Abstract
Chalcopyrite CuIn0.7Ga0.3Se2 (CIGS) has shown to be as an effective absorber in high-efficiency solar cells. Here, a coating paste containing submicron CIGS powders is screen printed on a glass substrate. The printed wet film is then dried and annealed in a far infrared rapid thermal annealing (RTA) system with and without normal loading. The effects of the RTA temperature and normal loading during annealing on the quality of the CIGS films are evaluated. The carrier concentration and mobility of the film increase when the annealing temperature increases from 400°C to 600°C. A three-stage annealing process: 5min binders/solvents removal at 250°C, 7min annealing at 500°C, and 3min densification at 600°C gives a p-type chalcopyrite CIGS film with the carrier concentration in the order of 1015 cm-3 when a normal loading of 1.97N cm-2 being applied during RTA annealing. There is no carbon being detected in the as-prepared CIGS films after 600°C densification.
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