Technical term used in computing and materials science to describe a non-crystalline solid state.
Amorphous silicon is used in solar cells.
結晶質 means 'crystalline', the opposite of 非結晶質.
アモルファス is a common loanword synonym for 'amorphous', often used in the same technical contexts.
Compound of 非 (hi-, 'non-') + 結晶 (kesshō, 'crystal') + 質 (shitsu, 'quality' or 'substance'), literally 'non-crystalline substance'. A modern technical term.