The enticement of fullerene molecular devices for erratic number of electronic and conductive characteristics depending upon the genre of doping is becoming the most research preferred area. The smallest possible fullerene C20 is highly enriched with miscellaneous properties and is extremely doping subtle. A number of doping based studies have been done in order to enrich the conductive nature of fullerene but lanthanides have not been considered for this purpose before. In this paper, 1/5th doping of capricious lanthanides in C20 molecular device have been studied. Doping effect of lanthanum, cerium, praseodymium, neodymium and promethium on C20 fullerene using a two probe device configuration has been delved. Transport properties were explored and compared which highlighted the superiority of Lanthanum doped device over cerium, praseodymium, neodymium and promethium doped C20 molecular devices. A careful sift has been made to study the effect of atomic radius and bonding strength on conductance of C20 doped devices. Differential conductive analysis highlighted the superconductivity feature of lanthanum doped C20 device over other doped devices

Lanthanide contraction; Extended Huckel theory; nuclear charge.