AI Article Synopsis
- - Ge-based hybrid perovskite materials are promising for second harmonic generation (SHG) due to their unique non-centrosymmetric structures from geometry and lone-pair effects.
- - A new family of 3D Ge-based bromide perovskites (AGeBr) has been identified, with specific compounds like MAGeBr showing significantly enhanced SHG intensity, outperforming potassium dihydrogen phosphate.
- - The improved SHG responses are linked to the displacement of Ge atoms and strong interactions between Ge's lone pair electrons and polar cations, offering valuable insights for future material design.
Article Abstract
Ge-based hybrid perovskite materials have demonstrated great potential for second harmonic generation (SHG) due to the geometry and lone-pair induced non-centrosymmetric structures. Here, we report a new family of hybrid 3D Ge-based bromide perovskites AGeBr , A=CH NH (MA), CH(NH ) (FA), Cs and FAGe Sn Br , crystallizing in polar space groups. These compounds exhibit tunable SHG responses, where MAGeBr shows the strongest SHG intensity (5×potassium dihydrogen phosphate, KDP). Structural and theoretical analysis indicate the high SHG efficiency is attributed to the displacement of Ge along [111] direction and the relatively strong interactions between lone pair electrons of Ge and polar MA cations along the c-axis. This work provides new structural insights for designing and fine-tuning the SHG properties in hybrid metal halide materials.
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| http://dx.doi.org/10.1002/anie.202208875 | DOI Listing |
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