Mitigation of Self-p-Doping and Off-Centering Effect in Tin Perovskite via Strontium Doping
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.
Authors
- Muhammad Okash Ur Rehman
- Shengnan Zuo (ORCID: https://orcid.org/0009-0005-4842-9871)
- Artem Musiienko (ORCID: https://orcid.org/0000-0002-2259-8387)
- Antonio Abate (ORCID: https://orcid.org/0000-0002-3012-3541)
- Mahmoud H. Aldamasy (ORCID: https://orcid.org/0000-0003-3331-5570)
- Noor Titan Putri Hartono (ORCID: https://orcid.org/0000-0002-0748-0620)
- Chiara Frasca (ORCID: https://orcid.org/0009-0003-9503-670X)
- Giuseppe Nasti (ORCID: https://orcid.org/0000-0003-0867-2402)
- Karunanantharajah Prashanthan (ORCID: https://orcid.org/0000-0001-6042-7055)
- René Schwiddessen (ORCID: https://orcid.org/0000-0002-8898-8820)
- Paola Alippi (ORCID: https://orcid.org/0000-0003-4276-7501)
Institutions
- National Agency for New Technologies, Energy and Sustainable Economic Development (IT)
- University of Jaffna (LK)
- Bielefeld University (DE)
- Helmholtz-Zentrum Berlin für Materialien und Energie (DE)
- Institute of Structure of Matter (IT)
- University of Naples Federico II (IT)
Publication Details
- Journal
- ACS Energy Letters
- Published
- 2024-12-31
- DOI
- https://doi.org/10.1021/acsenergylett.4c02974
- Citations
- 11
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 2.30
Funders
- Deutscher Akademischer Austauschdienst
- HORIZON EUROPE Marie Sklodowska-Curie Actions