A transparent metal: Nb-doped anatase TiO_2

摘要

This Letter focuses on the discovery of a transparent conducting oxide (TCO), anatase Ti_(1-x)Nb_xO_2 films with x=0.002-0.2. The resistivity of films with x ≥ 0.03 is 2-3 x 10~(-4) Ω cm at room temperature. The carrier density of Ti_(1-x)Nb_x can be controlled in a range of 1 x 10~(19) to 2 x 10~(21) cm~(-3). The internal transmittance for films with x ≤ 0.03 (40 nm thickness) is about 97% in the visible light region. The transport and optical parameters are comparable to those of typical TCOs, such as In_(2-x)Sn_xO_3 and ZnO.