Shining Light on Metal Halide Perovskite Stability with Nanoscale Optical Characterization

通过纳米级光学表征揭示金属卤化物钙钛矿的稳定性

• 批准号: EP/X014673/1
• 负责人: Rebecca Milot
• 金额: $ 271.6万
• 依托单位: University of Warwick
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FX014673%2F1
• 关键词: Shining; Light; Metal; Halide; Perovskite

Mitigating the detrimental effects of climate change will require technological advances in renewable energy. In the last decade, hybrid metal halide perovskite thin films have shown increasing success as active layers in solar cells, demonstrating power conversion efficiencies rivaling those of silicon. Despite these successes, issues with stability and concerns about toxicity have kept these materials from widespread commercialization. At the center of both issues is the polycrystalline microstructure inherent to these films, which introduces heterogeneity in optoelectronic properties and energy landscape and can limit charge transport and efficiency. However, identifying routes for improvement is difficult because measurements of bulk optoelectronic properties cannot adequately probe this heterogeneity. A need therefore exists for optoelectronic studies on the nanoscale to fully understand the relationship between microstructure, stability, and charge transport. This project will address these issues by pioneering the combined use of THz and photoluminescence (PL) scattering near-field microscopy (SNOM) to map static and dynamic optoelectronic properties at the nanoscale. This project will specifically focus on mixed-halide and mixed lead-tin materials for the use in tandem solar cells as they are central to both the stability concerns and the commercial efforts of the field. Through comparison with traditional microscopy and ultrafast spectroscopy measurements, THz/PL-SNOM measurements will unravel the mechanisms whereby both intrinsic and extrinsic factors affect optoelectronic performance. By analyzing methods employed to improve stability including passivation and A-site cation mixing, this project will provide a roadmap for the materials engineering of stable and efficient perovskite thin films.

减轻气候变化的不利影响需要可再生能源的技术进步。在过去的十年中，混合金属卤化物钙钛矿薄膜作为太阳能电池的活性层越来越成功，其电力转换效率可与硅相媲美。尽管取得了这些成功，但稳定性问题和毒性问题使这些材料无法广泛商业化。这两个问题的核心是这些薄膜固有的多晶微观结构，它引入了光电特性和能量景观的异质性，并可能限制电荷传输和效率。然而，确定改进途径很困难，因为体光电特性的测量无法充分探测这种异质性。因此，需要进行纳米尺度的光电研究，以充分了解微观结构、稳定性和电荷传输之间的关系。该项目将通过开创性地结合使用太赫兹和光致发光（PL）散射近场显微镜（SNOM）来绘制纳米尺度的静态和动态光电特性来解决这些问题。该项目将特别关注用于串联太阳能电池的混合卤化物和混合铅锡材料，因为它们是该领域稳定性问题和商业努力的核心。通过与传统显微镜和超快光谱测量进行比较，THz/PL-SNOM 测量将揭示内在和外在因素影响光电性能的机制。通过分析用于提高稳定性的方法，包括钝化和 A 位阳离子混合，该项目将为稳定高效的钙钛矿薄膜的材料工程提供路线图。