Dupé Sarah, Liu Dongyu, Ghosh Antik, Vasenko Andrey S, Pouget Stéphanie, Schlutig Sandrine, Vidal Mathieu, Lebeau Bénédicte, Ling Wai Li, Reiss Peter, Prezhdo Oleg V, Ryzhikov Andrey, Aldakov Dmitry
Univ. Grenoble Alpes, CNRS, CEA, INP, IRIG/SyMMES, STEP, 38000 Grenoble, France.
International Research Center for Renewable Energy (IRCRE), State Key Laboratory of Multiphase Flow in Power Engineering (MFPE), Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China.
Nanoscale. 2024 Jun 13;16(23):11223-11231. doi: 10.1039/d4nr00430b.
Bismuth iodide perovskite nanocrystals are considered a viable alternative to the Pb halide ones due to their reduced toxicity and increased stability. However, it is still challenging to fabricate nanocrystals with a small and controlled size, and their electronic properties are not well understood. Here, we propose the growth of Bi iodide perovskite nanocrystals using different mesoporous silica with ordered pores of controlled diameter as templates. We obtain a series of confined CsBiI and MABiI perovskites with diameters of 2.3, 3.7, 7.4, and 9.2 nm, and precise size control. The complex absorption spectra of the encapsulated perovskites cannot be properly fitted using classical Tauc or Elliott formalisms. By fitting the spectra with a modified Elliott formula, the bandgap values and exciton binding energies (70-400 meV) could be extracted. The calculated bandgaps scale with the pore sizes. Using a combined experimental and theoretical approach, we demonstrate for the first time quantum confinement in 0D Bi-iodide perovskite nanocrystals.
