¹ PG and Research Department of Physics, Raja Serfoji Govt. College (Affiliated to Bharathidasan University, Tiruchirappalli), Thanjavur, Tamilnadu, India

² Department of Physics, Kamadhenu College of Arts & Science, Dharmapuri, Tamilnadu, India

³ PG and Research Department of Physics, AVVM Sri Pushpam College (Affiliated to Bharathidasan University, Tiruchirappalli), Poondi, Tamilnadu, India

* Correspondence: arbalu757@gmail.com

A novel double doping (Mg+Li) has been performed on spray deposited CdO thin film. The structural, morphological, magnetic and optoelectronic properties of the double doped (Mg+Li), Mg-doped and undoped CdO thin films was studied and reported in this work. Crystallite size of pure CdO decreased from 33 nm to 28 nm with Mg-doping and to 24 nm with (Mg+Li) codoping. With (Mg+Li) codoping, nanosized grains are seen. Optical studies show that transparency of pure CdO increases with Mg and (Mg+Li) codoping and a maximum transmittance of 87 % was realized for the (Mg+Li) codoped film which possess a minimum electrical resistivity of 0.25 ×10^-2 Ω-cm with an increased figure of merit value (35.3 x 10^-2 Ω^-1), confirming its utility for optoelectronic devices. Paramagnetic nature of CdO becomes ferromagnetic with (Mg+Li) codoping. Ferromagnetic orderings observed for the (Mg+Li) codoped film might due to super-exchange interactions between Mg²⁺ and Li⁺ ions with Cd²⁺ ions in the CdO lattice.