Bulk recrystallization for efficient mixed-cation mixed-halide perovskite solar cells

Liangyou Lin; Jacob Tse-Wei Wang; Timothy W. Jones; Mihaela Grigore; Andre Cook; Dane W. deQuilettes; Roberto Brenes; Benjamin C. Duck; Kenrick F. Anderson; Noel W. Duffy; Bernard Wenger; Vladimir Bulović; Jian Pu; Jian Li; Bo Chi; Henry J. Snaith; Gregory J. Wilson

doi:10.1039/C9TA08351K

Bulk recrystallization for efficient mixed-cation mixed-halide perovskite solar cells†

Liangyou Lin,‡^ab Jacob Tse-Wei Wang,

‡^a Timothy W. Jones,

^a Mihaela Grigore,

^c Andre Cook,

^a Dane W. deQuilettes,

^d Roberto Brenes,^d Benjamin C. Duck,

^a Kenrick F. Anderson,^a Noel W. Duffy,

^e Bernard Wenger,^f Vladimir Bulović,^d Jian Pu,^b Jian Li,

^b Bo Chi,

*^b Henry J. Snaith

^f and Gregory J. Wilson

*^a

Author affiliations

* Corresponding authors

^a CSIRO Energy, Newcastle Energy Centre, 10 Murray Dwyer Cct, Mayfield West, NSW 2304, Australia
E-mail: Greg.Wilson@csiro.au

^b Center for Fuel Cell Innovation, School of Materials Science and Engineering, Huazhong University of Science & Technology, Wuhan 430074, China
E-mail: chibo@hust.edu.cn

^c CSIRO Energy, 11 Julius Avenue, North Ryde 2113, Australia

^d Research Laboratory of Electronics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA

^e CSIRO Energy Clayton Laboratories, Clayton, Vic 3168, Australia

^f Clarendon Laboratory, University of Oxford, Parks Road, Oxford, UK

Abstract

Today, the use of mixed-cation lead mixed-halide perovskite with a slight excess of lead iodide (PbI₂) demonstrates the highest device performances in the literature. However, the presence of excess PbI₂ in the film poses long-term stability concerns. Here, we propose a facile bulk recrystallization process by applying formadinium chloride (FACl) on perovskite to remove excess PbI₂ in the formed crystal. We are able to demonstrate bulk recrystallization, proved and observed by the Grazing incidence XRD to analyze the crystal structure as a function of depth profiling. The reconstructed crystal displays improved optoelectronic qualities with reduced interfacial recombination as well as enhanced device stability. When measured under AM 1.5G spectral conditions the optimized champion device reached a maximum power conversion efficiency (PCE) of 20.2%.

Journal of Materials Chemistry A

Bulk recrystallization for efficient mixed-cation mixed-halide perovskite solar cells†

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Bulk recrystallization for efficient mixed-cation mixed-halide perovskite solar cells

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