Abstract
A dual-layer fluorine-doped tin oxide (FTO) film has been fabricated by means of sequential spray pyrolysis for high-efficiency perovskite solar cells (PSCs). The H-FTO/L-FTO dual layer film consists of a H-FTO layer prepared at high deposition temperature (≈450 °C) and a L-FTO layer, fabricated at low deposition temperature (≈150 °C), which is used to replace the traditional compact TiO2 /FTO layer. The effects of F/Sn molar ratio, precursor solution concentration, and deposition temperature on the electrical, optical, surface morphological, and grain structural characteristics of H-FTO layers have been studied systematically. With an increase in precursor solution concentration, the mobility and carrier concentration of H-FTO increases; however, the grain size and sheet resistance decreases as the precursor solution concentration increases. A high deposition temperature results in a large grain size and enhanced haze value. The L-FTO layer expresses compact layer growth, inconsistent with the H-FTO surface structure, and possesses excellent electron collection and transport efficiency. The effect of the hole-blocking characteristics of L-FTO on the PSC performance is studied. This study provides a novel dual-layer FTO film to...Continue Reading
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