LI-DOPED CZTS, SYNTHESIZED BY SPIN-COATING, FOR IMPROVED PV CELL PERFORMANCE
Ramadan ALITI, Yoganash PUTTHISIGAMANY, Mimoza RISTOVA
Abstract
In this work we present а comparative study of two photovoltaic cells based on n-type CZTS (Cu2ZnSnS4) kesterite-type thin films, using (a) an undoped pristine CZTS absorber and (b) doped with Li CZTS absorber, both integrated into photovoltaic (PV) cells, incorporating CdS thin film as an n-type buffer layer. The morphological, structural, compositional, optical, and electrical properties of both absorbers CZTS and CZTS:Li were studied by SEM-EDX, XRD, Vis-NIR spectroscopy, Hall-effect, and four-point probe measurements, revealing the impact on the Li-doping. The evaluation of the band gap was made using Tauc-plots. The influence of Li-doping in the CZTS films was scrutinized through the comparative study of the IV characteristics of PV cells. The results showed that the Li-doped CZTS yields better efficiency η=0,83% versus 0,53% for pristine CZTS absorber and better cell parameters, except for the Fill-Factor.
Pages:
489 - 497