The Solar Cell That Turns 1 Photon into 2 Electrons

Solar cells are picky. If an incoming photon has too little energy, the cell won’t absorb it. If a photon has too much, the excess is wasted as heat. No matter what, a silicon solar cell can never generate more than one electron from a single photon. Such harsh quantum realities severely limit the conversion efficiency of photovoltaic cells, and scientists have spent decades looking for work-arounds. Now, researchers at the Massachusetts Institute of Technology’s Center for Excitonics have published a compelling case that the key to greater solar efficiency might be an organic dye called pentacene. In today’s issue of Science Daniel Congreve, Jiye Lee, Nicholas Thompson, Marc Baldo and six others show that a photovoltaic cell based on pentacene can generate two electrons from a single photon—more electricity from the same amount of sun. Scientists have suspected for some time that this might work; today’s paper is proof of concept. The key is a phenomenon called singlet-exciton fission, in which an arriving photon generates two “excitons” (excited states) that can be made to yield two electrons. Previous researchers had accomplished similar tricks using quantum dots (tiny pieces of matter that behave like atoms) and deep-ultraviolet light. “What we showed here,” Baldo says, in addition to using visible light, “is that [this process] works very, very effectively in organic materials.”  Full Article:

"FROM TRASH TO TREASURE: CONVERTING THE HIDDEN VALUE IN CROP WASTE TO BIOBASED FUELS AND CONVEYING A POSITIVE MESSAGE TO INVESTORS"

GREEN POWER CONFERENCES UNITES THE LEADING INTERNATIONAL PLAYERS UNDER ONE ROOF TO DISCUSS THE MATURING NEXT GENERATION BIOFUELS, BIOBASED CHEMICALS AND PRODUCTS MARKETS

GstarCAD Showcased in NY Times Square

GstarCAD showcased in NY Times Square, the innovative CAD platform of Gstarsoft – GstarCAD8 was displayed on the huge screen. This is the first time that Chinese CAD Company showcased in NY Times Square.

f-cell, BATTERY+STORAGE and the e-mobil BW TECHNOLOGY DAY 2013 united in the WORLD OF ENERGY SOLUTIONS

In the autumn of 2012, the trade fair and conference alliance comprising f-cell, BATTERY+STORAGE and the e-mobil BW TECHNOLOGY DAY attracted well over 3,000 international guests. The focus in 2013 will be on growth and continued international expansion.

Iowa Biodiesel Board praises legislature for renewable energy resolution

The resolution urges the U.S. government to move the U.S. towards greater energy independence and security.

IID receives industry recognition for solar energy adoption

"IID is proud to receive this recognition as a utility leader in the renewable energy industry"

Prevailing trends, latest technologies and international markets at Intersolar Europe 2013

From the Innovation Exchange and topical special exhibits to the Intersolar AWARD ceremony and exhibition workshops – Intersolar Europe 2013's extensive accompanying program has a lot to offer

PV Inverter Revenue Expands to $7 Billion in 2012, as Asia Arises as Growth Driver

Growth was driven by a strong increase in sales in Asia in the fourth quarter

SolarWorld will supply solar panels for world's premier pump-maker, Grundfos

Danish pump-maker taps SolarWorld solar panels to power Grundfos' trail-blazing solar-powered submersible water pumps on many continents

BIJ, finergia and meeco form Joint Venture for Japanese market

oursun Japan Holding AG to focus on clusters of small and efficient solar PV applications

Germany's E.ON power finds the "Holy Grail" of energy storage in Ontario, Canada

One of the world's largest investor-owned power utility, E.ON of Germany, selected Ontario, Canada's Mississauga-based Hydrogenics Corporation to build, install and service a Power-to-Gas demonstrator.

SMA America Joins GRID Alternatives to Bring Solar to Low-income Homes

SMA Volunteer Crew to Help Install Solar PV System at Home in Northern California

Will greenhouse gas be the most promising feedstock in coming years?

Mark Herrema, Chief Executive Officer and Co-Founder of Newlight Technologies, discusses Newlight Technolgies' operation of the largest greenhouse gas to plastic production facility in the world.

PVinsights: Polysilicon prices dropped sharply in 2H April 2013.

There is more polysilicon alternative supply for Chinese poly buyers, since solar players expect no retrospect to the levy of the anti-dumping tariffs on the polysilicon imported from the US, EU and Korea.

Awareness increasing for concentrated photovoltaics in the Middle East

The challenges of realising CPV technology in the Middle East will be discussed at length at this year's Middle East and North Africa Solar Conference (MENASOL), taking place 14-15 May in Dubai.

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