Structural parameter and Opitacal absorption measurement of Cu In_(1-x) Gax Se_2 Solar Cells

摘要

Thin film polycrystalline solar cells based CuIn1-xGaxSe_2 have been fabricated and studied with x values from 0 to 1.0. The lattice parameters, grain size, and band gap were measured. Crystal structure and X-ray data of CuIn1-xGaxSe_2 were determined using X-ray diffractometry. These materials had a cubic structure with x ≥ 0.5 and a tetragonal structure with x ≤ 0.5. The lattice constant vary linearly with composition. The variation in band gap with composition was determined for these films from optical absorption measurement, which showed that the band gap varied linearly over composition range. Grain size was measured using scanning electron microscopy (SEM) where the grain size measured linearly with Ga Content.