Behera Rakesh Kumar, Banerjee Souvik, Kharbanda Nitika, Sachdeva Manvi, Nasipuri Diptam, Ghosh Hirendra N, Pradhan Narayan
School of Materials Sciences, Indian Association for the Cultivation of Science, Kolkata 700032, India.
School of Chemical Sciences, National Institute of Science Education and Research, Bhubaneswar, Odisha 752050, India.
J Am Chem Soc. 2024 Nov 13;146(45):31177-31185. doi: 10.1021/jacs.4c11172. Epub 2024 Nov 3.
Lead halide perovskite and chalcogenide heterostructures which share the ionic and covalent interface bonding may be the possible materials in bringing phase stability to these emerging perovskite nanocrystals. However, in spite of significant successes in the development of halide perovskite nanocrystals, their epitaxial heterostructures with appropriate chalcogenide nanomaterials have largely remained unexplored. Keeping the importance of these materials in mind, herein, epitaxial nanocrystal heterostructures of CsPbBr-PbSe are reported. The shape remained rhombic dodecahedral-tetrahedral, and the phase retained orthorhombic-cubic for CsPbBr and PbSe nanocrystals, respectively. These are synthesized following the standard classical approach of heteronucleations of chalcogenide PbSe with CsPbBr perovskite nanostructures and characterized with high-resolution electron microscopic imaging. With an ultrafast study, the hot charge transfer from CsPbBr to PbSe is also established. As these are first of its kind nanostructures which are obtained with heteronucleation and growth of chalcogenides on halide perovskites, this finding is expected to open the roadmap for designing other heterostructures which are important for catalysis and photovoltaic applications.
具有离子和共价界面键合的卤化铅钙钛矿与硫族化物异质结构可能是使这些新兴钙钛矿纳米晶体具有相稳定性的潜在材料。然而，尽管卤化铅钙钛矿纳米晶体的开发取得了显著成功，但其与合适的硫族化物纳米材料形成的外延异质结构在很大程度上仍未得到探索。考虑到这些材料的重要性，本文报道了CsPbBr-PbSe外延纳米晶体异质结构。CsPbBr和PbSe纳米晶体的形状分别保持菱形十二面体-四面体，相分别保持正交晶系-立方晶系。它们是按照硫族化物PbSe与CsPbBr钙钛矿纳米结构异质成核的标准经典方法合成的，并通过高分辨率电子显微镜成像进行了表征。通过超快研究，还确定了从CsPbBr到PbSe的热电荷转移。由于这些是通过卤化钙钛矿上硫族化物的异质成核和生长获得的首批此类纳米结构，这一发现有望为设计对催化和光伏应用很重要的其他异质结构开辟道路。
