Currently record for solar cell efficiency is 42% which
is larger then peak efficiency for internal combustion engine (38%).Typical solar concentrators are able to concentrate light up to 1000 times.It should give power density about 100 Kw-h per 1/4 square meter of panel.
http://en.wikipedia.org/wiki/Solar_c...aics_.28CPV.29
So will we be able to see thermovoltaic combustion cars in which light of burning body (such as gas) is converted into electricity?It could be especially good for plug-in hybrid vehicles.Contain much less parts,etc.