Researchers Mimic Evolution to Boost Solar Cell Efficiency
January 28, 2013 12:00 PM
comment(s) - last by
Genetic algorithm discovered unusual pattern was best at trapping light
A common problem in the design of
thin film solar cells
is how to develop optical materials and nanopatterns for those materials. The ultimate goal is to trap and capture as much solar energy as possible. The problem is far too challenging for naive searches based solely on human creativity. Thus artificial intelligence is increasingly being employed to search for the optimal cell materials and nanopatterns.
Professor Wei Chen
and her graduate student Cheng Sun have published a new paper on how
-- an artificial intelligence technique based on evolutionary biology -- can be used to develop high performance nano-patterns.
Much like evolution and genetic processes serve in the real world serve to select creatures giving rise to fit species
, genetic algorithms weed out bad candidates, while preserving and mixing elements of the fittest performers.
Starting with dozens of random designs, Prof. Chen's team "bred" the nanopatterns through 20 generations, employing genetic algorithm techniques like mutation and crossover.
The result was a strike nanopattern that outperformed other designs.
The "fittest" pattern [Image Source: Northwestern University]
The optimized 100-nanometer-thick organic dielectric "scattering layer" appears superb in simulations at trapping photons and transmitting them into the active layer. In fact, the simulation results predict that the layer will surpass three-fold the Yablonovitch Limit; a thermodynamic limit developed in the 1980s that statistically describes how long a photon can be trapped in a semiconductor.
Current organic solar cells
have traditional been, in a word, bad. While relatively cheap to produce compared to their rare-metal thin film counterparts, their low efficiencies make them a disappointing dead end. But the new design is intriguing as it may boost organic thin film cells into a regime in which they would actually be cost effective -- perhaps more so than rare-metal designs.
Comments Prof. Chen, "Due to the highly nonlinear and irregular behavior of the system, you must use an intelligent approach to find the optimal solution. Our approach is based on the biologically evolutionary process of survival of the fittest."
Northwestern Univ. is currently working with
Argonne National Laboratory
to produce a prototype of the nanopatterned cell, for real world testing.
In the mean time, the work has been
in the peer-reviewed journal
This article is over a month old, voting and posting comments is disabled
1/29/2013 4:48:12 PM
gravity is just a theory (an incorrect one at that) - doesnt mean that things don't fall down if you drop them.
general relativity has superseded newtons theory of universal gravitation. we are picking holes in relativity (it doesnt make sense at a sub atomic scale) and eventually it will be superseded by a theory which describes reality even closer.
at no point however will an apple stop falling to the ground if you let it go.
this is exactly analogous to evolution. the theory may not be totally right. it is however much MORE right than what some middle eastern blokes randomly thought was a good idea 4000 years ago.
we may/will come to find a more accurate theory of how life developed on earth - it isn't however going to include noah's ark - that would be akin to dropping an apple and have it hover in mid air miraculously.
"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.)
Measuring Purity, Size of Organic Solar Cells Ups Efficiency 42 Percent
January 8, 2013, 3:00 PM
Study: Human Evolution Forced by Chaotic Landscape
December 27, 2012, 1:45 PM
"Superbugs" with Up to 50 Percent Drug Resistance Invade Europe
November 18, 2011, 8:54 AM
Flexible Film Solar Cells Approach Efficiency of Hard Silicon Panels
May 23, 2011, 8:15 PM
Scientist Creates Evolutionary Robots
January 21, 2011, 11:01 AM
Creationists are Mad About Google Doodle Depicting Evolution
November 24, 2015, 8:48 PM
DHS and TSA: Whoops, We Missed That 73 Airport Employees May be Terrorists
November 19, 2015, 2:16 PM
Star Wars Spinoff Film "Rogue One", Theme Park Attractions Announced
August 17, 2015, 12:20 PM
SpaceX Falcon 9's Seventh Supply Mission to ISS Ends w/ Fiery Stage 1 Explosion
June 28, 2015, 1:10 PM
Cool Science Video: Glowing Millipede Prowls the Nevada Desert
May 18, 2015, 12:00 PM
Newly Discovered Costa Rican Glass Frog is Kermit's Doppelgänger
April 22, 2015, 11:26 AM
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 2016 DailyTech LLC. -
Terms, Conditions & Privacy Information