Method for quality film formation

Details Method for quality film formation Method for quality film formation

1978-03-15

1980-09-23

Hoffman, James R.

Coating processes

Measuring, testing, or indicating

427 74, 427314, 4273722, 427424, 427 55, F24J 302, B05D 302

Patent

active

042243556

ABSTRACT:
Methods and apparatus are provided for forming films of materials which are component layers of solar energy conversion devices, e.g. photovoltaic cells and heat collector panels. A selected substrate, generally glass, is heated while being sprayed with solutions which react on the heated surface to form a particular film. Films of SnO.sub.x and CdS are particularly produced. According to the present invention, a thermal energy input gradient is provided to approximate the energy loss gradient during the spray process. Radiative heaters provide a rapid resupply of energy to the substrate and, in some instances, directly to the film forming surface. Temperature detectors, such as thermocouples, monitor substrate temperature to provide the radiative energy input needed for substantial temperature uniformity.

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