Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
Publication date: 11th July 2022
Perovskite solar cells (PSCs) have shown excellent performance in the last decade. However, most of the involved solvents in their processing are toxic, which limits their further development. Here, we fabricated PSCs in an entirely green solvent system. We used water, dimethyl sulfoxide (DMSO), and anisole as the solvents of SnO2, perovskite precursor, and Spiro-OMeTAD. Moreover, we introduced a new green antisolvent as an efficient replacement for the common toxic antisolvents such as chlorobenzene and toluene. Our characterization demonstrated better electronic interaction of our new antisolvent with dimethyl sulfoxide (DMSO) as the perovskite precursor’s solvent, leading to a stable intermediate phase and excellent perovskite crystallization with reduced defect density. As a result, we achieved 21.6% power conversion efficiency MAPbI3 PSCs, which to the best of our knowledge, is the highest reported efficiency for fully green solvent-procced PSCs. This work provides a critical study for a better understanding of perovskite crystallization.
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