Quantum Dot Enabled Cation Exchange in Halide Perovskites for Photovoltaics and Infrared Photodetectors
Tailoring the photophysical properties of halide perovskites is a promising strategy to simultaneously address defects, modulate carrier dynamics, and expand the spectral response. Quantum dots (QDs) are promising candidates to functionalize perovskites; however, the interaction mechanisms between robust-lattice QDs and ionic perovskites remain unclear. Here, we pioneer a cation exchange approach using CdSe QDs to functionalize lead halide perovskites, where Cd2+ replaces Pb2+ and diffuses throughout the perovskite matrix. This cation exchange achieves dual benefits: (1) efficient defect passivation via Cd2– diffusion and Se2– coordination with undercoordinated Pb2+, and (2) extended infrared light response up to 1200 nm attributed to in situ formed PbSe QDs. The champion perovskite solar cells delivered a power conversion efficiency of 24.8%, significantly outperforming the control devices (23.0%). Moreover, infrared PbSe QDs formed enable broadband detection to infrared spectrum (300–1200 nm), with a detectivity of 2.9 × 1011 Jones at 1170 nm under −0.3 V bias. Extension of this strategy to CdS QDs further confirmed this cation exchange mechanism. Therefore, our work establishes a versatile, scalable interface-engineering method between robust-lattice QDs and perovskites, paving the way for multifunctional optoelectronic applications.
Authors
- Yuerui Lu (ORCID: https://orcid.org/0000-0001-6131-3906)
- Liang Gao (ORCID: https://orcid.org/0000-0003-4391-8447)
- Fandi Chen (ORCID: https://orcid.org/0000-0002-4298-2925)
- Shujuan Huang (ORCID: https://orcid.org/0000-0003-3468-4773)
- Chao Chen (ORCID: https://orcid.org/0000-0002-8706-5346)
- Chun‐Ho Lin (ORCID: https://orcid.org/0000-0003-0882-4728)
- Tom Wu (ORCID: https://orcid.org/0000-0003-0845-4827)
- Jincheol Kim (ORCID: https://orcid.org/0000-0001-7374-2740)
- Xinwei Guan (ORCID: https://orcid.org/0000-0002-0100-480X)
- Anchao Yang (ORCID: https://orcid.org/0000-0001-9179-5571)
- Songyan Yin (ORCID: https://orcid.org/0000-0002-1109-9195)
- Tao Wan (ORCID: https://orcid.org/0000-0001-9345-8624)
- Xiaoran Zheng (ORCID: https://orcid.org/0000-0002-7016-5260)
- Tingting Mei (ORCID: https://orcid.org/0000-0001-6362-8944)
- Dewei Chu (ORCID: https://orcid.org/0000-0003-4581-0560)
- Gang Wang (ORCID: https://orcid.org/0009-0000-0228-0120)
- Zhi Li (ORCID: https://orcid.org/0000-0002-2211-2092)
- Mengyao Li (ORCID: https://orcid.org/0000-0003-2379-2058)
- Bin Gong (ORCID: https://orcid.org/0000-0001-9416-2665)
- Won‐Seok Chae (ORCID: https://orcid.org/0000-0003-0551-525X)
- Long Hu (ORCID: https://orcid.org/0000-0001-6844-7720)
- Yuhong Jiang (ORCID: https://orcid.org/0000-0003-0283-3658)
- Jonghoon Han
- Beining Dong (ORCID: https://orcid.org/0009-0000-3052-7821)
- Omar Ahmad
Institutions
- Australian National University (AU)
- Xinyang Normal University (CN)
- Ministry of Education of the People's Republic of China (CN)
- Hong Kong Polytechnic University (HK)
- Jilin Normal University (CN)
- UNSW Sydney (AU)
- Wuhan National Laboratory for Optoelectronics (CN)
- Huazhong University of Science and Technology (CN)
- Macquarie University (AU)
Publication Details
- Journal
- ACS Energy Letters
- Published
- 2025-06-27
- DOI
- https://doi.org/10.1021/acsenergylett.5c01321
- Citations
- 3
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 2.19
Funders
- University of New South Wales
- Huazhong University of Science and Technology
- Australian Research Council