Abstract
Nowadays, deposition of solar-grade Cu2ZnSnS4 (CZTS) films by printing techniques from ink is being extensively investigated. Printing of CZTS films by doctor blading from appropriate ink is reported. CZTS ink is prepared by one-step microwave heating of a solution consisting of copper (II) acetate, zinc acetate, tin (II) chloride and thiourea dissolved in a non-toxic ethylene glycol as solvent. The as-prepared microwave-processed ink is used directly to print CZTS films on soda lime glass substrates. CZTS films are then subjected to heat treatments in inert atmosphere at different temperatures and durations. X-ray diffraction data of the films show kesterite CZTS lines of (112), (200), (220), (312) and (332). Raman spectra of the films has the characteristic peak at 336 cm−1 thus confirming the formation of pure kesterite CZTS without any ZnS or Cu2SnS3. Scanning electron microscope reveals that films consist of spherical CZTS grains of diameters about 1.5 µm. The films are p-type as determined from thermoelectric measurements.
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