2D Inorganic Bimolecular Crystals with Strong In‐Plane Anisotropy for Second‐Order Nonlinear Optics
Xinliang Feng, Zongdong Sun, Ke Pei, Wei Han, Fakun Wang, Peng Luo, Jianwei Su, Nian Zuo, Guiheng Liu, Huiqiao Li, Tianyou Zhai
Abstract
Abstract 2D inorganic bimolecular crystals, consisting of two different inorganic molecules, are expected to possess novel physical and chemical properties due to the synergistic effect of the individual components. However, 2D inorganic bimolecular crystals remain unexploited because of the difficulties in preparation arising from non‐typical layered structures and intricate intermolecular interactions. Here, the synthesis of 2D inorganic bimolecular crystal SbI 3 ·3S 8 nanobelts via a facile vertical microspacing sublimation strategy is reported. The as‐synthesized SbI 3 ·3S 8 nanobelts exhibit strong in‐plane anisotropy of phonon vibrations and intramolecular vibrations as well as show anisotropic light absorption with a high dichroism ratio of 3.9. Furthermore, it is revealed that the second harmonic generation intensity of SbI 3 ·3S 8 nanobelts is highly dependent on the excitation wavelength and crystallographic orientation. This work can inspire the growth of more 2D inorganic bimolecular crystals and excite potential applications for bimolecular optoelectronic devices.