I just came across this, after reading this interesting questioninteresting question. The Solar Probe Plus mentioned there will have (very) actively cooled photovoltaics on special articulated mountings. It is planned to pass within nine solar radii of the sun's surface (about 4 million miles!) Yikes!
It is further described in this answerin this answer.
above: screen shot from NASA's Solar Probe Plus Fact Sheet
above: illustration of NASA's Solar Probe Plus from here. Sun is up - to state the obvious!