“This opens up the use of a broader range of less soluble materials and it cuts the use of the harmful solvents. Plus, the spraying process allows you to build in a charge gradient—to make a more efficient cell.”
“To print OPVs, you have to make concentrated solutions to produce a strongly absorbing but thin film. Unfortunately, many of these materials are sparingly soluble, so we use [toxic] organic solvents, like dichlorobenzene,” Gerry says, “With spray on-solar you don’t need concentrated solutions—you just spray longer with a normal solvent.
CSIRO Materials Science and Engineering, Gerry Wilson, +61 3 9545 2205
Story written for Science in Public as part of Stories of Australian Science 2012.