Ultrasensitive polarized-light photodetectors based on 2D hybrid perovskite ferroelectric crystals with a low detection limit - Details

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Abstract：

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

Keyword：

Ferroelectric; Hybrid perovskite; Low detection limit; Polarized-light detection

Community：

[ 1 ] [Wang, J.]College of Chemistry, Fuzhou University, Fuzhou, 350116, China
[ 2 ] [Wang, J.]State Key Laboratory of Structure Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, China
[ 3 ] [Liu, Y.]State Key Laboratory of Structure Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, China
[ 4 ] [Han, S.]State Key Laboratory of Structure Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, China
[ 5 ] [Ma, Y.]State Key Laboratory of Structure Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, China
[ 6 ] [Li, Y.]State Key Laboratory of Structure Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, China
[ 7 ] [Xu, Z.]College of Chemistry, Fuzhou University, Fuzhou, 350116, China
[ 8 ] [Xu, Z.]State Key Laboratory of Structure Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, China
[ 9 ] [Luo, J.]State Key Laboratory of Structure Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, China
[ 10 ] [Hong, M.]State Key Laboratory of Structure Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, China
[ 11 ] [Sun, Z.]College of Chemistry, Fuzhou University, Fuzhou, 350116, China
[ 12 ] [Sun, Z.]State Key Laboratory of Structure Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, China

Reprint 's Address：

[Sun, Z.]College of Chemistry, Fuzhou UniversityChina

Email：

sunzhihua@fjirsm.ac.cn

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Source ：

Science Bulletin

ISSN： 2095-9273

Year： 2020

1 1 . 7 8

JCR@2020

1 8 . 8 0 0

JCR@2023

ESI HC Threshold：420

JCR Journal Grade：1

CAS Journal Grade：1

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ESI Highly Cited Papers on the List： 0 Unfold All

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30 Days PV： 1

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