Pressure-Engineered Optical and Charge Transport Properties of Mn2+/Cu2+Codoped CsPbCl3Perovskite Nanocrystals via Structural Progression

Junkai Zhang, Yuzhu Zheng, Guangtao Liu, Yanzhang Ma, Lei Gong, Renquan Guan, Xiaoyan Cui, Jiejuan Yan, Jialong Zhao, Jinghai Yang

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

In this work, compared with the corresponding pure CsPbCl3 nanocrystals (NCs) and Mn2+-doped CsPbCl3 NCs, Mn2+/Cu2+-codoped CsPbCl3 NCs exhibited improved photoluminescence (PL) and photoluminescence quantum yields (PL QYs) (57.6%), prolonged PL lifetimes (1.78 ms), and enhanced thermal endurance (523 K) as a result of efficient Mn2+ doping (3.66%) induced by the addition of CuCl2. Furthermore, we applied pressure on Mn2+/Cu2+-codoped CsPbCl3 NCs to reveal that a red shift of photoluminescence followed by a blue shift was caused by band gap evolution and related to the structural phase transition from cubic to orthorhombic. Moreover, we also found that under the preheating condition of 523 K, such phase transition exhibited obvious morphological invariance, accompanied by significantly enhanced conductivity. The pressure applied to the products treated with high temperature enlarged the electrical difference and easily intensified the interface by closer packaging. Interestingly, defect-triggered mixed ionic and electronic conducting (MIEC) was observed in annealed NCs when the applied pressure was 2.9 GPa. The pressure-dependent ionic conduction was closely related to local nanocrystal amorphization and increased deviatoric stress, as clearly described by in situ impedance spectra. Finally, retrieved products exhibited better conductivity (improved by 5-6 times) and enhanced photoelectric response than those when pressure was not applied. Our findings not only reveal the pressure-tuned optical and electrical properties via structural progression but also open up the promising exploration of more amorphous all-inorganic CsPbX3-based photoelectric applications.

Original languageEnglish
Pages (from-to)48225-48236
Number of pages12
JournalACS Applied Materials and Interfaces
Volume12
Issue number42
DOIs
StatePublished - Oct 21 2020

Keywords

  • electric response
  • high pressure
  • perovskite nanocrystals
  • phase transition
  • photoluminescence

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