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Photovoltaic panels use the sun's photons to make electrons hop around, producing electrical current, while solar thermal uses photons to move whole molecules--that is, to produce heat.
FORBES: Magazine Article
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Mr. JOHN GRAHAM (Smithsonian Air and Space Museum): And we're on a very tight time line, and the reason for that is we need to get to the base of the next hill to the south, which has got north-facing slopes, so that we can get up and basically repeat what we did last winter on Husband Hill: turn the solar panels towards the sun and survive.
NPR: Mars Rover Marks Second Anniversary of Landing
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When a tracker is added so that the panels can follow the sun, the electron output increases by 30%.
FORBES: U.S. Army Dedicates World's Largest Low-Concentration PV Facility