Structure and magnetism of Zn0.9Co0.1O DMS films prepared by chemical solution deposition method

► All the films have the ZnO wurtzite structure with a preferential orientation along the c-axis. ► Oxygen vacancies, which can induce a donor state overlapping with d states of Co atoms, exist in the films. ► No Co clusters and second phases exit in the films. ► Ferromagnetism is intrinsic behavior which can be explained by the formation of bound magnetic polarons.