Solar panels are made from strings of solar cells. The solar cells are soldered together in strips by a process know as tabbing. A typical solar cell will measure 7.5 x 15cm (3x6 inches), it's ouput will be about 1/2 a volt and can generate about about 3.5Amps in full sun.
Have a look at this DIY solar panel article for more information on how to make your own DIY Panel by connecting solar cells together. A typical solar photovoltaic module has 36 cells behind a piece of toughened glass and usually mounted in an aluminium frame.