They already have ways to make the panels more efficient . But the companies have to consider cost factors also . For the majority of people getting into solar . They are looking into when the panels will break even . If a the average person dont see any break even period . Most wont even consider this panel and will drop to the lower efficient panel. There are scenarios that high efficient panels are much better like consider a large solar farm . In theory if the company was purchasing the panels from them selves . The positive cost of the more efficient panel may be off set by the amount of aluminum and labor involved for assembly of panels .
Panel efficiency has been increasing through the years though . Slowly but surely .