Solar thermal power stations are still being built - this article, for example, reports on new power plants being built in Israel using a variety of solar power technologies:

http://www.independent.co.uk/news/world/middle-east/israel-solar-tower-power-energy-renewable-tech-ambitions-a7510901.html

I imagine there's less discussion of solar thermal power in the scientific literature compared to photovoltaics because the technology is relatively well understood. Photovoltaics also have the advantage of being much easier to use for small-scale generation in homes, small businesses etc. as well as powering small individual devices.

Photovoltaics have no moving parts and thus can operate much longer without maintenance than can solar thermal. Also the efficiency of photovoltaics now equals or exceeds that of solar thermal.

Dear sir

I think photocell technology is more simple without moving parts ..

Photovoltaics have no moving parts and thus can operate much longer without maintenance than can solar thermal

Solar PV (Photovoltaics) has today become a much simpler/cheaper technolgy, as already mentioned. BUT, there is always one:-), Solar PV output is directly linked to the sun radiation. There is no buffer nor lag. Therefore you need somewhere to store electricity produced during the day in order to manage the evening peak or even a clowd.

With Solar Thermal you are instead boiling water/steam in which energy can easily be stored and added.

Anyway the most feasible solution today is Solar PV (or Wind ofcourse) + Fossile fule. When Solar PV output drops at sunset, a gas powerplant/peaker picks up and run the last couple of hours during 4-5 hour evening peak until consumption has gone down to the level where the typical baseload (Coal, Nuclear etc) manages the night. Hydro is another exelent technology that can be turned on and of immidiately to handle peak demands. To store electricity in batteries for 4-5 hour would be extremely expensive and therefore batterises are today mainly used for smanaging horther periods of a few minutes (Clowds and frequenzy stabilisation).