Halogen Vacancies Enable Ligand-Assisted Self-Assembly of Perovskite Quantum Dots into Nanowires

Jun Pan, Xiyan Li, Xiwen Gong, Jun Yin, Dianli Zhou, Lutfan Sinatra, Renwu Huang, Jiakai Liu, Jie Chen, Ibrahim Dursun, Ahmed M. El-Zohry, Makhsud I. Saidaminov, Hong Tao Sun, Omar F. Mohammed, Changhui Ye, Edward H. Sargent*, Osman M. Bakr

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

52 Scopus citations

Abstract

Interest has been growing in defects of halide perovskites in view of their intimate connection with key material optoelectronic properties. In perovskite quantum dots (PQDs), the influence of defects is even more apparent than in their bulk counterparts. By combining experiment and theory, we report herein a halide-vacancy-driven, ligand-directed self-assembly process of CsPbBr3 PQDs. With the assistance of oleic acid and didodecyldimethylammonium sulfide, surface-Br-vacancy-rich CsPbBr3 PQDs self-assemble into nanowires (NWs) that are 20–60 nm in width and several millimeters in length. The NWs exhibit a sharp photoluminescence profile (≈18 nm full-width at-half-maximum) that peaks at 525 nm. Our findings provide insight into the defect-correlated dynamics of PQDs and defect-assisted fabrication of perovskite materials and devices.

Original languageEnglish (US)
Pages (from-to)16077-16081
Number of pages5
JournalAngewandte Chemie - International Edition
Volume58
Issue number45
DOIs
StatePublished - Nov 4 2019

Keywords

  • CsPbBr
  • halide vacancy
  • nanowire
  • perovskite quantum dot
  • self-assembly

ASJC Scopus subject areas

  • General Chemistry
  • Catalysis

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