Surface Engineering Enables Efficient AgBiS<sub>2</sub> Quantum Dot Solar Cells
Surface ligand chemistry is vital to control the synthesis, diminish surface defects, and improve the electronic coupling of quantum dots (QDs) toward emerging applications in optoelectronic devices. Here, we successfully develop highly homogeneous and dispersed AgBiS<sub>2</sub> QDs, focus on the control of interdot spacing, and substitute the long-chain ligands with ammonium iodide in solution. This results in improved electronic coupling of AgBiS<sub>2</sub> QDs with excellent surface passivation, which greatly facilitates carrier transport within the QD films. Based on the stable AgBiS<sub>2</sub> QD dispersion with the optimal ligand state, a homogeneous and densely packed QD film is prepared by a facile one-step coating process, delivering a champion power conversion efficiency of approximately 8% in the QD solar cells with outstanding shelf life stability. The proposed surface engineering strategy holds the potential to become a universal preprocessing step in the realm of high-performance QD optoelectronic devices.
Authors
- Xiaoyu Yang (ORCID: https://orcid.org/0000-0001-5840-4057)
- Qixuan Zhong (ORCID: https://orcid.org/0000-0001-5751-9565)
- Lichen Zhao (ORCID: https://orcid.org/0000-0003-2537-6963)
- Peng Chen (ORCID: https://orcid.org/0000-0001-6146-3154)
- Haoming Yan (ORCID: https://orcid.org/0000-0002-5201-6368)
- Shunde Li (ORCID: https://orcid.org/0000-0002-6954-0035)
- Hengwei Qiu (ORCID: https://orcid.org/0000-0002-2947-0626)
- Qihuang Gong (ORCID: https://orcid.org/0000-0003-4974-6244)
- Fan Xu (ORCID: https://orcid.org/0000-0003-0833-1982)
- Yongqiang Ji (ORCID: https://orcid.org/0000-0002-0848-9643)
- Lei Li (ORCID: https://orcid.org/0000-0001-5304-8380)
- Rui Zhu (ORCID: https://orcid.org/0000-0001-7631-3589)
- Qiuyang Li (ORCID: https://orcid.org/0000-0002-0002-8092)
- Hongyu Xu (ORCID: https://orcid.org/0000-0002-5008-4615)
- Yun Xiao
Institutions
- Shanxi University (CN)
- Peking University (CN)
- University of Oxford (GB)
- Collaborative Innovation Center of Quantum Matter (CN)
- Shenzhen Technology University (CN)
- Tsinghua University (CN)
Publication Details
- Journal
- Nano Letters
- Published
- 2024-08-19
- DOI
- https://doi.org/10.1021/acs.nanolett.4c00959
- Citations
- 27
- Primary Topic
- Quantum Dots Synthesis And Properties
- Type
- article
- Field-Weighted Citation Impact
- 3.16
Funders
- National Natural Science Foundation of China
- China Postdoctoral Science Foundation
- Beijing Postdoctoral Science Foundation
- Peking University
- Yunnan Provincial Science and Technology Department
- China Oxford Scholarship Fund
- Beijing Municipal Natural Science Foundation
- Beijing Nova Program
- National Key Research and Development Program of China