Giant switchable ferroelectric photovoltage in double-perovskite epitaxial films through chemical negative strain
Double-perovskite films have been extensively studied in multifunctional fields due to their modifiability. Here, a controlled process strategy to induce chemical strain and anomalous Poisson deformation is proposed for perovskite-based films. The chemical negative strain in the local-ordering BiSmFe<sub>2</sub>O<sub>6</sub> double-perovskite films can be regulated by oxygen engineering to cause the effectively tunable bandgap. We markedly increased the switchable open-circuit voltage to ~1.56 V from ~0.50 V for Pt/BiSmFe<sub>2</sub>O<sub>6</sub>/Nb-SrTiO<sub>3</sub> devices, which is the highest in single-layer perovskite-based ferroelectric photovoltaic perpendicular devices under white light-emitting diode irradiation. The multifield composite action mechanism reveals the electrical cause of the large open-circuit voltage. The synergy of the optical fields and ferroelectric fields provides the possibility of multilevel storage. Structural characterizations indicate that the chemical strain offers a dual role of lattice distortion and vacancy migration. The strategy of controllable chemical strain facilitates further exploration of the application potential of ferroelectric materials for multifunctional electronic devices.
Authors
- Yue‐Wen Fang (ORCID: https://orcid.org/0000-0003-3674-7352)
- Jing Xia (ORCID: https://orcid.org/0000-0001-6092-1344)
- Yueyang Jia (ORCID: https://orcid.org/0000-0003-3663-9765)
- Linxing Zhang (ORCID: https://orcid.org/0000-0002-6767-2771)
- Rui Yang (ORCID: https://orcid.org/0000-0003-3860-7206)
- Hangren Li (ORCID: https://orcid.org/0000-0001-8075-6163)
- Xudong Liu (ORCID: https://orcid.org/0000-0003-0500-154X)
- Guoqiang Xi (ORCID: https://orcid.org/0000-0003-4063-8407)
- Jiaqi Ding (ORCID: https://orcid.org/0009-0008-8269-7126)
- Xiangmin Meng (ORCID: https://orcid.org/0000-0002-1667-2632)
- X. G. Liu (ORCID: https://orcid.org/0009-0005-9747-3289)
- Siyuan Du (ORCID: https://orcid.org/0000-0001-5215-0535)
- Jianjun Tian (ORCID: https://orcid.org/0000-0002-4008-0469)
- Xiaolong Li (ORCID: https://orcid.org/0000-0002-1674-9345)
- Dong-Fei Lu (ORCID: https://orcid.org/0000-0002-0350-3522)
- Jie Tu (ORCID: https://orcid.org/0000-0001-5156-4795)
- Mengqi Zhang (ORCID: https://orcid.org/0000-0003-2090-6320)
- Xianran Xing (ORCID: https://orcid.org/0000-0003-0704-8886)
- Rong Wu (ORCID: https://orcid.org/0000-0002-9065-4707)
- Yuzhuo Liu (ORCID: https://orcid.org/0000-0002-8679-8759)
- Yuan Meng (ORCID: https://orcid.org/0009-0007-6636-8325)
- Longyuan Shi
Institutions
- Hunan University (CN)
- Shanghai Jiao Tong University (CN)
- Chinese Academy of Sciences (CN)
- Shanghai Advanced Research Institute (CN)
- Material Physics Center (ES)
- Technical Institute of Physics and Chemistry (CN)
- Donostia International Physics Center (ES)
- University of Science and Technology Beijing (CN)
Publication Details
- Journal
- Science Advances
- Published
- 2025-04-23
- DOI
- https://doi.org/10.1126/sciadv.ads4925
- Citations
- 13
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 9.50