The developmental history of TCOs spans several decades. Cadmium oxide (CdO), the first recorded TCO, was introduced by Karl Bädeker in 1907. It was found that low resistivities of 1.20 × 10 -3 Ωcm and a large mobility of over 100 cm 2 V -1 s -1 at a high carrier concentration of 1 × 10 21 cm -3 can be achieved in CdO. Meanwhile, the Moss-Burstein shift leads to a wide optical bandgap, enabling its high level of transparency. Despite the toxic nature of CdO, this discovery laid the foundation and opened up the research area for improved TCOs. Since then, a number of n-type TCOs have been established, including In 2 O 3 , Ga 2 O 3 , SnO 2 and ZnO. Among these metal oxides, In 2 O 3 is the most popular transparent conductor, widely used in cutting-edge technology due to its high conductivity and over 90% transparency. However, the high cost due to the scarcity of indium raises concerns about its long-term sustainability in large-scale applications. The development of new promising TCOs is therefore driven by the demand for cost efficiency, broader application scope and enhanced performance. A recurring characteristic observed among these successful n-type TCOs is the presence of post-transition metal cations with an electronic configuration of (n-1)d 10 ns 0 np 0 . A wide bandgap with highly disperse conduction bands often exists in these oxides due to the strong antibonding hybridization of the valence cation s and the O 2p orbitals. This electronic configuration is primarily found in elements from groups 12, 13 and 14 in the periodic table. However, ZnSb 2 O 6 has been recently proposed as an Sb(V)-based oxide with promising transparent conducting behavior, with unusually deep band edges and an interesting band alignment for optoelectronic applications. Sb is a group 15 element, but in its highest oxidation state (Sb(V)) it adopts the same (n-1)d 10 ns 0 np 0 electron configuration as conventional post-transition metal TCOs. Furthermore, the increased abundance of Sb can contribute to a reduction in manufacturing costs. The discovery of this material not only brings valuable diversity to the field, but also opens the possibility of Sb(V)-based oxides as lower-cost alternative TCOs. Following the success of ZnSb 2 O 6 , we consider the under-explored binary system Sb 2 O 5 as a potential candidate due to its wide bandgap and comparable electronic structure to established metal oxide TCOs.