Efficient TiO 2 Surface Treatment Using Cs 2CO 3 for Solution-Processed Planar-Type Sb 2S 3 Solar Cells

摘要

We report a highly effective surface treatment method for planar-type Sb~(2)S~(3)solar cells by employing a Cs~(2)CO~(3)-modified compact TiO~(2)(c-TiO~(2)) electron transport layer. It is found that surface treatment using a Cs~(2)CO~(3)solution can shift the work function of c-TiO~(2)upward and reduce its surface roughness. As a result, compared with the power conversion efficiency of untreated solar cells, that of the treated solar cells with a glass/FTO/c-TiO~(2)(/Cs~(2)CO~(3))/Sb~(2)S~(3)/P3HT/Au structure significantly improved from 2.83 to 3.97%. This study demonstrates that the introduction of Cs~(2)CO~(3)on a c-TiO~(2)layer is a simple and efficient way to adjust the work function of the electron transport layer and fabricate high-performance planar-type Sb~(2)S~(3)solar cells.