This letter fabricated the CNTS thin films by an electrodeposition technique.

Synthesis and understanding of the fundamental properties of CNTS are investigated.

CNTS showed the high absorption coefficient and a suitable optimal band gap.

The CNTS/CdS heterojunction was coherent that was important for thin-film PVs.

The valences of the constituents of CNTS thin film were Cu<sup>+1sup>, Ni<sup>+2sup>, Sn<sup>+4sup> and S<sup>−2sup>.