Sheikh Tariq, Nawale Vaibhav, Pathoor Nithin, Phadnis Chinmay, Chowdhury Arindam, Nag Angshuman
Department of Chemistry, Indian Institute of Science Education and Research (IISER), Pune, 411008, India.
Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, India.
Angew Chem Int Ed Engl. 2020 Jul 6;59(28):11653-11659. doi: 10.1002/anie.202003509. Epub 2020 May 4.
In layered hybrid perovskites, such as (BA) PbI (BA=C H NH ), electrons and holes are considered to be confined in atomically thin two dimensional (2D) Pb-I inorganic layers. These inorganic layers are electronically isolated from each other in the third dimension by the insulating organic layers. Herein we report our experimental findings that suggest the presence of electronic interaction between the inorganic layers in some parts of the single crystals. The extent of this interaction is reversibly tuned by intercalation of organic and inorganic molecules in the layered perovskite single crystals. Consequently, optical absorption and emission properties switch reversibly with intercalation. Furthermore, increasing the distance between inorganic layers by increasing the length of the organic spacer cations systematically decreases these electronic interactions. This finding that the parts of the layered hybrid perovskites are not strictly electronically 2D is critical for understanding the electronic, optical, and optoelectronic properties of these technologically important materials.
在层状杂化钙钛矿中，例如（BA）PbI（BA = C₂H₅NH₂），电子和空穴被认为局限于原子级薄的二维（2D）Pb - I无机层中。这些无机层在第三维中通过绝缘有机层彼此电隔离。在此，我们报告我们的实验结果，这些结果表明在单晶的某些部分中无机层之间存在电子相互作用。这种相互作用的程度可通过在层状钙钛矿单晶中插入有机和无机分子来可逆地调节。因此，光吸收和发射特性随插入而可逆地切换。此外，通过增加有机间隔阳离子的长度来增加无机层之间的距离会系统地降低这些电子相互作用。这一发现，即层状杂化钙钛矿的某些部分并非严格的二维电子结构，对于理解这些具有重要技术意义的材料的电子、光学和光电子性质至关重要。
