Enhancing Perovskite Solar Cells Stability with Novel Quasi-Ohmic Contact Design

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The longevity and performance of perovskite solar cells (PSCs), essential for their commercial viability, are limited by the stability of their quasi-ohmic contacts, especially under elevated temperatures. Junsheng presents a pioneering approach to this challenge, introducing a polymer-acid-metal bilayer structure that forms a robust quasi-ohmic contact. This novel design employs a dopant-free semicrystalline polymer combined with a Lewis-acid layer, which is dissolved in alcohol for nondestructive solution processing. This method significantly enhances hole injection from the polymer into the metal, improving device stability and efficiency. Our PSCs demonstrate exceptional long-term photo-thermal-operational stability, maintaining high efficiency after extensive operational hours at varying temperatures in a nitrogen atmosphere. The simplicity, cost-effectiveness, and improved stability of this approach mark a significant advancement in PSC technology, offering a promising avenue towards overcoming the longevity challenges that hinder the commercialization of PSCs.

The results are published in the Nat Commun 15, 2002 (2024)