Double-Side Crystallization Tuning to Achieve over 1 μm Thick and Well-Aligned Block-Like Narrow-Bandgap Perovskites for High-Efficiency Near-Infrared Photodetectors

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Hui Liu
  • Hugh Lu Zhu
  • Zishuai Wang
  • Xiao Wu
  • Zhanfeng Huang
  • Xinhui Lu
  • Wallace C. H. Choy

Detail(s)

Original languageEnglish
Article number2010532
Journal / PublicationAdvanced Functional Materials
Volume31
Issue number28
Online published29 Apr 2021
Publication statusPublished - 9 Jul 2021

Abstract

Solution-processed narrow-bandgap Sn-Pb perovskites have shown their potential in near-infrared (NIR) photodetection as a promising alternative to traditional silicon and inorganic compounds. To achieve efficient NIR photodetection, high-quality Sn-Pb perovskite thick films with well-packed, smooth, and pinhole/void-free features are highly desirable for boosting the spectral absorption. Understanding the crystallization kinetics and tuning the crystallization are fundamentally important to reach such high-quality thick Sn-Pb perovskite films, and have been limitedly explored. Herein, an approach of double-side crystallization tuning through low-temperature space-restricted annealing in methylammonium-free Sn-Pb perovskite films with over 1 μm thickness is proposed. More specifically, through simultaneously retarding the crystallization in the top of precursor films and promoting the crystal growth of the bottom of precursor films, high-quality and block-like thick FA0.85Cs0.15Sn0.5Pb0.5I3 perovskite films with improved crystallinity, preferred out-of-plane orientation, and reduced trap density are achieved. Finally, photovoltaic-mode Sn-Pb perovskite NIR photodetectors show a high external quantum efficiency of ≈80% at 760-900 nm, a recorded responsivity of 0.53 A W-1, and a high specific detectivity of 6 x 1012 Jones at 940 nm. This study offers the fundamental understanding of the crystallization kinetics of thick perovskite films and paves the way for perovskite-based emerging NIR photodetection and imaging applications.

Research Area(s)

  • low-temperature space-restricted crystallization, near-infrared photodetectors, Sn–Pb perovskites, thick perovskites

Citation Format(s)

Double-Side Crystallization Tuning to Achieve over 1 μm Thick and Well-Aligned Block-Like Narrow-Bandgap Perovskites for High-Efficiency Near-Infrared Photodetectors. / Liu, Hui; Zhu, Hugh Lu; Wang, Zishuai; Wu, Xiao; Huang, Zhanfeng; Huqe, Md Rashedul; Zapien, Juan Antonio; Lu, Xinhui; Choy, Wallace C. H.

In: Advanced Functional Materials, Vol. 31, No. 28, 2010532, 09.07.2021.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review