NOVELTY - The heater apparatus (117) has one or more heater elements (204) in a rotating, in-line or vertical deposition processing system, and a front cover (206) that covers the heater elements from front side. A planar, arc or curved shaped back metal reflector (202) mates with the front cover on back side and encloses the heater elements. The heater elements are one of infrared heater elements, microwave tube heating elements, or electric resistive heating elements.    USE - Heater apparatus used in solar cell forming device for forming solar cell (all claimed).    ADVANTAGE - Minimizes excessive deposition of absorption components on the substrates by selecting the speed of rotation of rotatable substrate apparatus. Obtains lower manufacturing costs for the solar cell since sodium is directly introduced to the absorber layer. The apparatus includes isolation baffle in addition to one or more isolation sources to minimize evaporation source material contamination of one or more sputtering sources. The front cover protects the heater elements from contamination from selenium or other processing elements while still enabling sufficient thermal conductivity to heat the substrates being processed. The back metal reflector is made of planar stainless plate or of grooved reflective metal plate or of plate having other shapes that enhances the focus or thermal irradiation towards a substrate being processed. Obtains increased efficiency and accuracy for forming the absorber monolayer having predetermined composition. Provides uniform thermal irradiation by reflecting infrared light sources forming the one or more heater elements upon grooved surface of the back metal reflector or upon the shaped surface of back metal reflector constructed to focus thermal radiation towards the surface of substrate being processed.    DETAILED DESCRIPTION - The back metal reflector is made of stainless steel plate or plate having high-reflectivity metal coating made of gold, copper, or aluminum. The front cover is made of one of quartz, graphite, silicon carbide, ceramic, or any material having high thermal conductivity. An INDEPENDENT CLAIM is included for a method of forming a solar cell.    DESCRIPTION OF DRAWING(S) - The drawing shows an exploded perspective view of the heater apparatus used for forming a solar cell.    Heater apparatus (117)    Back metal reflector (202)    Heater elements (204)    Front cover (206)