Publication date: 17th February 2025
The increasing demand for sustainable energy solutions has fueled significant progress in perovskite solar cells (PSCs), a promising photovoltaic technology with efficiencies exceeding 25%. Despite these advancements, achieving long-term operational stability and optimal device performance remains a critical challenge. This study focuses on both crystal growth control and interface passivation as dual strategies to address these challenges. First, the crystal growth mechanisms of hybrid halide perovskites were explored, with an emphasis on reducing charge recombination at grain boundaries and achieving controlled grain size distribution and large-area uniformity with enhanced crystallinity. By incorporating functional organic additives, the structural and optoelectronic properties of perovskite films were significantly enhanced, leading to improved device efficiency and stability. In addition to optimizing the perovskite layer, interfacial engineering played a pivotal role in this study. The tailored buffer materials, specifically bathocuproine (BCP) derivatives, were employed in the p-i-n PSC architecture to overcome instability of BCP. Modifying the functional groups of BCP improved molecular planarity, charge transport, and device durability. These optimized derivatives reduced recombination losses and extended device lifetimes, highlighting their importance in advancing PSC performance. This comprehensive approach, combining crystal growth control and interface passivation, demonstrates a pathway for achieving high-efficiency and stable PSCs, offering valuable insights for the commercialization of next-generation photovoltaic technologies.
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