The internal structure is quite different. Amorphous silicon does not have a regularly arranged atomic structure like crystalline silicon, and its atomic arrangement is disordered. In applications like solar cells, what we need is the ordered structure of crystalline silicon to efficiently conduct electricity and generate current. The disorder of amorphous silicon causes its electron movement path to become complicated and inefficient, so it is not suitable for use as a silicon wafer that requires high-efficiency conduction.

To put it simply, the material characteristics of amorphous silicon determine that it is not an ideal choice for manufacturing silicon wafers.