At the early 1990s using  costly  production  processes,  research  laboratories  have  for  many  years  been able  to  produce  highly  efficient  crystalline  silicon  cells  with  efficiencies  up  to  nearly  25 per  cent.  In  these  the  electrical  and  optical  losses  are  minimized.  The source  material  required  here  is  a  highly  pure  polycrystalline  silicon  rod  with  a  mono-crystalline  silicon  seed  at  its  tip  -  but  this  material  is  expensive! Well the third generation technologies aim to enhance poor electrical performance of second generation (thin-film technologies) while maintaining very low production costs. Current research is targeting conversion efficiencies of 30-60% while retaining low cost materials and manufacturing techniques. They can exceed the theoretical solar conversion efficiency limit for a single energy threshold material, that was calculated in 1961 by Shockley and Queisser as 31% under 1 sun illumination and 40.8% under maximal concentration of sunlight (46,200 suns, which makes the latter limit more difficult to approach than the former). Technologies includes: Silicon nanostructures, Up/Down converters, Hot-carrier cells, Thermoelectric cells. Our purpose is not to research those technologies yet since they are not common and not affordable of course. We need to find the cell that makes sense  business wise.

So far: You should realise that the near future technology will be Thin Film. For now we stick with the Mono and Poly-Crystalline technology since the researches оn Thin -film technology are still in progress. If we need to act as  business we have to realise that investing in thin-film will be riskier but the return of the investment would be near 20-40% faster (these statements are absolutely our opinion) . The problem is that we do not know if they will be able to produce same energy for the next 20 years as the manufacturer says since the technology is still new and there is no prove of that…Most conservative investors will  go with Crystaline technology which is more efficient and is used for decades, although it is more expensive.