Manipulating crystallization dynamics through chelating molecules for bright perovskite emitters

Yatao Zou, Pengpeng Teng, Weidong Xu, Guanhaojie Zheng, Weihua Lin, Jun Yin, Libor Kobera, Sabina Abbrent, Xiangchun Li, Julian A. Steele, Eduardo Solano, Maarten B.J. Roeffaers, Jun Li, Lei Cai, Chaoyang Kuang, Ivan G. Scheblykin, Jiri Brus, Kaibo Zheng, Ying Yang, Omar F. MohammedOsman M. Bakr, Tönu Pullerits, Sai Bai, Baoquan Sun, Feng Gao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

60 Citations (Scopus)

Abstract

Molecular additives are widely utilized to minimize non-radiative recombination in metal halide perovskite emitters due to their passivation effects from chemical bonds with ionic defects. However, a general and puzzling observation that can hardly be rationalized by passivation alone is that most of the molecular additives enabling high-efficiency perovskite light-emitting diodes (PeLEDs) are chelating (multidentate) molecules, while their respective monodentate counterparts receive limited attention. Here, we reveal the largely ignored yet critical role of the chelate effect on governing crystallization dynamics of perovskite emitters and mitigating trap-mediated non-radiative losses. Specifically, we discover that the chelate effect enhances lead-additive coordination affinity, enabling the formation of thermodynamically stable intermediate phases and inhibiting halide coordination-driven perovskite nucleation. The retarded perovskite nucleation and crystal growth are key to high crystal quality and thus efficient electroluminescence. Our work elucidates the full effects of molecular additives on PeLEDs by uncovering the chelate effect as an important feature within perovskite crystallization. As such, we open new prospects for the rationalized screening of highly effective molecular additives.

Original languageEnglish
Article number4831
JournalNature Communications
Volume12
Issue number1
DOIs
Publication statusPublished - 1 Dec 2021

ASJC Scopus subject areas

  • General Chemistry
  • General Biochemistry,Genetics and Molecular Biology
  • General Physics and Astronomy

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