Epitaxial Antiferroelectric Bi<sub>2</sub>O<sub>2</sub>S Films with Superior Photoresponse
Two-dimensional bismuth oxychalcogenide is a rising material system with superior electronic properties. However, a lack of high-quality synthesis impedes the exploration of fundamental understanding and practical applications. This work presents high-quality epitaxial Bi<sub>2</sub>O<sub>2</sub>S films on (LaAlO<sub>3</sub>)<sub>0.3</sub>(Sr<sub>2</sub>TaAlO<sub>6</sub>)<sub>0.7</sub> with diverse properties by taking advantage of lattice compatibility. The atomically resolved sharp interface of Bi<sub>2</sub>O<sub>2</sub>S/(LaAlO<sub>3</sub>)<sub>0.3</sub>(Sr<sub>2</sub>TaAlO<sub>6</sub>)<sub>0.7</sub> heteroepitaxy is observed with the verification of centrosymmetric breaking through microscopic evidence and macroscopic characterizations. Such an epitaxial feature of the Bi<sub>2</sub>O<sub>2</sub>S film provides an essential step for applications compared to those of chemically synthesized nanomaterials. The interior polarization and piezoelectricity can be investigated through atomic-scale observation and RhB degradation of BOS. Meanwhile, this synthesized system can achieve a strong photoresponse with an on/off ratio of ∼10<sup>4</sup> and a responsivity of ∼60 mA/W in the range of red light (620-750 nm). With these advantages, the demonstrated epitaxial Bi<sub>2</sub>O<sub>2</sub>S shows a huge potential for applications in high-performance optoelectronic devices.
Authors
- Chuan Lung Chuang (ORCID: https://orcid.org/0000-0003-2715-001X)
- Rong Huang (ORCID: https://orcid.org/0000-0002-2095-3883)
- Yu‐Lun Chueh (ORCID: https://orcid.org/0000-0002-0155-9987)
- Jyh Ming Wu (ORCID: https://orcid.org/0000-0001-9244-6621)
- Ying‐Hao Chu (ORCID: https://orcid.org/0000-0002-3435-9084)
- Yong-Jyun Wang
- Chih‐Wei Luo (ORCID: https://orcid.org/0000-0002-6453-7435)
- Wei‐Chun Lin (ORCID: https://orcid.org/0000-0001-5722-6383)
- Jianwei Zhang (ORCID: https://orcid.org/0000-0002-8482-6656)
- Yi‐Cheng Chen
- Heng‐Jui Liu (ORCID: https://orcid.org/0000-0002-0745-9370)
- Po-Chih Chu (ORCID: https://orcid.org/0000-0001-7851-1685)
- Zhenzhong Yang (ORCID: https://orcid.org/0000-0002-7226-7973)
- Yu‐Miin Sheu (ORCID: https://orcid.org/0000-0002-4495-0708)
- Jiayuan Sun (ORCID: https://orcid.org/0000-0003-3158-3256)
- Ki Soo Chang (ORCID: https://orcid.org/0000-0002-6067-2066)
- Hsiang‐Lin Liu (ORCID: https://orcid.org/0000-0003-1960-2776)
- Xin-Yun Chang
- Helen Lai Wah Chan
- Chia‐Chen Chung
Institutions
- National Taiwan Normal University (TW)
- National Sun Yat-sen University (TW)
- National Yang Ming Chiao Tung University (TW)
- National Chung Hsing University (TW)
- National Tsing Hua University (TW)
- National Synchrotron Radiation Research Center (TW)
- Advanced Materials and Devices (United States) (US)
- East China Normal University (CN)
- National Taipei University (TW)
Publication Details
- Journal
- ACS Applied Materials & Interfaces
- Published
- 2025-03-27
- DOI
- https://doi.org/10.1021/acsami.4c22419
- Citations
- 5
- Primary Topic
- 2D Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 2.59
Funders
- National Tsing Hua University
- National Science and Technology Council