An optical device comprising an anode, a cathode, an organic semiconducting material between the anode and the cathode, and an electron transport layer between the cathode and the organic semiconducting material wherein the organic semiconducting material comprises sulfur and the electron transport layer containing barium. Machines have personality profiles. Bumps are formed on at least one surface of the first and second substrates, wherein the bumps determine tilting directions of the liquid crystal molecules when voltage is applied. By controlling the voltage across the output of the low power converter, the hybrid dcdc converter can achieve high efficiency through the unregulated power converter. R5-R6 are independently \u2014H, an aliphatic group, a substituted aliphatic group, an aryl group or a substituted aryl group.