Evaporative system for solar cell fabrication

A plurality of chamber are arranged about a transport chamber. The linear transport chamber may include a linear track supporting robot arms. The robot arms transport substrates to and from the chambers. Each chamber includes a plurality of evaporators, each controlled independently. Each substrate positioned in the chamber is coated from a plurality of the evaporators, such that by controlling the operation of each evaporator independently the formation of the layers and the concentration gradient of each layer can be precisely controlled.