Organic-inorganic hybrid perovskites are considered ideal candidates for future photovoltaic applications due to their excellent photovoltaic properties. Although solution-printed fabrication has shown inherent potential for low-cost, high-throughput production of thin-film semiconductor electronics, high-quality and reproducible deposition of large-area perovskites due to the droplet coffee ring effect (CRE) remains a limitation. Bottlenecks in commercialization.
Chen Yiwang and Meng Xiangchuan of Jiangxi Normal University solved these problems by introducing an in-situ polymer framework. The three-dimensional skeleton formed by spontaneous cross-linking increases the viscosity of the precursor, homogenizes its thermal diffusion coefficient, offsets the lateral capillary flow of colloidal particles, and anchors their flocculent motion.
Therefore, the Marangoni convection intensity is properly controlled to ensure high-quality perovskite films, which significantly improves the reproducibility of printed high-efficiency photovoltaic cells by mitigating CRE. Subsequently, perovskite solar cells and modules achieved power conversion efficiencies of 23.94% and 17.53%, and demonstrated positive environmental stability, maintaining efficiencies of over 90% and 78% after 2500 and 1600 hours of storage, respectively. This work can serve as a basis for exploring precursor rheology to meet uniform deposition requirements for perovskite photovoltaics and facilitate progress in their transition to printed fabrication and commercialization.
L. Li, Z. Huang, X. Meng, Z. Xing, B. Fan, J. Li, Y. Chen, In-situ Polymer Framework Strategy Enabling Printable And Efficient Perovskite Solar Cells by Mitigating “Coffee Ring” Effect. Adv . Mater. 2024, 2310752.
DOI: 10.1002/adma.202310752
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