Publication date: 17th February 2025
Three-dimensional (3D) and two-dimensional (2D) halide perovskites have emerged as exceptional semiconducting materials over the past decade, renowned for their superior carrier lifetimes and structural versatility. However, a deeper understanding of the role of Pb²⁺ and Sn²⁺ ions, as well as the influence of organic spacers on the structure, properties, and performance of these materials, is critical for advancing their applications. In parallel, perovskitoids, a distinct but related class of materials, offer even greater structural and compositional diversity. Recent insights have illuminated how specific organic spacer cations can effectively stabilize various perovskitoid structures. We hypothesized that perovskitoids, with their robust organic-inorganic networks, could suppress ion migration in solar cells, thereby enhancing stability and performance.
By investigating perovskitoids across varying dimensionalities, we demonstrated that cation migration within perovskitoid-perovskite heterostructures is effectively suppressed, resulting in significantly improved long-term stability. Increased dimensionality in perovskitoids enhances charge transport, octahedral connectivity, and out-of-plane orientation. Notably, the 2D perovskitoids (Organic cation)₈Pb₇I₂₂ provide efficient surface passivation and enable the fabrication of uniform, large-area films. These properties have led to perovskite solar cells achieving a certified power conversion efficiency of 24.6% (Nature, 2024, 633, 359–364). This presentation will delve into the latest understanding of structure-property relationships in halide perovskites and perovskitoids, offering practical guidelines for selecting and incorporating organic spacers into crystalline materials and optoelectronic devices.
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Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
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The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.