【英语时差8,16】利用太阳能-下（在线收听）

 PV solar technology is more complex. When sunlight hits a PV cell, electrons in the cell are knocked out of their orbits. Electric fields channel the electrons in a current used to generate electricity。 Unlike thermal solar panels, PV technology isn’t very efficient. A typical solar panel converts only around twenty percent of the sunlight it absorbs into electricity. The most advanced panels may be close to forty percent efficient. So PV solar technology has a ways to go. But scientists are working hard to improve solar cells, using nanotechnology and other advanced technologies to make PV panels more powerful. Solar technology may never become efficient enough to power the entire world on its own. But it will no doubt play an important role in our energy future.