Cooling Mixed A-Site Halide Perovskites: Impact of Temperature on Optical and Structural Properties

IF 4.4 2区化学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

ACS Applied Polymer Materials Pub Date : 2024-09-26 DOI:10.1021/acs.chemmater.4c02026

Colette M. Sullivan, Jason E. Kuszynski, Alexey Kovalev, Nozomi Shirato, Volker Rose, Sarah Wieghold, Theo Siegrist, Richard D. Schaller, Geoffrey F. Strouse, Lea Nienhaus

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Abstract

The widespread utilization of perovskite-based photovoltaics requires probing both the structural and optical properties under extreme operating conditions to gain a holistic understanding of the material behavior under stressors. Here, we investigate the temperature-dependent behavior of mixed A-site cation lead triiodide perovskite thin films (85% methylammonium and 15% formamidinium) in the range from 300 to 20 K. Through a combination of optical and structural techniques, we find that the tetragonal-to-orthorhombic phase transition occurs at ∼110 K for this perovskite composition, as indicated by the change in the diffraction pattern. With decreasing temperature, the quantum yield increases with a concurrent elongation of the carrier lifetimes, indicating suppression of nonradiative recombination pathways. Interestingly, in contrast to single A-site cation perovskites, an additional optical transition appears in the absorption spectrum when the phase transition is approached, which is also reflected in the emission spectrum. We propose that the splitting of the optical absorption and emission is due to local segregation of the mixed cation perovskite during the phase transition.

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冷却混合 A 盐基卤化物包光体：温度对光学和结构特性的影响

要广泛应用基于透辉石的光伏技术，就必须同时探测极端工作条件下的结构和光学特性，以全面了解材料在应力作用下的行为。在此，我们研究了混合 A 位阳离子三碘化铅包晶石薄膜（85% 甲基铵和 15% 甲脒）在 300 至 20 K 范围内的温度依赖行为。通过结合光学和结构技术，我们发现这种包晶石成分在 ∼110 K 时发生了四方到正方的相变，衍射图样的变化表明了这一点。随着温度的降低，量子产率增加，同时载流子寿命延长，这表明非辐射重组途径受到抑制。有趣的是，与单 A 位阳离子包晶石不同的是，当相变接近时，吸收光谱中会出现一个额外的光学转变，这也反映在发射光谱中。我们认为，光学吸收和发射的分裂是由于相变过程中混合阳离子包晶的局部偏析造成的。

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来源期刊

ACS Applied Polymer Materials Multiple-

CiteScore

7.20

自引率

6.00%

发文量

810

期刊介绍： ACS Applied Polymer Materials is an interdisciplinary journal publishing original research covering all aspects of engineering, chemistry, physics, and biology relevant to applications of polymers. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrates fundamental knowledge in the areas of materials, engineering, physics, bioscience, polymer science and chemistry into important polymer applications. The journal is specifically interested in work that addresses relationships among structure, processing, morphology, chemistry, properties, and function as well as work that provide insights into mechanisms critical to the performance of the polymer for applications.