Silver Migration in Older Solar Cells

I was up on the Ypsi Food Coop’s roof the other day and notice the color on the original solar panels from 2005 (top) were slightly darker then the solar panels from 2009 (bottom).


I don’t think is changes the power output, but it looked interesting. The darker color might make the panel absorb more thermal energy and make the panel warmer increasing the resistance, but it’s a small percentage of the total area and the effect should be marginal. Not sure what is causing the backing material to become darker, but my guess would be that it’s caused by the UV radiation from the sun.

Looking closer at some of the cells I was surprised to see some silver migration. Silver migration is a not well understood metallurgical phenomenon where the atoms of silver (in the printed wires on the cell), under mechanical and/or thermal stress, migrate and grow on the surface of a device. You can read the details from the Wikipedia page on whisking(metallurgy)

Here is an up close picture of the cell where you can see the silver has migrated from the vertical printed wire (you can see a valley down the center) and grows between the finer horizontal wires covering up some of the silicon surface.


Again, I think the effect will be marginal since the amount of silicon covered up is very small compared to the area of the total panel. Also the additional silver on the surface of the silicon should help collect more electrons some might have some small positive effect on the efficiency of the panel. If we ever replace these solar panels (+22 years from now?) I’ll have to remember to take this panel apart and measure the output from these cells with silver migration.

Here is another picture of the silver migration.

Here is a picture of the whole cell with silver migration in case someone wants to try and measure the loss of area from the silver growth.

Here is a picture of a cell with out silver migration.

14 thoughts on “Silver Migration in Older Solar Cells”

  1. Thanks on your marvelous posting! I definitely enjoyed reading it, you might be a great author.
    I will make sure to bookmark your blog and will come back from now on. I want to encourage one to continue your great job, have a nice
    holiday weekend!

  2. The webpage is the great put to showcase novel crop, innovative ideas, ready to lend a hand army, and so forth. Today, in attendance are probably billions of webpage on the Internet from about the world. The two nearly everyone efficient conduct to get public to access and seem next to one’s webpage are through ads and search engines. Just like insertion ads on Television, newspapers, billboards, etc., citizens can use currency to place ads of their webpage on accepted WebPages visited often by the others. The ads will live in hyperlink which when it is clicked, will routinely straight the web browser to the ads’ website and display the webpage.
    Using the investigate engine to through public to your webpage is gratis other than requires a modest attempt resting on your part. There are three admired hunt engines (Bing, Google, and Yahoo) that the wide-ranging community uses to appear meant for information. Search engine employs gigantic processor possessions to search billions of WebPages on the Internet to get the information that people query. Basically, the explore is conducted in the subsequent sequences:
    1) A uncomplicated software routine called spiderbot is sent absent to the Internet to crawl the webpage sites stored in the search engine’s Doman Name Database (DNdb). To accelerate the crawling, quite a lot of spiderbots may exist worn on the equal time.
    2) The spiderbot next extracts the keywords in the webpage’s HTML source regulations. It updates the DNdb with the keywords connected with the webpage.
    3) The spiderbot next goes to the next webpage site in the DNdb. The process could receive quite a lot of days to complete every one the webpage sites in the DNdb.
    4) Steps 1) to 3) are recurring resting on a regular base to create in no doubt that all the WebPages in the DNdb contain their newest keywords.
    So, in arrange to have your webpage to live searched, you necessitate to register it with the search engine to subsist incorporated in its DNdb. Click on the hyperlink underneath to locate not in how.
    As you type your query in the search engine’s webpage, it extracts the keywords in the query and starts a explore in its DMdb. If added than one game is originate, every linked webpage information will exist displayed in the orders according to the webpage’s happy and relevance.

  3. Thanks so much for giving everyone such a brilliant chance to discover important secrets from this web site. It really is very superb and jam-packed with a lot of fun for me and my office mates to visit your site at the very least three times in one week to study the new tips you will have. And of course, we’re usually fulfilled considering the perfect strategies you serve. Certain two facts in this posting are undeniably the most beneficial I’ve had.

  4. Your style is very unique compared to other folks I have read stuff from. I appreciate you for posting when you have the opportunity, Guess I will just book mark this web site.

  5. Great web site. Lots of helpful information here. I
    am sending it to some pals ans also sharing in delicious.
    And obviously, thanks in your sweat!

  6. Jordan, Kate Mara, and Jamie Bell) with the X-Men may be the best way to salvage that franchise’ and keep its rights away from Marvel Studios.
    You can add crippling challenge to this power which is a
    nice advantage (it lowers an opponent’s block and keeps it down for 10 seconds – more
    information about this advantage later). Additional advantages includes Accelerated Metabolism and Blade Beyond the Veil, which
    dishes out extra damage to any melee attackers attacking you while the skill is sustained.

  7. Excellent web site you have got here.. It’s difficult to find excellent writing like yours these days.
    I truly appreciate people like you! Take care!!

  8. I do like the way you have framed this particular situation plus it really does supply us some fodder for thought. However, from what I have witnessed, I just simply wish when the actual feedback pack on that folks continue to be on point and not start upon a soap box associated with the news of the day. All the same, thank you for this excellent piece and even though I do not necessarily go along with it in totality, I regard the standpoint.

  9. Good day very cool site!! Guy .. Excellent ..
    Amazing .. I will bookmark your website and take the feeds additionally?
    I am glad to seek out numerous helpful information here in the post, we’d like work out more techniques on this regard, thank you for sharing.

    . . . . .

Leave a Reply

Your email address will not be published. Required fields are marked *