Wikipedia has a good diagram of the
solar spectrum - which is unfortunately too wide to look sensible put in-line.
As A.L. says the name "infrared" covers a confusingly wide range. Most of the infrared in sunlight is very short wavelength, only a bit longer than red light and in most ways behaves like visible light except that we can't see it. This is quite different from the much longer wavelength infrared which is given off by objects at around room temperature - often called thermal IR.
Incidentally, IR remote controls use short wavelength IR. CMOS cameras are sensitive to these wavelengths as well as visible light and have filters to remove the IR otherwise they'd get odd colour blooms. Removing the filter then adding other filters to get rid of visible light gives you an IR camera - but not to be confused with the much more expensive thermal IR cameras for the longer wavelengths. Mobile phones and cheap cameras don't tend to have very good IR filters so can see bright shortwave IR from remote controls. This can be handy for debugging: it was one of the first tests Henry used to try to see what the problem was with Jane's IR remote controlled helicopter
here.
UV is a pretty small part of the total amount of power arriving from the sun. It's only really worth noting because the individual photons have high enough energy to be biologically damaging (the shorter the wavelength the higher the energy of the photons).
Solar thermal collectors will make use of pretty much all of the available solar radiation. Depending on their design they may or may not make use of any long-wavelength thermal IR available. Ones with selective coatings are designed to absorb short wavelength radiation (UV, visible and shortwave IR) but not emit the long-wavelength thermal IR associated with their operating temperatures. Things which don't emit a given wavelength don't absorb it either so selective coatings lose out on the incoming thermal IR but gain more by not losing energy at these wavelengths.
PV needs photons which are energetic enough to kick electrons through the right quantum levels. This means they tend to use visible and UV but not much of even the short wavelength part of the IR spectrum.
