The present invention relates to a flame-retarded styrene-based plastic composition comprising a styrene-based plastic material a brominated aromatic compound having a melting point from 200\xb0 C. A number of processing servers are coupled to communicate with a number of outbound resources and a database server over an internal packet-switched data network. The printed circuit board is operable to receive operating power from the one or more batteries andor provide operating power to one or more external devices. The use of such ink avoids the need to expose the material to an H2Se gas during the construction of a photovoltaic cell and allows more uniform melting during film annealing, more uniform intermixing of nanoparticles, and allows higher quality absorber films to be formed. The invention also relates to a device for implementing this method and to a method for supplying an engine with an oxidant.