Influence of Bulky Organo-Ammonium Halide Additive Choice on the Flexibility and Efficiency of Perovskite Light-Emitting Devices

Lianfeng Zhao, Nicholas Rolston, Kyung Min Lee, Xunhua Zhao, Marcos A. Reyes-Martinez, Nhu L. Tran, Yao Wen Yeh, Nan Yao, Gregory D. Scholes, Yueh Lin Loo, Annabella Selloni, Reinhold H. Dauskardt, Barry P. Rand

Research output: Contribution to journalArticle

32 Scopus citations

Abstract

Perovskite light-emitting diodes (LEDs) require small grain sizes to spatially confine charge carriers for efficient radiative recombination. As grain size decreases, passivation of surface defects becomes increasingly important. Additionally, polycrystalline perovskite films are highly brittle and mechanically fragile, limiting their practical applications in flexible electronics. In this work, the introduction of properly chosen bulky organo-ammonium halide additives is shown to be able to improve both optoelectronic and mechanical properties of perovskites, yielding highly efficient, robust, and flexible perovskite LEDs with external quantum efficiency of up to 13% and no degradation after bending for 10 000 cycles at a radius of 2 mm. Furthermore, insight of the improvements regarding molecular structure, size, and polarity at the atomic level is obtained with first-principles calculations, and design principles are provided to overcome trade-offs between optoelectronic and mechanical properties, thus increasing the scope for future highly efficient, robust, and flexible perovskite electronic device development.

Original languageEnglish (US)
Article number1802060
JournalAdvanced Functional Materials
Volume28
Issue number31
DOIs
StatePublished - Aug 1 2018

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Keywords

  • flexible light-emitting diodes
  • metal halide perovskite
  • perovskite light-emitting diodes

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