Role of Si as carrier suppressor in amorphous Zn-Sn-O
- Role of Si as carrier suppressor in amorphous Zn-Sn-O
- IlJoon Kang; Chul Hong Park; 정유진; 이상렬
- Amorphous; Oxide semiconductor; O-Deficiency; ZnSnO; ZTO; Vacancy; Suppressor; Doping
- Issue Date
- Current applied physics
- VOL 12, S12-S16
- Through the first-principles study, we investigated the microscopic properties of oxygen vacancy in the
amorphous Zn2SnO4 (a-ZTO) and the amorphous Si-doped Zn2SnO4 (a-SZTO). The oxygen vacancy (V(O))
is found to play a role of shallow donor as sources of n-type conductivity in the both a-ZTO and a-SZTO.
In both materials, V(O) is preferred to couple with Sn, and the coordination number (CN) of Sn is overall
reduced by O-deficiency. However, an interesting finding is that in the presence of Si, the formation of
V(O) can be significantly suppressed, and the formation enthalpy is calculated to be increased. The
computational results suggest that Si atom can be an excellent carrier suppressor in a-ZTO. We also find
that the effective mass of electron carrier is increased in the presence of Si. These results can be
explained in the respect of the overall decrease of the oxygen coordination numbers of Sn atoms by the
strain effect induced by Si.
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