Spin Coating: Process, Applications, Challenges, and Characterization Techniques

Spin coating is a thin film deposition technique that is widely used due to its simplicity, low cost, and efficiency in forming homogeneous layers. It is based on the centrifugation of liquid solutions on substrates and enables the controlled deposition of polymers, semiconductors, oxides, and nanoparticles. This versatility makes it indispensable for both research and industrial applications, particularly in the fields of microelectronics, sensors, optical devices, renewable energy, and biomedical engineering. In microelectronics, it is used in the production of insulating and conductive layers for integrated circuits and OLEDs. In sensor technology and optical devices, it ensures precision in the deposition of sensitive materials. In the field of renewable energies, it contributes to the production of thin-film solar cells. In biomedical engineering, it enables the development of bioactive coatings and systems for the controlled release of drugs. Spin coating is crucial in the production of electrolytes for fuel cells, which require highly conductive, defect-free thin films to optimize ion transport and energy efficiency. Materials such as YSZ, GDC, LSGM, LSCF and SDC are widely used and each offer advantages in terms of ionic conductivity, chemical stability, and thermal compatibility. The controlled deposition of these materials allows dense and uniform layers to be achieved, reducing energy losses, and increasing device life. Continuous research into optimizing the materials and parameters of spin coating underlines its importance for technological innovation and sustainable development, as its adaptability and precision ensure that it will continue to play a key role in the development of various fields of technology in the future.