Propargyl bromide is effectively stabilized against shock or thermal decomposition by use therewith of an environmentally acceptable inert liquid solvent that forms an azeotrope with propargyl bromide. Firstly, a chip-stacked assembly is provided, comprising a substrate and a plurality of chips vertically stacked on the substrate where at least a first underfilling gap is formed between each two adjacent ones of the stacked chips with a height difference from the substrate. The shaft passes through a separator wall 1140. The shaft is adapted to be slidingly received in the bore and the channel. The film may include, for example, diamond-like carbon, graphene, or SiC having a pre-selected phase.