At that time it became obvious that the miniaturization of vacuum tubes had met a technical limit and that alternative solutions had to be sought using solid state circuits and the principles of the earlier transistor inventions of Julius Edgar Lilienfeld, Oskar Heil, Walter Schottky, and Robert Wichard Pohl.
Because of the air raids on Berlin in 1943, the Telefunken laboratory was moved to the Cistercian abbey in Lubiąż (Leubus) Silesia, where Mataré focused on improving the cm-wave (SHF) receiver sensitivity.
Later Mataré taught physics and mathematics in Wabern near Kassel and gave lectures at the Aachen university, and he was invited to build a semiconductor diode plant for Compagnie des Freins et Signaux Westinghouse in Aulnay-sous-Bois near Paris.
Independently of American work, the German researchers Mataré and Heinrich Welker developed the first operational French transistor at Compagnie des Freins et Signaux Westinghouse in Aulnay-sous-Bois near Paris during the years 1945 to 1948.
In his book Conscientious Evolution (1982) he discussed a broad range of topics including genetic engineering, eugenic measures, controlled procreation, sterilization and capital punishment.