Recent progress of the native defects and p-type doping of zinc oxide*
Project supported by the State Key Program for Basic Research of China (Grant No. 2011CB302003), the National Natural Science Foundation of China (Grant Nos. 61274058, 61322403, 61504057, and 61574075), the Natural Science Foundation of Jiangsu Province, China (Grant Nos. BK20130013 and BK20150585), and the Six Talent Peaks Project in Jiangsu Province, China (Grant No. 2014XXRJ001).
(color online) Calculated K VB offset , CB offset , and band-gap energy . Energies are in units of eV referenced to (ZnO) = 0 eV with an estimated error bar of eV. Thick (red) lines show T = 300 K results from UPS and optical characterization with eV error bar. (Blue) marks depict calculated ionization energies -{}(0/–) of N acceptors, where ) represents N with a (with no) neighboring Zn–S bond. The strong VB-offset bowing renders the ZnO-like N acceptors thus shallow. Measured ZnO:N ionization energy is eV.[23]