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Solar cell degradation observed directly for the first time
X-ray examination shows structural changes in "plastics" solar cells

Hamburg, 9 December 2013. With the help of DESY’s X-ray light source PETRA III, researchers of Technische Universität München have, for the first time, watched organic solar cells degrade in real time. This work could open new approaches to increasing the stability of this highly promising type of solar cell. The team headed by Prof. Peter Müller-Buschbaum from the Technische Universität München (Technical University of Munich) present their observations in this week's issue of the scientific journal Advanced Materials (Nr. 46, 10 December).

Organic solar cells, especially those based on polymers are inexpensive to produce on a large scale. Thanks to their physical flexibility, they can open up new applications of photovoltaics not possible today. Moreover, they can convert light into electricity at an efficiency of more than ten per cent and could contribute significantly to a large-scale power supply based on renewable sources. However, the efficiency of organic cells still rapidly declines and they have a shorter service life than conventional silicon cells.

At the P03 measuring station of DESY’s light source PETRA III, scientists have made the first live observations of the degradation of organic solar cells in operation. To do this, they lit a sample polymer solar cell using a solar simulator, which emits light that matches the spectrum and intensity of sunlight and recorded the electrical characteristics of the cell over time. At intervals ranging from several minutes to as much as one hour, the researchers also looked inside the solar cell using the sharply focused X-ray beam from PETRA III. In this way they were able to watch how the interior structure of the active layer of the solar cell changed in the course of seven hours, while the efficiency of the cell decreased by around 25 per cent.

http://www.desy.de/information__serv...index_eng.html

Crowdfunding project makes you a solar investor for $25
A.K. Streeter
Energy / Renewable Energy
December 9, 2013

In the last few years peer to peer lending and crowdfunding have blossomed. While it's great to crowdfund the latest cool product that lets you cut down on using plastic or turns your regular bike into e-bike, it's infinitely cooler to crowdfund the shift to renewable energy.

Mosaic calls itself an online marketplace for solar. Basically the company provides debt financing to solar projects and lets individual and institutional investors buy shares in a project until it is funded. When projects are complete, the company sells power to a solar customer via a long-term contract, and shares returns of approximately 4.4 - 6.36% with its investors. Investment capital is paid back along with the interest over a 5 - 10 year period.

Now Mosaic wants to take that concept to larger number of potential investors with a new incentive - the company will give new investors $25 once they make their first investment (minimum investments are $25).

Once a new user sets up a Mosaic account and finds a qualified project to invest in, Mosaic will add $25 to the amount invested.

http://www.treehugger.com/renewable-...vestor-25.html