Department of Chemistry, Indian Institute of Science Education and Research (IISER), Pune, 411008, India.
Department of Physics, Indian Institute of Science Education and Research (IISER), Bhopal, 462066, India.
Angew Chem Int Ed Engl. 2017 Nov 6;56(45):14187-14191. doi: 10.1002/anie.201709040. Epub 2017 Oct 9.
Herein we report the colloidal synthesis of Cs Sb I and Rb Sb I perovskite nanocrystals, and explore their potential for optoelectronic applications. Different morphologies, such as nanoplatelets and nanorods of Cs Sb I , and spherical Rb Sb I nanocrystals were prepared. All these samples show band-edge emissions in the yellow-red region. Exciton many-body interactions studied by femtosecond transient absorption spectroscopy of Cs Sb I nanorods reveals characteristic second-derivative-type spectral features, suggesting red-shifted excitons by as much as 79 meV. A high absorption cross-section of ca. 10 cm was estimated. The results suggest that colloidal Cs Sb I and Rb Sb I nanocrystals are potential candidates for optical and optoelectronic applications in the visible region, though a better control of defect chemistry is required for efficient applications.
在此，我们报告了 CsSbI 和 RbSbI 钙钛矿纳米晶体的胶体合成，并探索了它们在光电应用方面的潜力。我们制备了不同形貌的 CsSbI，如纳米薄片和纳米棒，以及球形的 RbSbI 纳米晶体。所有这些样品都在黄-红区域显示出带边发射。通过飞秒瞬态吸收光谱研究 CsSbI 纳米棒中的激子多体相互作用，揭示了具有特征二阶导数型光谱特征，表明激子红移高达 79meV。估计其吸收截面高达约 10cm。结果表明，胶体 CsSbI 和 RbSbI 纳米晶体是可见光区域中光学和光电应用的潜在候选材料，尽管需要更好地控制缺陷化学以实现高效应用。
