Black Phosphorus Made More Tunable Than Graphene

This is another finding asking for a good "Mathis" style explanation of the effects:
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Black Phosphorus Made More Tunable Than Graphene

A research team from South Korea develops black phosphorous, which has better semiconducting properties compared to graphene.

Asian Scientist Newsroom | August 19, 2015 | In the Lab

AsianScientist (Aug. 19, 2015) - A team of Korean scientists have figured out how to tune black phosphorous' (BP) band gap to form a superior semiconductor. This research, published in Science, potentially allows for greater flexibility in the design and optimization of electronic and optoelectronic devices like solar panels and telecommunication lasers.

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), effectively modified BP from a semiconductor to a gapless Dirac semimetal with properties similar to graphene.

Graphene has a band gap of zero in its natural state and so acts like a conductor. Because the conductivity of graphene cannot be shut off, even at low temperatures, graphene is difficult to use as a semiconductor.

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.

“Graphene is a Dirac semimetal. It's more efficient in its natural state than black phosphorus but it's difficult to open its band gap. Therefore we tuned BP's band gap to resemble the natural state of graphene, a unique state of matter that is different from conventional semiconductors,” explained Kim Keun Su, a professor at POSTECH.

“We transferred electrons from the dopant—potassium—to the surface of the black phosphorus, which confined the electrons and allowed us to manipulate this state. Potassium produces a strong electrical field which is what we required to tune the size of the band gap,” explained Kim Keun Su, a professor at POSTECH.

The potassium doping induced a giant Stark effect, which tuned the band gap allowing the valence and conductive bands to move closer together. This effectively lowered the band gap and drastically altered it to a value between 0.0 ~ 0.6 electron Volt (eV) from its original intrinsic value of 0.35 eV.

This improved form of black phosphorus could potentially be applied to several sectors including engineering where electrical engineers can adjust the band gap and create devises with the exact behavior desired.

The article can be found at: Kim et al. (2015) Observation of Tunable Band Gap and Anisotropic Dirac Semimetal State in Black Phosphorus.
http://dx.doi.org/10.1126/science.aaa6486

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Future electronics: Black phosphorus surges ahead of graphene
Superior conductor may be mass produced for electronic and optoelectronics devices

Date:
August 13, 2015
Source:
Institute for Basic Science

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.

Keun Su Kim, an amiable professor stationed at POSTECH speaks in rapid bursts when detailing the experiment, "We transferred electrons from the dopant -- potassium -- to the surface of the black phosphorus, which confined the electrons and allowed us to manipulate this state. Potassium produces a strong electrical field which is what we required to tune the size of the band gap."

This process of transferring electrons is known as doping and induced a giant Stark effect, which tuned the band gap allowing the valence and conductive bands to move closer together, effectively lowering the band gap and drastically altering it to a value between 0.0 ~ 0.6 electron Volt (eV) from its original intrinsic value of 0.35 eV. Professor Kim explained, "Graphene is a Dirac semimetal. It's more efficient in its natural state than black phosphorus but it's difficult to open its band gap; therefore we tuned BP's band gap to resemble the natural state of graphene, a unique state of matter that is different from conventional semiconductors."

The potential for this new improved form of black phosphorus is beyond anything the Korean team hoped for, and very soon it could potentially be applied to several sectors including engineering where electrical engineers can adjust the band gap and create devises with the exact behavior desired. The 2-D revolution, it seems, has arrived and is here for the long run.

http://www.sciencedaily.com/releases/2015/08/150813142552.htm

Hey Cr6, Please don't feel like you are shouting to a deaf audience. The materials technology people continue to make advancements despite the lack of theories by the mainstream. These materials are being tailored to allow varying bias voltages and currents, along with all kinds of desirable properties to enable more reliable semi-electronic devices - using electric current. Unfortunately, I assume they must fight for their funding too. It's harder to be objective with all the claims. I bet electrons will be replaced with photons faster than the electrical industry developed. Graphene is impervious to all materials!? I really don't think so, ready the electron guns!