 Uni-Solar, a division of Energy Conversion Devices produced a version of flexible backings, used in roll-on roofing products.However, the world's largest manufacturer of amorphous silicon photovoltaics had to file for bankruptcy in 2012, as it could not compete with the rapidly declining prices of conventional solar panels.Microcrystalline silicon (also called nanocrystalline silicon) is amorphous silicon, but also contains small crystals.