Deswal Swati, Panday Rishukumar, Naphade Dipti R, Dixit Prashant, Praveenkumar Balu, Zaręba Jan K, Anthopoulos Thomas D, Ogale Satishchandra, Boomishankar Ramamoorthy
Department of Chemistry and Centre for Energy Science, Indian Institute of Science Education and Research, Pune, Dr. Homi Bhabha Road, Pune, 411008, India.
King Abdullah University of Science and Technology (KAUST), KAUST Solar Center (KSC), Thuwal, 23955-6900, Saudi Arabia.
Chemistry. 2022 Jun 10;28(33):e202200751. doi: 10.1002/chem.202200751. Epub 2022 Apr 28.
Bismuth containing hybrid molecular ferroelectrics are receiving tremendous attention in recent years owing to their stable and non-toxic composition. However, these perovskite-like structures are primarily limited to ammonium cations. Herein, we report a new phosphonium based discrete perovskite-like hybrid ferroelectric with a formula [Me(Ph) P] [Bi Br ] (MTPBB) and its mechanical energy harvesting capability. The Polarization-Electric field (P-E) measurements resulted in a well-defined ferroelectric hysteresis loop with a remnant polarization value of 2.1 μC cm . Piezoresponse force microscopy experiments enabled visualization of the ferroelectric domain structure and evaluation of the piezoelectric strain coefficient (d ) for an MTPBB single crystal and thin film sample. Furthermore, flexible devices incorporating MTPBB in polydimethylsiloxane (PDMS) matrix at various concentrations were fabricated and explored for their mechanical energy harvesting properties. The champion device with 20 wt % of MTPBB in PDMS rendered a maximum peak-to-peak open-circuit voltage of 22.9 V and a maximum power density of 7 μW cm at an optimal load of 4 MΩ. Moreover, the potential of MTPBB-based devices in low power electronics was demonstrated by storing the harvested energy in various electrolytic capacitors.
近年来，含铋杂化分子铁电体因其稳定且无毒的成分而备受关注。然而，这些类钙钛矿结构主要局限于铵阳离子。在此，我们报道了一种新型的基于鏻的离散类钙钛矿杂化铁电体，其化学式为[Me(Ph)₃P][BiBr₄]（MTPBB）及其机械能收集能力。极化 - 电场（P - E）测量得到了一个明确的铁电滞回环，剩余极化值为2.1 μC/cm²。压电力显微镜实验能够观察到MTPBB单晶和薄膜样品的铁电畴结构，并评估其压电应变系数（d₃₃）。此外，制备了在聚二甲基硅氧烷（PDMS）基质中以不同浓度掺入MTPBB的柔性器件，并研究了它们的机械能收集特性。在PDMS中含有20 wt% MTPBB的最佳器件在4 MΩ的最佳负载下呈现出22.9 V的最大峰 - 峰开路电压和7 μW/cm²的最大功率密度。此外，通过将收集到的能量存储在各种电解电容器中，展示了基于MTPBB的器件在低功耗电子学中的潜力。
