Mitigation of Self-p-Doping and Off-Centering Effect in Tin Perovskite via Strontium Doping
Year: 2024
Type: article
Abstract: Tin-based perovskite solar cells offer a less toxic alternative to their lead-based counterparts. Despite their promising optoelectronic properties, their performances still lag behind, with the highest power conversion efficiencies reaching around 15%. This efficiency limitation arises primarily from electronic defects leading to self-p-doping and stereochemical activity of the Sn(II) ion, which distorts the atomic arrangement in the material. In this study, we investigate the effect of strontium doping in tin-based perovskite on the distortion of the material's structure and its optoelectronic properties. Using a combination of Density Functional Theory calculations and experiments, we demonstrate that strontium doping reduces p-doping and structural strain. This approach improves the efficiency from 6.3% in undoped devices to 7.5% in doped devices without relying on dimethyl sulfoxide, a harmful solvent for tin-based perovskites. This method could enable precise control of tin off-centering and self-p-doping, advancing the development of efficient and stable tin perovskite solar cells.
Source: ACS Energy Letters
Institutions: Helmholtz-Zentrum Berlin für Materialien und Energie, Institute of Structure of Matter, National Research Council, University of Jaffna, National Agency for New Technologies, Energy and Sustainable Economic Development, ENEA Portici Research Centre, University of Naples Federico II, Bielefeld University
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,500
OpenAlex ID: W4405930723