Influence of N ‐Butyldithiocarbamic Acid Content on the Properties of Sb 2 S 3 Sensitized TiO 2 Nanorod Arrays and Photovoltaic Performance of the Corresponding Solar Cells

In this paper, Sb 2 S 3 ‐sensitized TiO 2 nanorod arrays are successfully prepared by the spin‐coated and then pyrolysis (denoted as spin‐pyrolysis) of Sb 2 S 3 precursor solution in N ‐Butyldithiocarbamic acid‐ethanol (Sb‐BDCA complex solution). The influence of precursor solution content with different mole ratios of N ‐Butyldithiocarbamic acid to Sb 3+ (6, 8 and 10, denoted as BDCA‐6, BDCA‐8 and BDCA‐10, respectively) on the crystalline phase, optical absorption and microstructure of the Sb 2 S 3 ‐sensitized TiO 2 nanorod arrays have been investigated systematically. By adjusting the BDCA to Sb 3+ mole ratios, the superior preferred orientation of the (211) plane for Sb 2 S 3 was obtained. The results revealed that the Sb 2 S 3 ‐sensitized TiO 2 nanorod arrays for BDCA‐8 showed the best conductivity and the corresponding solar cell achieved the best PCE of 5.43 % with the open‐circuit voltage ( V oc ) of 0.53 V, short‐circuit photocurrent density ( J sc ) of 17.19 mA cm −2 and fill factor (FF) of 59.21 %. After the Sb 2 S 3 sensitized TiO 2 nanorod array was modified by lauric acid, the PCE of the corresponding solar cells increased from 5.43 % to 5.77 %.