Si Suman Kumar, Paria Sarbaranjan, Karan Sumanta Kumar, Ojha Suparna, Das Amit Kumar, Maitra Anirban, Bera Aswini, Halder Lopamudra, De Anurima, Khatua Bhanu Bhusan
Materials Science Centre, Indian Institute of Technology, Kharagpur - 721302, India.
Nanoscale. 2020 Apr 3;12(13):7214-7230. doi: 10.1039/d0nr00090f.
The unique combination of piezoelectric energy harvesters and light detectors progressively strengthens their application in the development of modern electronics. Here, for the first time, we fabricated a polyvinylidene fluoride (PVDF) and formamidinium lead bromide nanoparticle (FAPbBr3 NP)-based composite aerogel film (FAPbBr3/PVDF) for harvesting electrical energy and photodetector applications. The uniform distribution of FAPbBr3 NPs in FAPbBr3/PVDF was achieved via the in situ synthesis of FAPbBr3 NPs in the PVDF matrix, which led to the stabilization of the γ-phase. The freeze-drying process induced an interconnected porous architecture in the composite film, making it more sensitive to small mechanical stimuli. Owing to this unique fabrication technique, the constructed aerogel film-based nanogenerator (FPNG) exhibited an output voltage and current of ∼26.2 V and ∼2.1 μA, respectively, which were 5-fold higher than that of the nanogenerator with the pure PVDF film. Also, the sensitivity of FPNG upon the irradiation of light was demonstrated by the output voltage reduction of ∼38%, indicating its capability as a light sensing device. Furthermore, the prepared FAPbBr3/PVDF composite was found to be an efficient candidate for light detection applications. A simple planar photodetector was fabricated with the 8.0 wt% FAPbBr3 NP-loaded PVDF composite, which displayed very high responsivity (8 A/W) and response speed of 2.6 s. Thus, this exclusive combination of synthesis and fabrication for the preparation of electro-active films opens a new horizon in the piezoelectric community for effective energy harvesting and light detector applications.
压电能量收集器和光探测器的独特组合逐渐增强了它们在现代电子设备开发中的应用。在此，我们首次制备了一种基于聚偏氟乙烯（PVDF）和甲脒铅溴纳米颗粒（FAPbBr3 NP）的复合气凝胶薄膜（FAPbBr3/PVDF），用于收集电能和光探测器应用。通过在PVDF基质中原位合成FAPbBr3 NPs，实现了FAPbBr3 NPs在FAPbBr3/PVDF中的均匀分布，这导致了γ相的稳定。冷冻干燥过程在复合薄膜中诱导出相互连接的多孔结构，使其对小的机械刺激更加敏感。由于这种独特的制造技术，构建的基于气凝胶薄膜的纳米发电机（FPNG）分别表现出约26.2 V和约2.1 μA的输出电压和电流，比纯PVDF薄膜的纳米发电机高出5倍。此外，FPNG在光照下的灵敏度通过约38%的输出电压降低得到证明，表明其作为光传感设备的能力。此外，发现制备的FAPbBr3/PVDF复合材料是光检测应用的有效候选材料。用负载8.0 wt% FAPbBr3 NP的PVDF复合材料制备了一种简单的平面光探测器，其显示出非常高的响应度（8 A/W）和2.6 s的响应速度。因此，这种用于制备电活性薄膜的合成与制造的独特组合为压电领域在有效能量收集和光探测器应用方面开辟了新的视野。
