Abstract
Among the various approaches, ZnS treatment is the most convenient method for reducing the charge recombination in quantum dot-sensitized solar cells (QDSSCs). Here an improved method of ZnS treatment is explained for efficiency enhancement in QDSSCs. To get to the goal of device performance improvement, it is essential to have a uniform deposited layer. We utilized Triton X-100 (TX-100) as a surfactant to the convenient aqueous precursors during ZnS deposition by successive ionic layer adsorption and reaction method. It helps to decrease in contact angle and increase in wettability of the aqueous precursor and results in a more uniform deposited layer. The effect of modified ZnS treatment on the charge transport properties of the cells is investigated by voltage decay measurement and impedance spectroscopy methods. Our results show that increasing recombination resistance is one of the most important roles of ZnS treatment. This study indicates that ZnS deposition from low surface tension precursors can be systematically used in QDSSCs to enhance the performance of the cells.
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