“…Arsenic (As) is situated in the 4th period and the VA group of the periodic table, with an outer electron configuration of 4s 2 3d 10 4p 3 . Several reports have been published on the research of As element doping modified semiconductor materials [14][15][16]. However, there is scarce research on doping As element in TiO 2 , possibly due to its carcinogenic hazard.…”