“…The existence of Bi 2 O 2 Se, which crystallises in the anti-ThCr 2 Si 2 structure type, was first reported by Boller [5]. The Bi-O-Se phase diagram was studied in detail by Oppermann et al [6][7][8][9][10][11], while the thermoelectric properties of Bi 2 O 2 Se were first reported by Ruleova et al [12]. Experimental [13,14], and theoretical studies [15,16], of this material, which is an n-type semiconductor with a reported ZT ¼0.007 at 300 K [12], have been carried out.…”