Impact of Na Doping on the Carrier Transport Path in Polycrystalline Flexible Cu₂ZnSn(S,Se)₄ Solar Cells.

ABSTRACT: It is well-known that the alkali doping of polycrystalline Cu₂ZnSn(S,Se)₄ (CZTSSe) and Cu(In,Ga)(Se,S)₂ has a beneficial influence on the device performance and there are various hypotheses about the principles of performance improvement. This work clearly explains the effect of Na doping on the fill factor (FF) rather than on all of the solar cell parameters (open-circuit voltage, FF, and sometimes short circuit current) for overall performance improvement. When doping is optimized, the fabricated device shows sufficient built-in potential and selects a better carrier transport path by the high potential difference between the intragrains and the grain boundaries. On the other hand, when doping is excessive, the device shows low contact potential differenc

SUBMITTER: Jeong WL 

PROVIDER: S-EPMC7610331 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature