Electrostatic spray deposition is an innovative coating technique that produces fine, uniform, self-dispersive (due to Coulombic repulsion), and highly wettable, atomized droplets. Copper-indium salts are dissolved in an alcohol-based solvent; this precursor is then electrostatically sprayed onto a moderately heated, molybdenum-coated substrate. Precursor flowrates range from 0.02 to 5 mL/h under applied voltages of 1-18 kV, yielding droplet sizes around a few hundred nanometers. Comparing scanning electron microscope images of the coated samples showed that the substrate temperature, applied voltage, and precursor flowrate were the primary parameters controlling coating quality. Also, the most stable electrostatic spraymode that reliably produced uniform and fine droplets was the cone-jetmode with a Taylor cone issuing from the nozzle.
Bibliographical noteFunding Information:
This research was supported by the Research Center of Break-through Technology Program through the Korea Institute of Energy Technology Evaluation and Planning (KETEP) funded by the Ministry of Knowledge Economy (2009-3021010030-11-1) and by the Korea Research Council Industrial Science and Technology (B551179-08-03-00).
This work was partly supported by the Center for Inorganic Photovoltaic Materials (NRF-2011-0007182) funded by the Korean government (MEST).
ASJC Scopus subject areas
- Environmental Chemistry
- General Materials Science