In this study, a Sb2S3–Cu2S composite was synthesized by adding Cu2S, which exhibits a negative Poisson’s ratio in a two-dimensional structure, to improve the mechanical properties of the Sb2S3compound semiconductor. The sol–gel method was used for the preparation of Sb2S3precursor solution and after mixing synthesized by heat treatment at 260–280 °C. Cu2S growing in a plate-like structure with the Cu2S powders prepared by performing a sulfurization of Cu using polysulfide, it was spin-coated on gold-coated FTO glass substrates. Finally, the Cu2S powders were chemically combined with Sb2S3pillars to grow in the form of cudgels with acicular structures attached to the pillar structure. The acicular structure attached to the surface of the Sb2S3pillar structure was observed to be calcostibite (CuSbS2). The mechanical energy absorption of the bare Sb2S3pillar and Sb2S3–Cu2S cudgels structures was measured through nanoindentation experiments of flat-top tip with a diameter of 2 μm. It was observed that the external energy absorption (energy dissipation) ability of the Sb2S3–Cu2S cudgels structure was improved by more than five times which was compared to the bare Sb2S3pillar structure.