Janus CsPbBr<sub>3</sub>–AgBiS<sub>2</sub> Heteronanocrystals for High-Efficiency Photodetectors
Heteronanocrystals (HNCs) composed of colloidal lead halide perovskites and chalcogenides always offer unique photoelectric properties. Nevertheless, synthesizing perovskite-chalcogenide HNCs has been a tough challenge due to their completely different growth dynamics. Here, we present an effective strategy to synthesize Janus CsPbBr<sub>3</sub>-AgBiS<sub>2</sub> HNCs by in situ growth of CsPbBr<sub>3</sub> NCs on prepared AgBiS<sub>2</sub> quantum dot (QDs). The as-synthesized HNCs show a large range of absorption characteristics from visible to near-infrared (NIR) wavebands. Femtosecond transient absorption (TA) spectroscopy reveals the transfer of both electron and hole from CsPbBr<sub>3</sub> to AgBiS<sub>2</sub>. The enhanced absorption range and exciton dissociation in 150 °C HNCs leads to photoconductors with drastically improved responsivity (<i>R</i> of 183.8 A W<sup>-1</sup>) and specific detectivity (<i>D</i>* of 5.0 × 10<sup>14</sup> Jones). This work not only provides a reliable method for combining ionic CsPbBr<sub>3</sub> and covalent AgBiS<sub>2</sub> but also has great potential for future practical applications, such as an NC (QD) solar cell.
Authors
- Meicheng Li (ORCID: https://orcid.org/0000-0002-0731-741X)
- Xiaojun Lv (ORCID: https://orcid.org/0000-0002-8040-881X)
- Hengwei Qiu (ORCID: https://orcid.org/0000-0002-2947-0626)
- Weiyan Hu (ORCID: https://orcid.org/0000-0002-6340-4104)
- Yongqiang Ji (ORCID: https://orcid.org/0000-0002-0848-9643)
- Lin Zhang (ORCID: https://orcid.org/0000-0002-2186-6837)
- Feiyang Liu (ORCID: https://orcid.org/0009-0007-7057-8739)
- Donglin Jia (ORCID: https://orcid.org/0009-0006-8115-1020)
Institutions
- North China Electric Power University (CN)
- Henan Academy of Sciences (CN)
- Primary Source (US)
- FZU ‒ Institute of Physics of the Academy of Sciences of the Czech Republic (CZ)
- State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources
Publication Details
- Journal
- Nano Letters
- Published
- 2025-03-04
- DOI
- https://doi.org/10.1021/acs.nanolett.4c06595
- Citations
- 13
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 9.50
Funders
- National Natural Science Foundation of China
- State Key Laboratory Of Alternate Electrical Power System With Renewable Energy Sources
- Beijing Municipal Natural Science Foundation
- National Key Research and Development Program of China
- Fundamental Research Funds for the Central Universities