Effect of O–O bonds on p-type conductivity in Ag-doped ZnO twin grain boundaries*

Project supported by the National Natural Science Foundation of China (Grant No. 11364009) and Natural Science Foundation of Guangxi Province, China (Grant No. 2014GXNSFFA118004).

Wu Jingjing1, 2, Tang Xin1, 2, †, Long Fei1, 2, Tang Biyu3
       

(color online) DOSs of bulk ZnO, GB7a, GB7b, GB7c and GB7d. The VBM of bulk ZnO is chosen to be zero in energy level.