material derived from the buckled honeycomb layers of black phosphorus. It exhibits a number of unusual electronic, mechanical, optical, and transport properties with ...
- Anaerobically disinfect soil to increase phosphorus using diluted ethanolon June 15, 2020 at 6:46 am
Japan is lucky in that about half of its landmass is covered in this rich, black, productive soil. However, this soil absorbs phosphorus considerably making them unavailable to plants to use as ...
- Scientists Have Created Black Nitrogenon June 5, 2020 at 1:07 am
The name “black nitrogen” is from similar allotrope black phosphorus, which American Elements describes as “a layered semiconducting material similar in appearance to graphite with numerous ...
- Scientists Have Created Black Nitrogenon June 4, 2020 at 11:02 am
The name “black nitrogen” is from similar allotrope black phosphorus, which American Elements describes as “a layered semiconducting material similar in appearance to graphite with numerous uses in ...
- Nitrogen in black phosphorus structureon June 3, 2020 at 11:18 am
These authors contributed equally to this work. See allHide authors and affiliations Group V elements in crystal structure isostructural to black phosphorus with unique puckered two-dimensional layers ...
- Discovery of Black Nitrogen Resolves A Longstanding Chemical Anomalyon June 3, 2020 at 5:07 am
A paper in Physical Review Letters changes that, describing a crystalline state of nitrogen that resembles black phosphorus. Nitrogen's column in the periodic table and those on either side ...
via Bing News