Palladium‐Doped Cs <sub>2</sub> AgBiBr <sub>6</sub> with 1300 nm Near‐Infrared Photoresponse
Lead-free halide double perovskite (HDP) Cs<sub>2</sub>AgBiBr<sub>6</sub> has set a benchmark for research in HDP photoelectric applications due to its attractive optoelectronic properties. However, its narrow absorption range is a key limitation of this material. Herein, a novel dopant, palladium (Pd), is doped into Cs<sub>2</sub>AgBiBr<sub>6</sub> and significantly extends the absorption to ≈1400 nm. Pd<sup>2+</sup> ions are partially doped in the host lattice, most probably replacing Ag atoms and introducing a sub-bandgap state within the host bandgap, as indicated by the combination of spectroscopical measurements and theoretical calculations. Importantly, this sub-bandgap state extends the photoresponse of Cs<sub>2</sub>AgBiBr<sub>6</sub> up to the NIR-II region of 1300 nm, setting a new record for HDPs. This work demonstrates a novel and efficient dopant for HDPs and highlights the effectiveness of employing a sub-bandgap to broaden the absorption of HDPs, shedding new light on tailoring large bandgap HDPs for NIR optoelectronic applications.
Authors
- Dehui Li (ORCID: https://orcid.org/0000-0002-5945-220X)
- Jiřı́ Brus (ORCID: https://orcid.org/0000-0003-2692-612X)
- Libor Kobera (ORCID: https://orcid.org/0000-0002-8826-948X)
- S. I. Simak (ORCID: https://orcid.org/0000-0002-1320-389X)
- Fuxiang Ji (ORCID: https://orcid.org/0000-0002-7794-8348)
- Xinyi Cai (ORCID: https://orcid.org/0000-0002-9403-0061)
- Yuequn Shang (ORCID: https://orcid.org/0000-0002-2229-9897)
- Weihua Ning (ORCID: https://orcid.org/0000-0003-2432-423X)
- Tinghao Lin
- Hongwei Lei (ORCID: https://orcid.org/0000-0001-7208-4061)
- Zuojun Tan (ORCID: https://orcid.org/0000-0003-4380-1388)
- Sabina Abbrent (ORCID: https://orcid.org/0000-0003-4228-4059)
- Andrii Mahun (ORCID: https://orcid.org/0000-0003-1057-2910)
- Igor A. Abrikosov (ORCID: https://orcid.org/0000-0001-7551-4717)
- Feng wei Gao (ORCID: https://orcid.org/0000-0002-2582-1740)
- Utkarsh Singh (ORCID: https://orcid.org/0000-0002-5150-6189)
Institutions
- Linköping University (SE)
- Uppsala University (SE)
- Huazhong Agricultural University (CN)
- Czech Academy of Sciences, Institute of Macromolecular Chemistry (CZ)
- Wuhan National Laboratory for Optoelectronics (CN)
- Huazhong University of Science and Technology (CN)
Publication Details
- Journal
- Small
- Published
- 2024-09-20
- DOI
- https://doi.org/10.1002/smll.202404188
- Citations
- 4
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 0.83
Funders
- National Natural Science Foundation of China
- Grantová Agentura České Republiky
- National Science Council
- Natural Science Foundation of Hubei Province
- Linköpings Universitet
- Knut och Alice Wallenbergs Stiftelse
- Vetenskapsrådet
- Energimyndigheten
- Wuhan University
- Wuhan Institute of Technology
- European Research Council
- Fundamental Research Funds for the Central Universities