Navigation Links
New ultra-clean nanowires have great potential
Date:11/10/2010

New ultra-clean nanowires produced at the Nano-Science Center, University of Copenhagen will have a central role in the development of new high-efficiency solar cells and electronics on a nanometer scale. PhD student Peter Krogstrup, Niels Bohr Institute, in collaboration with a number of well-known researchers and the company SunFlake A/S, is behind the breakthrough. The new findings have recently been published in the prestigious journal Nano Letters.

Nanowires are one-dimensional structures with unique electrical and optical properties a kind of building blocks, which researchers use to create nanoscale devices. In recent years, there has been a great deal of research into how nanowires can be used as building blocks in the development of solar cells. One of the challenges is controlling the production of nanowires. The new ultra-clean nanowires are part of the solution. Ultra clean means that the electronic structure is perfectly uniform throughout the nanowires, which is a very important part in obtaining nano-electronic devices of high performance. This is achieved by growing the wires without the use of a metal catalysis like gold, and at the same time having a perfect crystal of only one single structural phase which until now have been impossible for these types of nanowires.

- The ultra-clean wires are grown on a silicon substrate with an extremely thin layer of natural oxide. The element Gallium, which is a part of the nanowire material, reacts with the oxide and makes small holes in the oxide layer, and here the gallium collects into small droplets of a few nanometers in thickness. These droplets capture the element Arsenic the other material in the nanowire and through a self-catalytic effect starts the growth of the nanowires without interference from other substances, explains Peter Krogstrup. The breakthrough is the result of a year's work in connection with his PhD.

Control over the cultivation of nanowires

Numerous experiments with different growing conditions have made the researchers wiser to physics behind the formation of the nanowires. A nanowire normally consists of both hexagonal and cubic crystal segments, but the new nanowires only consist of a perfect cubic crystal structure. This means that the path of the electrons through the wire is unaffected and thus suffers less energy loss which leads to a higher efficiency.

- This better understanding of the growing process gives us control over the cultivation of nanowires and the clean wires are the starting point for my current work developing a high efficiency solar cell based on nanowires. With these results we are a good step closer to this goal, explains Peter Krogstrup, pointing out that his nanowires are grown on a silicon substrate.

- The substrate is cheaper than the alternative substrates that many other researchers use. It is important because ultimately it is about getting as much energy as possible for as little cost as possible, explains Peter Krogstrup, whose research is conducted in collaboration with the company SunFlake A/S, which is located at the Nano-Science Center at the University of Copenhagen. The company is working to develop the solar cells of the future based on the nanostructures of Gallium and Arsenic.

- We are very pleased that Peter has delivered such good results so early in the research project, says the CEO of SunFlake A/S Morten Schaldemose.


'/>"/>

Contact: Peter Krogstrup
pkrogstrup@gmail.com
452-671-5191
University of Copenhagen
Source:Eurekalert

Related biology technology :

1. Strong elasticity size effects in ZnO nanowires
2. Researchers peer into nanowires to measure dopant properties
3. Self-assembled nanowires could make chips smaller and faster
4. Evidence of macroscopic quantum tunneling detected in nanowires
5. New silicon-germanium nanowires could lead to smaller, more powerful electronic devices
6. Harvard scientists bend nanowires into 2-D and 3-D structures
7. Penn study: Transforming nanowires into nano-tools using cation exchange reactions
8. Understanding mechanical properties of silicon nanowires paves way for nanodevices
9. Dip ordinary paper into ink infused with nanotubes and nanowires to create an instant battery
10. Nanowires key to future transistors, electronics
11. Trapping sunlight with silicon nanowires
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:5/24/2017)... WASHINGTON, DC, USA (PRWEB) , ... May 23, 2017 , ... ... the economy as well as an enabler of life-saving medical and other vital technologies ... and photonics . They joined others in the scientific community today in responding to ...
(Date:5/23/2017)... ... May 23, 2017 , ... ... unlimited source of human cardiovascular cells for research and the development of ... it possible to generate large numbers of cardiomyocytes (hPSC-CMs). Due to varying ...
(Date:5/23/2017)... ... May 23, 2017 , ... Energetiq Technology, a ... a facility expansion to accommodate its rapid growth. , The renovations at the ... renovation of the existing areas. The expansion includes, a state-of-the-art engineering facility, and ...
(Date:5/22/2017)... ... ... Stratevi, a boutique firm that partners with healthcare companies to creatively develop and ... downtown Boston at 745 Atlantic Ave. , “We are seeing that even the ... value they provide, not just to patients, but also payers. Having a presence in ...
Breaking Biology Technology:
(Date:4/5/2017)... 5, 2017 Today HYPR Corp. , ... server component of the HYPR platform is officially ... end-to-end security architecture that empowers biometric authentication across Fortune ... already secured over 15 million users across the financial ... connected home product suites and physical access represent a ...
(Date:4/4/2017)... , April 4, 2017   EyeLock LLC , ... that the United States Patent and Trademark Office (USPTO) ... covers the linking of an iris image with a ... and represents the company,s 45 th issued patent. ... is very timely given the multi-modal biometric capabilities that ...
(Date:3/30/2017)... March 30, 2017  On April 6-7, 2017, Sequencing.com ... Genome hackathon at Microsoft,s headquarters in ... will focus on developing health and wellness apps that ... Hack the Genome is the first hackathon for ... world,s largest companies in the genomics, tech and health ...
Breaking Biology News(10 mins):