Quantification of Ionic Diffusion in Lead Halide Perovskite Single Crystals
Type
ArticleKAUST Department
Functional Nanomaterials Lab (FuNL)KAUST Catalysis Center (KCC)
Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
Date
2018-05-25Online Publication Date
2018-05-25Print Publication Date
2018-07-13Permanent link to this record
http://hdl.handle.net/10754/627981
Metadata
Show full item recordAbstract
Lead halide perovskites are mixed electronic/ionic semiconductors that have recently revolutionized the photovoltaics field. The physical characterization of the ionic conductivity has been rather elusive due to the highly intermixing of ionic and electronic current. In this work the synthesis of low defect density monocrystalline MAPbBr3 (MA=Methyl ammonium) solar cells free of hole transport layer (HTL) suppresses the effect of electronic current. Impedance spectroscopy reveals the characteristic signature of ionic diffusion (the Warburg element and transmission line equivalent circuit) and ion accumulation at the MAPbBr3/Au interface. Diffusion coefficients are calculated based on a good correlation between thickness of MAPbBr3 and characteristic diffusion transition frequency. In addition, reactive external interfaces are studied by comparison of polycrystalline MAPbBr3 devices prepared either with or without a HTL. The low frequency response in IS measurements is correlated with the chemical reactivity of moving ions with the external interfaces and diffusion into the HTL.Citation
Peng W, Aranda C, Bakr OM, Garcia-Belmonte G, Bisquert J, et al. (2018) Quantification of Ionic Diffusion in Lead Halide Perovskite Single Crystals. ACS Energy Letters. Available: http://dx.doi.org/10.1021/acsenergylett.8b00641.Sponsors
We acknowledge funding from Spanish Ministerio de Economía y Competitividad of Spain under Project MAT2016-76892-C3-1-R and for a Ramón y Cajal Fellowship (RYC-2014-16809). OMB and WP acknowledge the financial support of KAUST.Publisher
American Chemical Society (ACS)Journal
ACS Energy LettersAdditional Links
https://pubs.acs.org/doi/10.1021/acsenergylett.8b00641ae974a485f413a2113503eed53cd6c53
10.1021/acsenergylett.8b00641