Double Charged Surface Layers in Lead Halide Perovskite Crystals

Smritakshi P. Sarmah; Victor M. Burlakov; Emre Yengel; Banavoth Murali; Erkki Alarousu; Ahmed M. El-Zohry; Chen Yang; Mohd S. Alias; Ayan A. Zhumekenov; Makhsud I. Saidaminov; Namchul Cho; Nimer Wehbe; Somak Mitra; Idris Ajia; Sukumar Dey; Ahmed E. Mansour; Maged Abdelsamie; Aram Amassian; Iman S. Roqan; Boon S. Ooi; Alain Goriely; Osman M. Bakr; Omar F. Mohammed

doi:10.1021/acs.nanolett.7b00031

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Double Charged Surface Layers in Lead Halide Perovskite Crystals

Journal article

Peer reviewed

Double Charged Surface Layers in Lead Halide Perovskite Crystals

Smritakshi P. Sarmah, Victor M. Burlakov, Emre Yengel, Banavoth Murali, Erkki Alarousu, Ahmed M. El-Zohry, Chen Yang, Mohd S. Alias, Ayan A. Zhumekenov, Makhsud I. Saidaminov, …

Nano letters, Vol.17(3), pp.2021-2027

08/03/2017

DOI: https://doi.org/10.1021/acs.nanolett.7b00031

PMID: 28145714

Abstract

Chemistry

Chemistry, Multidisciplinary

Chemistry, Physical

Materials Science

Materials Science, Multidisciplinary

Nanoscience & Nanotechnology

Physical Sciences

Physics

Physics, Applied

Physics, Condensed Matter

Science & Technology

Science & Technology - Other Topics

Technology

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.

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Title: Double Charged Surface Layers in Lead Halide Perovskite Crystals
Creators - without role: Smritakshi P. Sarmah - King Abdullah Univ Sci & Technol, Div Phys Sci & Engn, KAUST Solar Ctr, Thuwal 239556900, Saudi Arabia
Victor M. Burlakov - University of Oxford
Emre Yengel - King Abdullah Univ Sci & Technol, Div Phys Sci & Engn, KAUST Solar Ctr, Thuwal 239556900, Saudi Arabia
Banavoth Murali - King Abdullah Univ Sci & Technol, Div Phys Sci & Engn, KAUST Solar Ctr, Thuwal 239556900, Saudi Arabia
Erkki Alarousu - King Abdullah Univ Sci & Technol, Div Phys Sci & Engn, KAUST Solar Ctr, Thuwal 239556900, Saudi Arabia
Ahmed M. El-Zohry - King Abdullah Univ Sci & Technol, Div Phys Sci & Engn, KAUST Solar Ctr, Thuwal 239556900, Saudi Arabia
Chen Yang - King Abdullah Univ Sci & Technol, Div Phys Sci & Engn, KAUST Solar Ctr, Thuwal 239556900, Saudi Arabia
Mohd S. Alias - King Abdullah Univ Sci & Technol, Comp Elect & Math Sci & Engn Div, Photon Lab, Thuwal 239556900, Saudi Arabia
Ayan A. Zhumekenov - King Abdullah Univ Sci & Technol, Div Phys Sci & Engn, KAUST Solar Ctr, Thuwal 239556900, Saudi Arabia
Makhsud I. Saidaminov - King Abdullah Univ Sci & Technol, Div Phys Sci & Engn, KAUST Solar Ctr, Thuwal 239556900, Saudi Arabia
Namchul Cho - King Abdullah Univ Sci & Technol, Div Phys Sci & Engn, KAUST Solar Ctr, Thuwal 239556900, Saudi Arabia
Nimer Wehbe - King Abdullah Univ Sci & Technol, Imaging & Characterizat Lab, Thuwal 239556900, Saudi Arabia
Somak Mitra - King Abdullah Univ Sci & Technol, Mat Sci & Engn Div, Semicond & Mat Spect Lab, Thuwal 239556900, Saudi Arabia
Idris Ajia - King Abdullah Univ Sci & Technol, Mat Sci & Engn Div, Semicond & Mat Spect Lab, Thuwal 239556900, Saudi Arabia
Sukumar Dey - King Abdullah Univ Sci & Technol, Div Phys Sci & Engn, KAUST Solar Ctr, Thuwal 239556900, Saudi Arabia
Ahmed E. Mansour - King Abdullah Univ Sci & Technol, Div Phys Sci & Engn, KAUST Solar Ctr, Thuwal 239556900, Saudi Arabia
Maged Abdelsamie - King Abdullah Univ Sci & Technol, Div Phys Sci & Engn, KAUST Solar Ctr, Thuwal 239556900, Saudi Arabia
Aram Amassian - King Abdullah Univ Sci & Technol, Div Phys Sci & Engn, KAUST Solar Ctr, Thuwal 239556900, Saudi Arabia
Iman S. Roqan - King Abdullah Univ Sci & Technol, Mat Sci & Engn Div, Semicond & Mat Spect Lab, Thuwal 239556900, Saudi Arabia
Boon S. Ooi - King Abdullah Univ Sci & Technol, Comp Elect & Math Sci & Engn Div, Photon Lab, Thuwal 239556900, Saudi Arabia
Alain Goriely - University of Oxford
Osman M. Bakr - King Abdullah Univ Sci & Technol, Div Phys Sci & Engn, KAUST Solar Ctr, Thuwal 239556900, Saudi Arabia
Omar F. Mohammed - King Abdullah Univ Sci & Technol, Div Phys Sci & Engn, KAUST Solar Ctr, Thuwal 239556900, Saudi Arabia
Publication Details: Nano letters, Vol.17(3), pp.2021-2027
Publisher: Amer Chemical Soc
Number of pages: 7
Grant note: King Abdullah University of Science and Technology (KAUST); King Abdullah University of Science & Technology Technology Innovation Center for Solid-State Lighting at KAUST KACST
Identifiers: 9941007308331
Academic Unit: King Abdullah University of Science & Technology; King Fahd University of Petroleum & Minerals
Language: English
Resource Type: Journal article