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journal article·2024-12Open access

Palladium‐Doped Cs 2 AgBiBr 6 with 1300 nm Near‐Infrared Photoresponse

Hongwei Lei, Utkarsh Singh, Fuxiang Ji, Tinghao Lin, Libor Kobera, Yuequn Shang, Xinyi Cai, Weihua Ning, Andrii Mahun, Sabina Abbrent, Zuojun Tan, Jiri Brus, Dehui Li, Sergei I. Simak, Igor A. Abrikosov, Feng Gao

Small· Volume 20· Issue 49
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Abstract

Abstract Lead‐free halide double perovskite (HDP) Cs 2 AgBiBr 6 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 2 AgBiBr 6 and significantly extends the absorption to ≈1400 nm. Pd 2+ 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 2 AgBiBr 6 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.
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Research context

Electronic materials

OpenAlex topics: Perovskite Materials and Applications · 2D Materials and Applications · Solid-state spectroscopy and crystallography

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

College of Engineering Huazhong Agricultural University Wuhan 430070 China

Department of Physics, Chemistry and Biology (IFM) Linköping University Linköping SE‐581 83 Sweden

School of Optical and Electronic Information and Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan 430074 China

Institute of Macromolecular Chemistry of the Czech Academy of Sciences Heyrovskeho nam. 2 Prague 162 00 Czech Republic

Department of Physics and Astronomy Uppsala University Uppsala SE‐751 20 Sweden

Funding

Fundamental Research Funds for the Central Universities · Wuhan Institute of Technology · Grantová Agentura České Republiky · Knut och Alice Wallenbergs Stiftelse · Energimyndigheten · European Research Council · National Natural Science Foundation of China

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