SANTA ROSA -- GT Advanced Technologies Inc. (GTAT), a U.S. supplier of manufacturing equipment for solar and energy-efficient lighting products, has announced the acquisition of Thermal Technology LLC of Santa Rosa in a deal that values the supplier of high-temperature furnaces at more than $14.7 million.

GT Advanced provided 3.4 million shares of common stock and agreed to pay an unspecified amount in the future, the Nashua, N.H.-based company said in a statement today.

Thermal Technology makes high-temperature thermal and vacuum systems that GT Advanced will use to make products including sapphire cover screens for touch-sensitive electronic devices.

In 2012, Thermal Technology reported that it had about 70 employees.