Final answer:
Amorphous silicon and amorphous selenium use short-range order in their atomic structure. Amorphous silicon is commonly used in thin-film solar cells while amorphous selenium is typically used in x-ray imaging devices.
Step-by-step explanation:
Both amorphous silicon and amorphous selenium make use of short-range order in their atomic structure that lacks a long-range periodic order which crystals usually possess. This is because they are amorphous solids. Amorphous silicon, for example, is used in thin-film solar cells because of its ability to absorb light efficiently. Amorphous selenium, on the other hand, is used in x-ray imaging devices due to its excellent photoconductive properties.
Learn more about Amorphous Solids