Abstract The superconductivity of the FeSe-based superconductor is extremely sensitive to Fe vacancies in FeSe plane. In order reduce formation plane, various low-temperature methods are developed. However, it still complex and time consuming control concentration. Here, a hybrid iron-based superconductor, Li 0.21 Se 0.05 (EG) 0.26 (EG: ethylene glycol, C 2 H 6 O ), synthesized by solvothermal ...