Revealing Electrical-Poling-Induced Polarization Potential in Hybrid Perovskite Photodetectors

Chuntao Lan, Haiyang Zou, Longfei Wang, Meng Zhang, Shuang Pan, Ying Ma, Yiping Qiu, Zhong Lin Wang, Zhiqun Lin

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

Despite recent rapid advances in metal halide perovskites for use in optoelectronics, the fundamental understanding of the electrical-poling-induced ion migration, accounting for many unusual attributes and thus performance in perovskite-based devices, remain comparatively elusive. Herein, the electrical-poling-promoted polarization potential is reported for rendering hybrid organic–inorganic perovskite photodetectors with high photocurrent and fast response time, displaying a tenfold enhancement in the photocurrent and a twofold decrease in the response time after an external electric field poling. First, a robust meniscus-assisted solution-printing strategy is employed to facilitate the oriented perovskite crystals over a large area. Subsequently, the electrical poling invokes the ion migration within perovskite crystals, thus inducing a polarization potential, as substantiated by the surface potential change assessed by Kelvin probe force microscopy. Such electrical-poling-induced polarization potential is responsible for the markedly enhanced photocurrent and largely shortened response time. This work presents new insights into the electrical-poling-triggered ion migration and, in turn, polarization potential as well as into the implication of the latter for optoelectronic devices with greater performance. As such, the utilization of ion-migration-produced polarization potential may represent an important endeavor toward a wide range of high-performance perovskite-based photodetectors, solar cells, transistors, scintillators, etc.

Original languageEnglish
Article number2005481
JournalAdvanced Materials
Volume32
Issue number47
DOIs
StatePublished - 26 Nov 2020

Bibliographical note

Publisher Copyright:
© 2020 Wiley-VCH GmbH

Keywords

  • electrical poling
  • hybrid perovskites
  • ion migration
  • photodetectors
  • polarization potential

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