Subscribe to our free daily newsletters
  Solar Energy News  




Subscribe to our free daily newsletters



SOLAR DAILY
A new technique opens up advanced solar cells
by Staff Writers
Lausanne, Switzerland (SPX) Sep 06, 2016


File image.

In a photovoltaic cell, light generates opposite charges in the active layer. The charges must then be separated as quickly as possible to keep them from recombining. Positive charges are driven by a built-in electric field to one metallic contact, while negative charges migrate in the opposite direction to another electrode.

Using a unique ultra-fast spectroscopic technique, EPFL scientists have now been able to track the fate of charged pairs in an advanced type of solar cells currently under intense research. The work is published in Nature Communications.

Natalie Banerji at Jaques Moser's lab at EPFL used ultrafast time-resolved electroabsorption spectroscopy (TREAS) to follow the fate of charge pairs photogenerated in polymer:fullerene blends used in plastic solar cells.

TREAS has been developed in Moser's lab during the last three years. It allows real-time measurements of the separation distance of charges generated by light in the active layer of a photovoltaic solar cell.

The technique relies on the optical probing of the effective electric field experienced by a material. An external field is applied to the device and affects the absorption spectrum of materials that make up its photoactive layer. The effect is known as "electroabsorption" or the "Stark effect".

An ultrashort laser pulse then generates charges. These begin to separate, inducing a counter electrical field that opposes the externally applied one. As a result, a decrease of the amplitude of the electroabsorption signal can be detected in real time with pico- to femto-second resolution.

The data from the study create a better understanding of the mechanisms of light-induced charge separation in this type of photovoltaics, as well as of the effect of the morphology of the polymer:fullerene blend, which is necessary for designing more efficient solar energy converters.

Martina Causa', Jelissa De Jonghe-Risseb, Mariateresa Scarongella, Jan C. Brauer, Ester Buchaca-Domingo, Martin Heeney, Jacques-E. Moser, Natalie Stingelin, Natalie Banerji. The Fate of Charge Pairs in Polymer:Fullerene Blends with Controlled Phase-Morphology. Nature Communications 02 September 2016. DOI: 10.1038/NCOMMS12556.


Thanks for being here;
We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain.

With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords.

Our news coverage takes time and effort to publish 365 days a year.

If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.

SpaceDaily Contributor
$5 Billed Once


credit card or paypal
SpaceDaily Monthly Supporter
$5 Billed Monthly


paypal only

.


Related Links
Ecole Polytechnique Federale de Lausanne
All About Solar Energy at SolarDaily.com






Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle

Previous Report
SOLAR DAILY
Canada talks up low-carbon ties with China
Shanghai (UPI) Sep 2, 2016
Bilateral exchange across the Pacific in the area of clean energy could be a driver for a new global economic strategy, Canada's prime minister said. Canadian Prime Minister Justin Trudeau addressed the Canada-China Business Council during his state visit to Shanghai. With an eye on climate change, the prime minister said, in sweeping terms, that both sides could show collaborative lead ... read more


SOLAR DAILY
Croatian Pig Farm Uses Synergies to Generate Energy

Biofuels not as 'green' as many think

Biofuels could increase rather than decrease C02 emissions

Scientists solve puzzle of converting gaseous carbon dioxide to fuel

SOLAR DAILY
Researchers unveil ciliated microbots

Laundry-folding washing machine: eye-catching gizmos at IFA fair

The evolution and future of automation

Where does AlphaGo go

SOLAR DAILY
Annual wind report confirms tech advancements, improved performance, and low energy prices

OX2 wins EPC contract for 112 MW wind power in Norway

Wind power fiercer than expected

E.ON starts new wind farm in Texas

SOLAR DAILY
Germany accuses Fiat of car emissions cheating

Could A Lithium Shortage De-Rail The Electric Car Boom

Dubai debuts driverless minibus

EU urges Volkswagen crackdown after 'dieselgate'

SOLAR DAILY
Fusion facilities at PPPL and Culham, England, could provide path to limitless energy

Flywheel technology could create new savings for light rail transit

Extending battery life for mobile devices

New class of fuel cells offer increased flexibility, lower cost

SOLAR DAILY
Rosneft and Gazprom Discuss New Joint Projects With Japanese Companies

May defends delays on China-backed nuclear project

EDF board members sue to overturn Hinkley Point plan

Philippines eyes reviving mothballed nuclear plant

SOLAR DAILY
Chinese giant to buy Pakistani power company for $1.6 bn

Economy of energy-hungry India may face headwinds

Summer spells cold showers for Russians as hot water cut

Foreigners barred from buying Australia's largest energy grid

SOLAR DAILY
Modelling water uptake in wood opens up new design framework

Europe's oldest known living inhabitant

Logged rainforests can be an 'ark' for mammals, extensive study shows

Logged forests are havens for endangered species in Southeast Asia




Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News






The content herein, unless otherwise known to be public domain, are Copyright 1995-2017 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. All articles labeled "by Staff Writers" include reports supplied to Space Media Network by industry news wires, PR agencies, corporate press officers and the like. Such articles are individually curated and edited by Space Media Network staff on the basis of the report's information value to our industry and professional readership. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement