Amorphous silicon technology uses the same silicon as the common crystalline silicon panels seen on many domestic roofs.
The main difference is its molecular structure, which contains less silicon, and an irregular (amorphous) make-up.
Raw amorphous silicon is deposited as a thin, naturally translucent layer on a conductive glass substrate.
The aSi-PV solar panels are manufactured by vacuum depositing an ultra-thin film of the PV absorber on a conductive TCO glass surface then laminating another glass sheet on top.
The internal structure is shown in figure 1 below.