Measuring Purity, Size of Organic Solar Cells Ups Efficiency 42 Percent
January 8, 2013 3:00 PM
comment(s) - last by
By finding out how pure and large the acceptor domain is and what the interface of the donor domain looks like, efficiency can be increased
Berkeley Lab scientists have measured various aspects of an
organic solar cell
for the first time, successfully increasing efficiency with this knowledge.
The study, which was conducted by an international team of scientists at Berkeley Lab and led by Harald Ade, is the first to successfully map the size and purity of domains in organic solar cells to increase their performance.
For photovoltaic devices to compete with fossil fuels for energy collection, they must convert sunlight to energy at a very efficient level. Solar cell conversion
depends on excitons
, which are electron pairs that are energized by sunlight. These excitons must get to the interface of the donor and acceptor domains as quickly as possible to avoid losing energy as heat.
The efficiency of
polymer-based organic photovoltaic cells
depends on the purity of the donor and acceptor domains. So by finding out how pure and large the acceptor domain is and what the interface of the donor domain looks like, efficiency can be increased.
To do this, the researchers used ALS beamlines 220.127.116.11, a Resonant Soft X-ray Scattering (R-SoXS) facility; 7.3.3, a Small- and Wide-Angle X-Ray Scattering (SAXS/WAXS/) end-station, and 5.3.2, an end-station for Scanning Transmission X-Ray Microscopy (STXM) at Berkeley Lab.
"The combination of these three ALS beamlines enabled us to obtain comprehensive pictures of polymer-based organic photovoltaic film morphology from the nano- to the meso-scales," said Brian Collins, the paper's co-author. "Until now, this information has been unattainable."
Using the ALS beamlines, the team studied the polymer/fullerence blend PTB7:PC71BM in thin films made from chlorobenzene solution. It did this with and without the addition of the solvent diiodooctane, and the films were composed of droplets in where the dominant acceptor domain size without the additive was about 177 nanometers.
Adding the solvent reduced the acceptor domain size down to about 34 nanometers while maintaining the film's composition and crystallinity.
The end result was an efficiency gain of 42 percent.
This article is over a month old, voting and posting comments is disabled
1/8/2013 3:54:19 PM
If we could supplement some electricity use for heating it would be great. I would put some on my garage and charge during the day and heat at night but have a backup heat source in case of problems.
RE: Important stuff
1/10/2013 3:28:58 PM
One way to heat a home at night is to literally store it in the daytime, using a series of pipes in an underground comtainer containing glaubers salt for example. circulate the heat down in the ground, heat it up, reclaim it at night.
"Google fired a shot heard 'round the world, and now a second American company has answered the call to defend the rights of the Chinese people." -- Rep. Christopher H. Smith (R-N.J.)
Organic Crystal Allows Excitons to Travel Further, Produces More Efficient Plastic Solar Cells
October 11, 2010, 10:56 AM
Environmental Impact and Energy Use of Organic Solar Cells Evaluated
September 20, 2010, 10:24 PM
New Research Brings Organic Solar Cells Closer to Light of Day
January 16, 2009, 2:00 PM
Campbell's Monkeys Found to Use Different Dialects to Describe Local Threats
December 22, 2014, 3:52 PM
Scientist Confirm Men are More Likely to Die in "Idiotic" Ways
December 17, 2014, 1:07 PM
Shoppers Surprised to Find Cards Against Humanity's Bullsh*t is Real Feces
December 16, 2014, 11:14 PM
Air Force Worries Hot Fuel Could Harm F-35, "Proactively" Paints Trucks Shiny
December 11, 2014, 9:06 AM
McDonald's is Testing Tablet-Based Burger Customization at 30 Franchises
December 10, 2014, 11:30 AM
Detroit Pulls Together Amidst Massive Blackout
December 2, 2014, 3:57 PM
Most Popular Articles
BlackBerry Classic Sells Out Online (Seriously, It Has) for North America
December 15, 2014, 7:07 PM
Paramount Bans Team America Screenings, Cowers Submissively to North Korea
December 18, 2014, 10:26 PM
Apple Abandons Russia; Ruinous Ruble Run Sees 25% Inflation in a Single Day
December 16, 2014, 5:40 PM
News Corp's Fox is Terrified of North Korea, Kills Upcoming Steve Carell Film
December 18, 2014, 4:09 PM
Android-Powered BLU Studio 7.0 Claims to be the "World's Largest Smartphone"
December 19, 2014, 2:40 PM
Latest Blog Posts
Sceptre Airs 27", 120 Hz. 1080p Monitor/HDTV w/ 5 ms Response Time for $220
Dec 3, 2014, 10:32 PM
Costco Gives Employees Thanksgiving Off; Wal-Mart Leads "Black Thursday" Charge
Oct 29, 2014, 9:57 PM
"Bear Selfies" Fad Could Turn Deadly, Warn Nevada Wildlife Officials
Oct 28, 2014, 12:00 PM
The Surface Mini That Was Never Released Gets "Hands On" Treatment
Sep 26, 2014, 8:22 AM
ISIS Imposes Ban on Teaching Evolution in Iraq
Sep 17, 2014, 5:22 PM
More Blog Posts
Copyright 2014 DailyTech LLC. -
Terms, Conditions & Privacy Information