300% Enhancement of Carrier Mobility in Uniaxial-Oriented Perovskite Films Formed by Topotactic-Oriented Attachment

Dong Hoe Kim, Jaehong Park, Zhen Li, Mengjin Yang, Ji Sang Park, Ik Jae Park, Jin Young Kim, Joseph J. Berry, Garry Rumbles, Kai Zhu

Research output: Contribution to journalArticle

68 Citations (Scopus)

Abstract

Organic–inorganic perovskites with intriguing optical and electrical properties have attracted significant research interests due to their excellent performance in optoelectronic devices. Recent efforts on preparing uniform and large-grain polycrystalline perovskite films have led to enhanced carrier lifetime up to several microseconds. However, the mobility and trap densities of polycrystalline perovskite films are still significantly behind their single-crystal counterparts. Here, a facile topotactic-oriented attachment (TOA) process to grow highly oriented perovskite films, featuring strong uniaxial-crystallographic texture, micrometer-grain morphology, high crystallinity, low trap density (≈4 × 1014 cm−3), and unprecedented 9 GHz charge-carrier mobility (71 cm2 V−1 s−1), is demonstrated. TOA-perovskite-based n-i-p planar solar cells show minimal discrepancies between stabilized efficiency (19.0%) and reverse-scan efficiency (19.7%). The TOA process is also applicable for growing other state-of-the-art perovskite alloys, including triple-cation and mixed-halide perovskites.

Original languageEnglish
Article number1606831
JournalAdvanced Materials
Volume29
Issue number23
DOIs
Publication statusPublished - Jun 20 2017

Keywords

  • carrier mobility
  • orientation
  • perovskite films
  • solar cells
  • topotactic-oriented attachment

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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  • Cite this

    Kim, D. H., Park, J., Li, Z., Yang, M., Park, J. S., Park, I. J., Kim, J. Y., Berry, J. J., Rumbles, G., & Zhu, K. (2017). 300% Enhancement of Carrier Mobility in Uniaxial-Oriented Perovskite Films Formed by Topotactic-Oriented Attachment. Advanced Materials, 29(23), [1606831]. https://doi.org/10.1002/adma.201606831