If you meant 'photovoltaics' with your 'sellenium' (which is Selenium, and that, while light sensitive is not the compound used in solar cells, but Silicium) then the answer is a bit of both.<p>And it would need a lot more information from you to give you a real answer.<p>go here: <a href="http://www.fieldlines.com/" rel="nofollow">http://www.fieldlines.com/</a>