Background
Unmodified perovskite inks designed for conventional solution processing based on spin coating typically produce pinholed, uneven, and shunted films when processed in air or with scalable processing methods. Novel polymeric modifiers have recently been used to improve film uniformity and density. These additives act as rheological modifiers by increasing ink viscosity, thus allowing longer periods for crystallization and smooth films. The long chains of the polymer also create an organizational scaffold that increases resistance to humidity. In recent years, additives from the food industry, such as corn starch, have been found to enhance mechanical integrity and the operational lifetime of devices. These additives also have been found to induce spherulitic domains that can be tuned in size by temperature and precursor concentration to increase performance.
Invention Description
Researchers at Arizona State University have developed a novel method for scalable open-air flame processing of in-line thin film photovoltaic manufacturing using a gum-based polymer additive in a semiconducting halide perovskite ink. The additive is made from nontoxic starch and gum-based materials from the food industry, which improves the printability and processability of the ink to be compatible with rapid high-temperature processing. The use of a nontoxic solvent system further extends the wetting period, thus improving crystallization control. This invention also incorporates a high-temperature flame discharge to rapidly crystallize the perovskite, and the use of the additive enables the ability to adapt these rapid process conditions.
Potential Applications
Solar cell manufacturing for applications in:
Benefits and Advantages
Related Publication: Rapid Open-Air Fabrication of Perovskite Solar Modules.