Abstract
In the present work, Mo–Cr bilayer back electrode is prepared and used in Cu2ZnSn(S, Se)4 (CZTSSe) solar cells, to enhance adhesion of Mo to soda lime glass (SLG) substrate and so improve power conversion efficiency (PCE) of CZTSSe solar cell. It is found that the Mo–Cr bilayer electrode has smaller resistivity and stronger adhesion to SLG than conventional Mo electrode. CZTSSe film grown on the Mo–Cr electrode has better crystal quality and closer contact with back electrode than that grown on Mo electrode. Compared to Mo electrode, Mo–Cr bilayer electrode can improve open-circuit voltage; short-circuit current density and filling factor and so PCE of CZTSSe solar cell. By optimizing process, the PCE of CZTSSe solar cell is increased from 8.4% (7.9% for total area) with Mo as electrode to 9.6% (9.0% for total area) with Mo–Cr as electrode. The increment of the PCE is mainly attributed to increase in open circuit voltage (Voc) and filling factor (FF). The increased FF and Voc are due to decrease in series resistance and reverse saturation current density induced by substitution of Mo–Cr for Mo, respectively.
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