I would like to suggest to read the paper entitled "Review and Comparison of Different Solar Energy Technologies"  www.geni.org/globalenergy/research/review-and-comparison-of-so....

Thanks, I will do.

The efficiency of lab-quality a-Si is stuck at 14%, whereas all c-Si types reach more than 20% -- see the following NREL graphics displaying all research-cell record conversion efficiencies since 1976:

https://en.wikipedia.org/wiki/Solar_cell_efficiency#Comparison

To me this means that commmercially, a-Si has no chance anymore.

Hi. You can check the following file published in PROGRESS IN PHOTOVOLTAICS. DOI: 10.1002/pip.2637

Thanks, Eberto Porto

Thanks Jan-Martin Wagner

Article Comparison between Amorphous and Tandem Silicon Solar Cells ...

http://www.electronicdesign.com/power-sources/what-s-difference-between-thin-film-and-crystalline-silicon-solar-panels

Thanks Hamit Can