Dresden 2020 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 15: Postersession KFM
KFM 15.25: Poster
Donnerstag, 19. März 2020, 16:00–18:30, P2/1OG
Nano-Characterization of Cu(In,Ga)(Se,S)2 Solar Cells for Efficiency Improvement — •Sibylle Schwartmann, Oana Cojocaru-Mirédin, Jens Keutgen, Mohit Raghuwanshi, and Matthias Wuttig — RWTH-Aachen
The current record efficiency for Cu(In,Ga) (Se,S)2 solar cells is at 22.6% [1]. This novel record was mainly due to a sodium post deposition treatment (Na-PDT). Besides Na-PDT, interdiffusion at the heterointerface of the p-n junction has a great influence on the efficiency as well by greatly influencing the band alignment between the layers involved. Therefore, understanding the effects of Na-PDT and interdiffusion on a nanometer level will help in understanding the mechanism responsible for the efficiency improvement of the Cu(In,Ga) (Se,S)2 solar cell. In this work, atom probe tomography (APT) and cross-sectional electron beam induced current (EBIC) measurements are done on a solar cell with Cu(In,Ga) (Se,S)2 absorber and Zn(S,O) buffer. The APT allows to determine the composition at nanoscale, while EBIC allows the determination of electrical properties of the p-n junction at sub-micrometer scale. Our recent APT results show that the grading of selenium and sulfur in the absorber were successfully realized. Moreover, noticeable interdiffusion of Se and S takes place. [1]Raghuwanshi et al. ( 2017) Influence of Na on grain boundary and properties of Cu(In,Ga)Se2 solar cells. Prog. Photovolt: Res. Appl., 25: 367– 375.