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    Ultralow Self-Doping in 2D Hybrid Perovskite Single Crystals

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    Type
    Article
    Authors
    Peng, Wei cc
    Yin, Jun cc
    Ho, Kang-Ting cc
    Ouellette, Olivier cc
    de Bastiani, Michele
    Banavoth, Murali cc
    El Tall, Omar
    Shen, Chao cc
    Miao, Xiaohe
    Pan, Jun cc
    Alarousu, Erkki
    He, Jr-Hau cc
    Ooi, Boon S. cc
    Mohammed, Omar F. cc
    Sargent, Edward H. cc
    Bakr, Osman cc
    KAUST Department
    Analytical Chemistry Core Lab
    Chemical Science Program
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Electrical Engineering Program
    Functional Nanomaterials Lab (FuNL)
    Imaging and Characterization Core Lab
    KAUST Catalysis Center (KCC)
    KAUST Solar Center (KSC)
    Material Science and Engineering Program
    Nano Energy Lab
    Photonics Laboratory
    Physical Characterization
    Physical Science and Engineering (PSE) Division
    Solids
    Ultrafast Laser Spectroscopy and Four-dimensional Electron Imaging Research Group
    Date
    2017-06-28
    Online Publication Date
    2017-06-28
    Print Publication Date
    2017-08-09
    Permanent link to this record
    http://hdl.handle.net/10754/625170
    
    Metadata
    Show full item record
    Abstract
    Unintentional self-doping in semiconductors through shallow defects is detrimental to optoelectronic device performance. It adversely affects junction properties and it introduces electronic noise. This is especially acute for solution-processed semiconductors, including hybrid perovskites, which are usually high in defects due to rapid crystallization. Here, we uncover extremely low self-doping concentrations in single crystals of (C6H5C2H4NH3)2PbI4・(CH3NH3PbI3)n-1 (n=1, 2, and 3)—over three orders of magnitude lower than those of typical three-dimensional hybrid perovskites—by analyzing their conductivity behavior. We propose that crystallization of hybrid perovskites containing large organic cations suppresses defect formation and thus favors a low self-doping level. To exemplify the benefits of this effect, we demonstrate extraordinarily high light-detectivity (1013 Jones) in (C6H5C2H4NH3)2PbI4・(CH3NH3PbI3)n-1 photoconductors due to the reduced electronic noise, which makes them particularly attractive for the detection of weak light signals. Furthermore, the low self-doping concentration reduces the equilibrium charge carrier concentration in (C6H5C2H4NH3)2PbI4・(CH3NH3PbI3)n-1, advantageous in the design of p-i-n heterojunction solar cells by optimizing band alignment and promoting carrier depletion in the intrinsic perovskite layer, thereby enhancing charge extraction.
    Citation
    Peng W, Yin J, Ho K-T, Ouellette O, De Bastiani M, et al. (2017) Ultralow Self-Doping in 2D Hybrid Perovskite Single Crystals. Nano Letters. Available: http://dx.doi.org/10.1021/acs.nanolett.7b01475.
    Sponsors
    Financial support for this work was provided by KAUST. W.P. would like to acknowledge Chun Ma at KAUST for his valuable suggestions on the measurement of photodetector noise, Feng Li and Ting-You Li at KAUST for their assistance in measuring temperature-dependent conductivity.
    Publisher
    American Chemical Society (ACS)
    Journal
    Nano Letters
    DOI
    10.1021/acs.nanolett.7b01475
    PubMed ID
    28657752
    Additional Links
    http://pubs.acs.org/doi/abs/10.1021/acs.nanolett.7b01475
    ae974a485f413a2113503eed53cd6c53
    10.1021/acs.nanolett.7b01475
    Scopus Count
    Collections
    Articles; Analytical Chemistry Core Lab; Imaging and Characterization Core Lab; Physical Science and Engineering (PSE) Division; Electrical and Computer Engineering Program; Chemical Science Program; Material Science and Engineering Program; Photonics Laboratory; KAUST Catalysis Center (KCC); KAUST Solar Center (KSC); Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

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