TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Method: The method of depositing selenium on a substrate further comprises: optionally, providing group 1a source comprising sodium; providing group 1b source; providing group 3a source; optionally, providing group 6a sulfur source; forming at least one group 1a-1b-3a-6a precursor material on the substrate by optionally using the group 1a source to apply sodium to the substrate, using the group 1b source to apply group 1b material to the substrate, using the group 3a source to apply group 3a material to the substrate, and optionally using the group 6a sulfur source to apply sulfur material to the substrate; and treating the precursor material to form a group 1a-1b-3a-6a material of formula (NarX1mY1nS1pSeq) (III).X1 = at least one group 1b element comprising Cu or Ag;Y1 = at least one group 3a element comprising Al, Ga or In;r = 0-0.75;m = 0.25-1.5;n = 1;p = 0-2.5;q = 0-2.5; andp+q = 1.8-2.5.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The liquid carrier is a nitrogen containing solvent, which is a liquid amine of formula (N(R3)3). The liquid carrier is ethylene diamine, diethylenetriamine, tris(2-aminoethyl)amine, triethylenetetramine, n-butylamine, n-hexylamine, octylamine, 2-ethyl-1-hexylamine, 3-amino-1-propanol, 1,3-diaminopropane, 1,2-diaminopropane, 1,2- diaminocyclohexane, pyridine, pyrrolidine, 1-methylimidazole and/or tetramethylguanidine.R3 = H, 1-10C alkyl, 6-10C aryl or 1-10C alkylamino. Preferred Definitions:    R, R1 = phenyl, methyl, ethyl, propyl, butyl, isopropyl or tert-butyl; and    Z, Z1 = S or Se.    EXAMPLE - Selenium powder (0.112 g) was added into a reaction vessel in air. Then dibutyl disulfide (0.063 g) was added into the reaction vessel, and purged with nitrogen. Then ethylene diamine (3.32 g) was added without agitation to the reaction vessel using inert techniques in a glove box. The reaction mixture was heated on hot plate set at 120 degrees C for 6.5 hours, and then raised to 130 degrees C and heated for 2 more hours to give selenium ink.