Abstract
Thin film solar cells based on CuInS 2/ buffer/ZnO have been prepared with different buffer layers of mixed ZnS-In 2S 3 composition. The buffer films are grown by chemical bath deposition (CBD) from acidic solutions of InCl 3, ZnSO 4 and thioacetamide (TA). A kinetics study of the growth of the buffer layers is carried out with the quartz crystal microbalance. The influence of bath conditions (solution, temperature and composition) on the growth rate is studied. Films are obtained with different physical, chemical and morphological properties. The absorption coefficient spectra of the films show a variation depending on the CBD conditions, with absorption edges between 2.6 and 3.35 eV. Surface morphology of the films, observed with scanning electron microscopy, reveals that the presence of Zn produces characteristic structures with microtubular form, compared with pure In 2S 3 buffer films. Solar cell results show a significant increase of Voc and FF upon introducing Zn 2+ ion in the buffer layer.
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