Electrical transport, optical and thermal properties of polyaniline-pumice composites

► Polyaniline/pumice composite have shown semiconducting behavior with low resistivity and high band gap. ► The dominant conduction mechanism was found to be Mott's variable range hopping. ► Thermal stability of pure polyaniline was increased with increasing pumice weight fraction. ► The composite could be a promising candidate as window layer organic semiconductor in heterojunction solar cell applications.