[Problem] To provide a method for efficiently forming a carbon
boron nitride-containing film on a substrate; a substrate on which a carbon
boron nitride-containing film has been formed by the method; and a product comprising the substrate. [Solution] For example, a carbon-
nitrogen source compound represented by formula (1) is used: R13E-N = C = N-ER13 [in formula (1), E is independently Si, Ge, or Sn, and R1 is independently a linear or cyclic C1-C6
alkyl group, C2-C6 alkenyl group, or C1-C6 alkynyl group].