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Ligand-assisted cation-exchange engineering for high-efficiency colloidal Cs(1-x)FA(x)PbI(3) quantum dot solar cells with reduced phase segregation
Hao, Mengmeng; Bai, Yang; Zeiske, Stefan; Ren, Long; Liu, Junxian; Yuan, Yongbo; Zarrabi, Nasim; Cheng, Ningyan; Ghasemi, Mehri; Chen, Peng; Lyu, Miaoqiang; He, Dongxu; Yun, Jung-Ho; Du, Yi; Wang, Yun; Ding, Shanshan; Armin, Ardalan; Meredith, Paul; Liu, Gang; Cheng, Hui-Ming; Wang, Lianzhou
2020
Source PublicationNATURE ENERGY
Volume5Issue:1Pages:79-88
AbstractMixed-cation perovskite quantum dot solar cells possess decent phase stability but considerably low efficiency. Here Hao et al. show that ligands are key to the formation of quantum dots with lower defect density and demonstrate devices that are more stable and efficient than their bulk counterparts.The mixed caesium and formamidinium lead triiodide perovskite system (Cs(1-x)FA(x)PbI(3)) in the form of quantum dots (QDs) offers a pathway towards stable perovskite-based photovoltaics and optoelectronics. However, it remains challenging to synthesize such multinary QDs with desirable properties for high-performance QD solar cells (QDSCs). Here we report an effective oleic acid (OA) ligand-assisted cation-exchange strategy that allows controllable synthesis of Cs(1-x)FA(x)PbI(3) QDs across the whole composition range (x = 0-1), which is inaccessible in large-grain polycrystalline thin films. In an OA-rich environment, the cross-exchange of cations is facilitated, enabling rapid formation of Cs(1-x)FA(x)PbI(3) QDs with reduced defect density. The hero Cs(0.5)FA(0.5)PbI(3) QDSC achieves a certified record power conversion efficiency (PCE) of 16.6% with negligible hysteresis. We further demonstrate that the QD devices exhibit substantially enhanced photostability compared with their thin-film counterparts because of suppressed phase segregation, and they retain 94% of the original PCE under continuous 1-sun illumination for 600 h.
DOI10.1038/s41560-019-0535-7
WOS IDWOS:000508323000004
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/83214
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Hao, Mengmeng,Bai, Yang,Zeiske, Stefan,et al. Ligand-assisted cation-exchange engineering for high-efficiency colloidal Cs(1-x)FA(x)PbI(3) quantum dot solar cells with reduced phase segregation[J]. NATURE ENERGY,2020,5(1):79-88.
APA Hao, Mengmeng.,Bai, Yang.,Zeiske, Stefan.,Ren, Long.,Liu, Junxian.,...&Wang, Lianzhou.(2020).Ligand-assisted cation-exchange engineering for high-efficiency colloidal Cs(1-x)FA(x)PbI(3) quantum dot solar cells with reduced phase segregation.NATURE ENERGY,5(1),79-88.
MLA Hao, Mengmeng,et al."Ligand-assisted cation-exchange engineering for high-efficiency colloidal Cs(1-x)FA(x)PbI(3) quantum dot solar cells with reduced phase segregation".NATURE ENERGY 5.1(2020):79-88.
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