Using small-angle scattering at the PTB X-ray beamline of BESSY II, an HZB team was able to experimentally investigate the colloidal chemistry of perovskite precursor solutions used for solar cell production. The results contribute to the targeted and systematic optimization of the manufacturing process and quality of these exciting semiconductor materials.
Halide perovskite semiconductors are inexpensive, versatile, and high-performance materials used in solar cells as well as optoelectronic devices. The crystalline perovskite thin films required for this purpose are prepared at low temperature from solution: While the solvent evaporates during an annealing step, highly coordinated iodoplumbates interact and subsequently form the polycrystalline thin film. The quality of the thin film ultimately determines the performance of the semiconductor material. Up to now, it has not been possible to achieve a comprehensive impression of the role of the colloidal chemistry in the precursor that is considered to be directional for crystallinity and the further processing.
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Image: Using Small-Angle Scattering the early stages of structure formation in precursor solutions of perovskite solar cells have been explored.
Credit: Image: © M. Flatken/HZB