DOI: 10.1016/j.scib.2020.06.018
论文题名: Ultrasensitive polarized-light photodetectors based on 2D hybrid perovskite ferroelectric crystals with a low detection limit
作者: Wang J. ; Liu Y. ; Han S. ; Ma Y. ; Li Y. ; Xu Z. ; Luo J. ; Hong M. ; Sun Z.
刊名: Science Bulletin
ISSN: 20959273
出版年: 2021
卷: 66, 期: 2 起始页码: 158
结束页码: 163
语种: 英语
中文关键词: Ferroelectric
; Hybrid perovskite
; Low detection limit
; Polarized-light detection
英文关键词: Crystals
; Electric fields
; Ferroelectricity
; Light polarization
; Perovskite
; Photodetectors
; Photons
; Built-in electric fields
; Ferroelectric crystal
; Low detection limit
; Specific detectivity
; Spontaneous polarizations
; Structural motifs
; Two Dimensional (2 D)
; Ultra sensitives
; Ferroelectric materials
英文摘要: Polarized-light photodetectors are the indispensable elements for practical optical and optoelectronic device applications. Two-dimensional (2D) hybrid perovskite ferroelectrics, in which the coupling of spontaneous polarization (Ps) and light favors the dissociation of photo-induced carriers, have taken a booming position within this portfolio. However, polarized-light photodetectors with a low detection-limit remain unexplored in this 2D ferroelectric family. In this work, the high-quality individual crystals of a 2D perovskite ferroelectric, BA2CsPb2Br7 (1, where BA+ is n-butylammonium), were used to fabricate ultrasensitive polarized-light detectors. Its unique bilayered structural motif results in quite strong electric and optical anisotropy with a large absorption ratio of αc/αa ≈ 3.2 (λ = 405 nm). Besides, the presence of ferroelectric Ps also endows high built-in electric field along the polar c-axis that favors photoelectric activities. Under an extremely low detectable limit of 40 nW/cm2, the detector of 1 exhibits a notable dichroism ratio (Iphc/Ipha ≈ 1.5), a large responsivity of ~39.5 mA/W and a specific detectivity of ~1.2 × 1012 Jones. Moreover, crystal-based devices of 1 also exhibit a fast response speed (~300 μs) and excellent anti-fatigue merits. This work highlights great potentials of hybrid perovskite ferroelectrics toward polarized-light photodetection. © 2020 Science China Press Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170422
Appears in Collections: 气候变化与战略
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作者单位: College of Chemistry, Fuzhou University, Fuzhou, 350116, China; State Key Laboratory of Structure Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, China
Recommended Citation:
Wang J.,Liu Y.,Han S.,et al. Ultrasensitive polarized-light photodetectors based on 2D hybrid perovskite ferroelectric crystals with a low detection limit[J]. Science Bulletin,2021-01-01,66(2)