Assertion: solar cell's efficiency | /r/CapableOf | increase at their first usage
Facets:
value: to over 25%
type: OTHER
value: in 2019
type: TEMPORAL
value: in 2009
type: TEMPORAL
Source sentences:
text: Efficiencies have increased from below 5% at their first usage in 2009 to over 25% in 2019, making them a very rapidly advancing technology and a hot topic in the solar cell field.