TiCl₄ 처리된 TiO₂ 층이 적용된 Perovskite 태양전지의 특성

Abstract

In this study, the characteristics of perovskite solar cells were studied by treating and fabricating the TiO₂ electron transport layer with TiCl₄. TiO₂ is most often used as an electron transport layer in perovskite solar cells, but has a disadvantage of deteriorating the photoacrive layer in perovskite solar cells. The concentration of the TiCl₄ solution was changed to 0 to 200 mM, and a blocking layer was formed between the photoactive layer and the electron transport layer, and the photoactive layer and the electrode were directly contacted. As a result, the TiCl₄ treatment improved key parameters such as open-circuit voltage, short-circuit current density and fill factor. In addition, it was confirmed that the electrochemical impedance value decreased during the TiCl₄ treatment. Accordingly, it increased the short-circuit current density and reduced electron recombination, and showed the highest efficiency of 15.71% in a perovskite solar cell treated with a concentration of 100 mM TiCl₄.