Double Charged Surface Layers in Lead Halide Perovskite Crystals

Handle URI:
http://hdl.handle.net/10754/623824
Title:
Double Charged Surface Layers in Lead Halide Perovskite Crystals
Authors:
Sarmah, Smritakshi P.; Burlakov, Victor M.; Yengel, Emre ( 0000-0001-7208-4803 ) ; Banavoth, Murali ( 0000-0002-7806-2274 ) ; Alarousu, Erkki; El-Zohry, Ahmed M.; Yang, Chen; Alias, Mohd Sharizal ( 0000-0003-1369-1421 ) ; Zhumekenov, Ayan A.; Saidaminov, Makhsud I. ( 0000-0002-3850-666X ) ; Cho, Nam Chul; Wehbe, Nimer; Mitra, Somak; Ajia, Idris A. ( 0000-0003-3156-4426 ) ; Dey, Sukumar; Mansour, Ahmed ( 0000-0002-3411-6808 ) ; Abdelsamie, Maged ( 0000-0002-4631-5409 ) ; Amassian, Aram ( 0000-0002-5734-1194 ) ; Roqan, Iman S. ( 0000-0001-7442-4330 ) ; Ooi, Boon S. ( 0000-0001-9606-5578 ) ; Goriely, Alain; Bakr, Osman M. ( 0000-0002-3428-1002 ) ; Mohammed, Omar F. ( 0000-0001-8500-1130 )
Abstract:
Understanding defect chemistry, particularly ion migration, and its significant effect on the surface’s optical and electronic properties is one of the major challenges impeding the development of hybrid perovskite-based devices. Here, using both experimental and theoretical approaches, we demonstrated that the surface layers of the perovskite crystals may acquire a high concentration of positively charged vacancies with the complementary negatively charged halide ions pushed to the surface. This charge separation near the surface generates an electric field that can induce an increase of optical band gap in the surface layers relative to the bulk. We found that the charge separation, electric field, and the amplitude of shift in the bandgap strongly depend on the halides and organic moieties of perovskite crystals. Our findings reveal the peculiarity of surface effects that are currently limiting the applications of perovskite crystals and more importantly explain their origins, thus enabling viable surface passivation strategies to remediate them.
KAUST Department:
Physical Sciences and Engineering (PSE) Division; Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division; Photonics Laboratory; Imaging and Characterization Core Lab; Materials Science and Engineering Program
Citation:
Sarmah SP, Burlakov VM, Yengel E, Murali B, Alarousu E, et al. (2017) Double Charged Surface Layers in Lead Halide Perovskite Crystals. Nano Letters 17: 2021–2027. Available: http://dx.doi.org/10.1021/acs.nanolett.7b00031.
Publisher:
American Chemical Society (ACS)
Journal:
Nano Letters
Issue Date:
1-Feb-2017
DOI:
10.1021/acs.nanolett.7b00031
Type:
Article
ISSN:
1530-6984; 1530-6992
Sponsors:
King Abdullah University of Science and Technology (KAUST) supported the work reported here. The authors gratefully acknowledge funding support from KACST, Technology Innovation Center for Solid-State Lighting at KAUST.
Additional Links:
http://pubs.acs.org/doi/abs/10.1021/acs.nanolett.7b00031
Appears in Collections:
Articles; Advanced Nanofabrication, Imaging and Characterization Core Lab; Physical Sciences and Engineering (PSE) Division; Materials Science and Engineering Program; Photonics Laboratory; Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorSarmah, Smritakshi P.en
dc.contributor.authorBurlakov, Victor M.en
dc.contributor.authorYengel, Emreen
dc.contributor.authorBanavoth, Muralien
dc.contributor.authorAlarousu, Erkkien
dc.contributor.authorEl-Zohry, Ahmed M.en
dc.contributor.authorYang, Chenen
dc.contributor.authorAlias, Mohd Sharizalen
dc.contributor.authorZhumekenov, Ayan A.en
dc.contributor.authorSaidaminov, Makhsud I.en
dc.contributor.authorCho, Nam Chulen
dc.contributor.authorWehbe, Nimeren
dc.contributor.authorMitra, Somaken
dc.contributor.authorAjia, Idris A.en
dc.contributor.authorDey, Sukumaren
dc.contributor.authorMansour, Ahmeden
dc.contributor.authorAbdelsamie, Mageden
dc.contributor.authorAmassian, Aramen
dc.contributor.authorRoqan, Iman S.en
dc.contributor.authorOoi, Boon S.en
dc.contributor.authorGoriely, Alainen
dc.contributor.authorBakr, Osman M.en
dc.contributor.authorMohammed, Omar F.en
dc.date.accessioned2017-05-31T11:23:07Z-
dc.date.available2017-05-31T11:23:07Z-
dc.date.issued2017-02-01en
dc.identifier.citationSarmah SP, Burlakov VM, Yengel E, Murali B, Alarousu E, et al. (2017) Double Charged Surface Layers in Lead Halide Perovskite Crystals. Nano Letters 17: 2021–2027. Available: http://dx.doi.org/10.1021/acs.nanolett.7b00031.en
dc.identifier.issn1530-6984en
dc.identifier.issn1530-6992en
dc.identifier.doi10.1021/acs.nanolett.7b00031en
dc.identifier.urihttp://hdl.handle.net/10754/623824-
dc.description.abstractUnderstanding defect chemistry, particularly ion migration, and its significant effect on the surface’s optical and electronic properties is one of the major challenges impeding the development of hybrid perovskite-based devices. Here, using both experimental and theoretical approaches, we demonstrated that the surface layers of the perovskite crystals may acquire a high concentration of positively charged vacancies with the complementary negatively charged halide ions pushed to the surface. This charge separation near the surface generates an electric field that can induce an increase of optical band gap in the surface layers relative to the bulk. We found that the charge separation, electric field, and the amplitude of shift in the bandgap strongly depend on the halides and organic moieties of perovskite crystals. Our findings reveal the peculiarity of surface effects that are currently limiting the applications of perovskite crystals and more importantly explain their origins, thus enabling viable surface passivation strategies to remediate them.en
dc.description.sponsorshipKing Abdullah University of Science and Technology (KAUST) supported the work reported here. The authors gratefully acknowledge funding support from KACST, Technology Innovation Center for Solid-State Lighting at KAUST.en
dc.publisherAmerican Chemical Society (ACS)en
dc.relation.urlhttp://pubs.acs.org/doi/abs/10.1021/acs.nanolett.7b00031en
dc.subjectdefectsen
dc.subjection migrationen
dc.subjectlead halide perovskite crystalen
dc.subjectNanometer surface layersen
dc.subjectone vs two-photon excitationen
dc.titleDouble Charged Surface Layers in Lead Halide Perovskite Crystalsen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Divisionen
dc.contributor.departmentPhotonics Laboratoryen
dc.contributor.departmentImaging and Characterization Core Laben
dc.contributor.departmentMaterials Science and Engineering Programen
dc.identifier.journalNano Lettersen
dc.contributor.institutionMathematical Institute, University of Oxford, Woodstock Road, Oxford, OX2 6GG, , United Kingdomen
dc.contributor.institutionSchool of Chemistry, University of Hyderabad, Hyderabad, 500046, , Indiaen
dc.contributor.institutionDepartment of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, M5S 3G4, , Canadaen
kaust.authorSarmah, Smritakshi P.en
kaust.authorYengel, Emreen
kaust.authorBanavoth, Muralien
kaust.authorAlarousu, Erkkien
kaust.authorEl-Zohry, Ahmed M.en
kaust.authorYang, Chenen
kaust.authorAlias, Mohd Sharizalen
kaust.authorZhumekenov, Ayan A.en
kaust.authorSaidaminov, Makhsud I.en
kaust.authorCho, Nam Chulen
kaust.authorWehbe, Nimeren
kaust.authorMitra, Somaken
kaust.authorAjia, Idris A.en
kaust.authorDey, Sukumaren
kaust.authorMansour, Ahmeden
kaust.authorAbdelsamie, Mageden
kaust.authorAmassian, Aramen
kaust.authorRoqan, Iman S.en
kaust.authorOoi, Boon S.en
kaust.authorBakr, Osman M.en
kaust.authorMohammed, Omar F.en
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