| 초록 |
Binary Sb2Se3 thin film has posed significant interests as a promising solar cell material due to its relative earth-abundance, an appropriate band gap of 1.1-1.2eV, and a high absorption coefficient around 105 cm-1 at a visible range. With a rapid increase in the efficiencies since 2014, a record power conversion efficiency of 9.2% has been reported in 2019. One of the critical drawbacks in Sb2Se3 thin films is the high vapor pressure of Sb2Se3 which can result in the decomposition of Sb2Se3 during evaporation. The density functional theory suggested that it leads to the facile formation of VSe which decreases the p-type conductivity. Therefore, we evaporated Sb2Se3 with additional Se to suppress the formation of VSe. Using vapor transport deposition technique, we fabricated highly [hk1]-orientated Sb2Se3 solar cells with improved open-circuit voltage. We also studied the device performance of Sb2Se3 solar cells in relation with their morphology and crystalline orientations. |
