Characterization Study of Band Gap, Resistivity, Crystal Structure, and Phase Identification of CuInSe2 Ternary Alloy

Characterization study of band gap, resistivity, crystal structure, and phase identification of CuInSe2 ternary alloy which is the synthesis result of Bridgman method by using modified simple single zone temperature, have been carried out. The phase identification and crystal structure of obtained polycrystal were characterized by X-ray diffraction. Then the X-ray diffractograms were analyzed by using crystallographic software package GSAS. Electrical resistivity and bandgap were measured by using Van der Pauw method. Identification and analysis of diffractogram show that ternary alloy of CuInSe2 has main phase of space group I 4 ad and lattice parameters a and c of 6,1173 A and 11,7144 A respectively. The other coexisting phases were identified as CuIn5Se8 with the space group P 4 2 m and Se with the space group P3121. Result from the resistivity measurement shows the resistivity is between (1,596 - 9,666) × 10 -3Ωm, and Bandgap is around 1,03 - 1,61 eV.