Solvent coordination engineering for high-quality hybrid organic-inorganic perovskite films

• Published in: Journal of materials science Vol. 56; no. 16; pp. 9903 - 9913
• Main Authors: Zuo, Shouwei, Chu, Shengqi, An, Pengfei, Hu, Haiyang, Yin, Zi, Zheng, Lirong, Zhang, Jing
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.06.2021; Springer; Springer Nature B.V
• Subjects: Atomic structure; Characterization and Evaluation of Materials; Chemistry and Materials Science; Classical Mechanics; Coordination compounds; Crystallization; Crystallography and Scattering Methods; Diffraction; Dimethyl sulfoxide; Dimethylformamide; Energy Materials; Fine structure; iodides; lead; Materials Science; Morphology; Perovskite; Perovskites; Polymer Sciences; Precursors; Solid Mechanics; solvents; Spectrum analysis; ultraviolet-visible spectroscopy; X ray absorption; X-ray absorption spectroscopy; X-ray diffraction; X-rays
• DOI: 10.1007/s10853-021-05870-w
• ISSN: 0022-2461

Identifying the structure of iodoplumbate complexes in various solutions is essential for linking the coordination environment of the perovskite precursor to its final properties. In this study, we investigate the structure of methylammonium lead iodide (MAPbI 3 ) perovskite precursor solutions as a function of the volume ratio of N,N -dimethylformamide and dimethyl sulfoxide (DMSO) using X-ray absorption fine structure spectroscopy. It was demonstrated that DMSO modifies the precursor structure at the atomic level. X-ray diffraction, scanning electron microscopy, and UV–Vis spectroscopy analyses showed that the coordination environment of iodoplumbate complexes in precursor solutions is strongly correlated with the morphology of perovskite films. The appropriate amount of DMSO in the precursor solution modifies the Pb-O and Pb-I coordination of iodoplumbate complexes, which could change the growth process of high-crystallization perovskite films. This study sheds light on the formation mechanism of perovskite films from precursor solutions, which will lead to the development of high-quality films and ultimately high-efficiency devices.