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Unveiling the Relationship between the Perovskite Precursor Solution and the Resulting Device Performance
journal contribution
posted on 2020-03-17, 20:43 authored by Jincheol Kim, Byung-wook Park, Jongho Baek, Jae Sung Yun, Hyoung-Woo Kwon, Jan Seidel, Hanul Min, Simao Coelho, Sean Lim, Shujuan Huang, Katharina Gaus, Martin A. Green, Tae Joo Shin, Anita W. Y. Ho-baillie, Min Gyu Kim, Sang Il SeokFor
the fabrication of perovskite solar cells (PSCs) using a solution
process, it is essential to understand the characteristics of the
perovskite precursor solution to achieve high performance and reproducibility.
The colloids (iodoplumbates) in the perovskite precursors under various
conditions were investigated by UV–visible absorption, dynamic
light scattering, photoluminescence, and total internal reflection
fluorescence microscopy techniques. Their local structure was examined
by in situ X-ray absorption fine structure studies. Perovskite thin
films on a substrate with precursor solutions were characterized by
transmission electron microscopy, X-ray diffraction analysis, space-charge-limited
current, and Kelvin probe force microscopy. The colloidal properties
of the perovskite precursor solutions were found to be directly correlated
with the defect concentration and crystallinity of the perovskite
film. This work provides guidelines for controlling perovskite films
by varying the precursor solution, making it possible to use colloid-engineered
lead halide perovskite layers to fabricate efficient PSCs.
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Perovskite Precursor Solutionprecursor solutionsstructure studiesUVperovskite filmperovskite precursorsreflection fluorescence microscopy techniquesResulting Device PerformanceX-ray diffraction analysisperovskite precursor solutionsperovskite filmsKelvin probe force microscopyX-ray absorptiontransmission electron microscopydefect concentrationperovskite precursor solutionsolution processhalide perovskite layersPSCprecursor solutionuse colloid-engineered
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