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Glossary a-Si

Definition of a-Si

a-Si

1.  An acronym for Amorphous silicon.Amorphous silicon is the non-crystalline allotropic form of silicon. Amorphous silicon is a long-life ceramic-type photoconductor.

More Information:
Silicon is a four-fold coordinated atom that is normally tetrahedrally bonded to four neighboring silicon atoms. In crystalline silicon this tetrahedral structure is continued over a large range, forming a well-ordered lattice (crystal). In amorphous silicon this long range order is not present and the atoms form a continuous random network.

• See also amorphous silicon
• Related terms: amorphous silicon, amrSi
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