The Impact of Ion Migration on the Electro-Optic Effect in Hybrid Organic–Inorganic Perovskites

Meng Jia Sun, Randy Sabatini, Pei Xi Wang, Amin Morteza Najarian, Koen Bertens, Andrew Johnston, Sjoerd Hoogland, Edward H. Sargent*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Electro-optic (EO) modulation allows the conversion of electrical signals to optical pulses and is widely employed in telecommunications and chip-to-chip interconnects. Recently, hybrid organic–inorganic perovskites (HOIPs) have been explored as candidates for EO modulators. To improve the EO performance, it is envisioned that halide doping will lower the symmetry of the crystal, enhancing spontaneous polarization. However, mixed halide perovskites are often associated with ion migration, which may impact their EO properties. Thus, the influence of ion migration on the EO efficiency is investigated using Br-doped Dion–Jacobson quasi-2D HOIPs, (4AMP)(MA)Pb2(Brx/I1−x)7 (4AMP = 4-(aminomethyl)piperidinium, MA = methylammonium). While density functional theory predicts a greater spontaneous polarization for the Br-doped sample, it is found that experimental results are affected by ion migration. The EO coefficient of the Br/I mixed sample is 95 pm V−1 at 1 kHz (≈50× higher than the undoped sample), but the response falls off rapidly with frequency. This frequency dependence is correlated with impedance spectroscopy, showing that the large EO signal results from ion migration. This study shows that ion migration impacts the EO analysis of mixed halide perovskites and must be considered in future EO studies.

Original languageEnglish (US)
Article number2107939
JournalAdvanced Functional Materials
Volume32
Issue number4
DOIs
StatePublished - Jan 19 2022

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics

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