1. Unveiling the Relationship between the Perovskite Precursor Solution and the Resulting Device Performance
- Author
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Min Gyu Kim, Byung-wook Park, Jincheol Kim, Sang Il Seok, Jan Seidel, Sean Lim, Anita Ho-Baillie, Tae Joo Shin, Jongho Baek, Simao Coelho, Hyoung-Woo Kwon, Hanul Min, Katharina Gaus, Shujuan Huang, Jae Sung Yun, and Martin A. Green
- Subjects
Fabrication ,Chemistry ,General Chemistry ,010402 general chemistry ,01 natural sciences ,7. Clean energy ,Biochemistry ,6. Clean water ,Catalysis ,0104 chemical sciences ,Colloid and Surface Chemistry ,Chemical engineering ,Transmission electron microscopy ,Solution process ,Perovskite (structure) - Abstract
For 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.
- Published
- 2020