photovoltaics
Concise Oxford English Dictionary © 2008 Oxford University Press:
photovoltaics/fəʊtə(ʊ)vɒlˈteɪɪks/
▶plural noun [treated as sing.] the branch of technology concerned with the production of electric current at the junction of two substances.
■ [treated as pl.] devices having such a junction.
'photovoltaics' also found in these Oxford entries:

