Without form, referring to rock or other substance lacking observable texture.

Presenting no definite form; being shapeless or formless. (2)

A non-crystalline semiconductor material that has no long-range order.

1. A thin-film, silicon photovoltaic cell having no crystalline structure.

Manufactured by depositing layers of doped silicon on a substrate.

2. An alloy of silica and hydrogen with a disordered, noncrystalline internal atomic arrangement.

It can be deposited in thin-film layers by a number of deposition methods to produce photovoltaic cells on glass, metal, or plastic substrates.

Amorphous silicon with a small amount of incorporated hydrogen.

The hydrogen neutralizes dangling bonds in the amorphous silicon, allowing charge carriers to flow more freely.