Nanotechnology Now

Our NanoNews Digest Sponsors


Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > Researchers improve performance of III-V nanowire solar cells on graphene: Imagine a field of small wires—standing at attention like a tiny field of wheat—gathering the Sun’s rays as the first step in solar energy conversion

A dense array of nanowires grown directly on graphene. The insets show a higher magnification SEM view of the array and a STEM image of a single, axially heterostructured InGaAs/InAs nanowire.
A dense array of nanowires grown directly on graphene. The insets show a higher magnification SEM view of the array and a STEM image of a single, axially heterostructured InGaAs/InAs nanowire.

Abstract:
Researchers at the University of Illinois at Urbana-Champaign have achieved new levels of performance for seed-free and substrate-free arrays of nanowires from class of materials called III-V (three-five) directly on graphene. These compound semiconductors hold particular promise for applications involving light, such as solar cells or lasers.

Researchers improve performance of III-V nanowire solar cells on graphene: Imagine a field of small wires—standing at attention like a tiny field of wheat—gathering the Sun’s rays as the first step in solar energy conversion

Urbana, IL | Posted on March 24th, 2014

"Over the past two decades, research in the field of semiconductor nanowires has helped to reshape our understanding of atomic-scale crystal assembly and uncover novel physical phenomena at the nanometer scale," explained Xiuling Li, a professor of electrical and computer engineering at Illinois. In the March 20th issue of Advanced Materials, the researchers present the first report of a novel solar cell architecture based on dense arrays of coaxial p-n junction InGaAs nanowires on InAs stems grown directly on graphene without any metal catalysts or lithographic patterning.

"In this work, we have overcome the surprising structure (phase segregation) and successfully grown single phase InGaAs and demonstrated very promising solar cell performance," explained postdoctoral researcher Parsian Mohseni, first author of the study.

"Depending on the materials, nanowires can be used for functional electronics and optoelectronics applications," Mohseni added. "The main benefits of this III-V photovoltaic solar cell design are that it is fairly low-cost, substrate-free, and has a built-in back side contact, while being conducive to integration within other flexible device platforms."

Li's research group uses a method called van der Waals epitaxy to grow nanowires from the bottom up on a two-dimensional sheet, in this case, graphene. Gases containing gallium, indium, and arsenic are pumped into a chamber where the graphene sheet sits, prompting the nanowires self-assemble, growing by themselves into a dense carpet of vertical wires across the graphene's surface.

In their earlier work (Nano Letters 2013) using a graphene sheet, the researchers discovered that InGaAs wires grown on graphene spontaneously segregate into an indium arsenide (InAs) core with an InGaAs shell around the outside of the wire. To improve the materials' efficiencies for solar power conversion, the researchers bypassed the unique van der Waals epitaxy induced spontaneous phase segregation by inserting InAs segments in between. The resulted ternary InGaAs NW arrays are vertical, non-tapered, controllable in size, height, and doping, and broadly tunable in composition thus energy for monolithic heterogeneous integration with 2D van der Waals sheets including graphene.

Under air mass 1.5 global solar illumination, the core-shell In0.25Ga0.75As (Eg ~ 1.1 eV) nanowire arrays on graphene demonstrate a conversion efficiency of 2.51 %, representing a new record for substrate-free, III-V NW-based solar cells.

"Although InGaAs is far from being the optimum bandgap materials for high efficiency solar cells, the direct epitaxy on graphene platform established here has significant implications for a wide variety of III-V compound semiconductor NW based solar cells on graphene, as well as light emitters and multi-junction tandem solar cells, all of which can be released for flexible applications," Li said.

In addition to Li and Mohseni, postdoctoral researcher Ashkan Behnam, and graduate students Joshua Wood, Xiang Zhao, Ning C. Wang, and Ki Jun Yu, were co-authors of the paper along with professors Angus Rockett and John A. Rogers (materials science), Joseph W. Lyding (electrical and computer engineering), and Eric Pop at Stanford University. Li also is affiliated with the Micro and Nanotechnology Laboratory, the Frederick Seitz Materials Research Laboratory, and the Beckman Institute for Advanced Science and Technology at Illinois.

####

For more information, please click here

Contacts:
Xiuling Li

217-265-6354

Writer:
Rick Kubetz
Engineering Communications Office
University of Illinois at Urbana-Champaign
217/244-7716

Copyright © University of Illinois College of Engineering

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

Scientists illuminate a hidden regulator in gene transcription: New super-resolution technique visualizes important role of short-lived enzyme clusters May 27th, 2016

Doubling down on Schrödinger's cat May 27th, 2016

Finding a new formula for concrete: Researchers look to bones and shells as blueprints for stronger, more durable concrete May 26th, 2016

Deep Space Industries and SFL selected to provide satellites for HawkEye 360’s Pathfinder mission: The privately-funded space-based global wireless signal monitoring system will be developed by Deep Space Industries and UTIAS Space Flight Laboratory May 26th, 2016

Graphene/ Graphite

Rice de-icer gains anti-icing properties: Dual-function, graphene-based material good for aircraft, extreme environments May 23rd, 2016

Graphene makes rubber more rubbery May 23rd, 2016

Graphene: Progress, not quantum leaps May 23rd, 2016

Researchers demonstrate size quantization of Dirac fermions in graphene: Characterization of high-quality material reveals important details relevant to next generation nanoelectronic devices May 20th, 2016

Chip Technology

Gigantic ultrafast spin currents: Scientists from TU Wien (Vienna) are proposing a new method for creating extremely strong spin currents. They are essential for spintronics, a technology that could replace today's electronics May 25th, 2016

Diamonds closer to becoming ideal semiconductors: Researchers find new method for doping single crystals of diamond May 25th, 2016

Dartmouth team creates new method to control quantum systems May 24th, 2016

Attosecond physics: A switch for light-wave electronics May 24th, 2016

Discoveries

Scientists illuminate a hidden regulator in gene transcription: New super-resolution technique visualizes important role of short-lived enzyme clusters May 27th, 2016

Doubling down on Schrödinger's cat May 27th, 2016

PETA science group publishes a review on pulmonary effects of nanomaterials: Archives of Toxicology publishes a review of scientific studies on fibrotic potential of nanomaterials May 26th, 2016

Harnessing solar and wind energy in one device could power the 'Internet of Things' May 26th, 2016

Announcements

Scientists illuminate a hidden regulator in gene transcription: New super-resolution technique visualizes important role of short-lived enzyme clusters May 27th, 2016

Doubling down on Schrödinger's cat May 27th, 2016

Finding a new formula for concrete: Researchers look to bones and shells as blueprints for stronger, more durable concrete May 26th, 2016

Deep Space Industries and SFL selected to provide satellites for HawkEye 360’s Pathfinder mission: The privately-funded space-based global wireless signal monitoring system will be developed by Deep Space Industries and UTIAS Space Flight Laboratory May 26th, 2016

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers

Scientists illuminate a hidden regulator in gene transcription: New super-resolution technique visualizes important role of short-lived enzyme clusters May 27th, 2016

Doubling down on Schrödinger's cat May 27th, 2016

Thermal modification of wood and a complex study of its properties by magnetic resonance May 26th, 2016

Finding a new formula for concrete: Researchers look to bones and shells as blueprints for stronger, more durable concrete May 26th, 2016

Energy

Harnessing solar and wind energy in one device could power the 'Internet of Things' May 26th, 2016

Gigantic ultrafast spin currents: Scientists from TU Wien (Vienna) are proposing a new method for creating extremely strong spin currents. They are essential for spintronics, a technology that could replace today's electronics May 25th, 2016

Light can 'heal' defects in new solar cell materials: Defects in some new electronic materials can be removed by making ions move under illumination May 24th, 2016

Technique improves the efficacy of fuel cells: Research demonstrates a new phase transition from metal to ionic conductor May 18th, 2016

Solar/Photovoltaic

Harnessing solar and wind energy in one device could power the 'Internet of Things' May 26th, 2016

Light can 'heal' defects in new solar cell materials: Defects in some new electronic materials can be removed by making ions move under illumination May 24th, 2016

This 'nanocavity' may improve ultrathin solar panels, video cameras and more May 16th, 2016

New research shows how silver could be the key to gold-standard flexible gadgets: Silver nanowires are an ideal material for current and future flexible touch-screen technologies May 13th, 2016

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







Car Brands
Buy website traffic