As a clean and renewable energy, solar energy has drawn people’s attention to mitigate the energy crisis around the world. A solar photovoltaic (PV) system is a reliable way to collect solar energy whose service lifetime is usually shorter than the designed time because of accumulated charge-induced degradation caused by electrical aging. With the rapid development of PV systems, the traditional polyethylene terephthalate (PET) backsheet cannot meet the requirements of insulation and package for the advanced solar energy system. In this context, two different backsheet materials, namely, KPK (polyvinylidene fluoride, PET, polyvinylidene fluoride) and TPT (polyvinyl fluoride, PET, polyvinyl fluoride), were selected to explore accumulated charge-induced degradation caused by partial discharge (PD) and corona discharge. In this paper, the backsheets were electrically stressed for 30, 60, and 120 min by PD and electrically stressed for 10 min by corona discharge. The accumulation and transportation of charges were investigated by phase-resolved partial discharge (PRPD) and surface potential decay (SPD). At the same time, the topography of KPK and TPT determined using atomic force microscopy after PD activity was also investigated. The explorations of PD activity showed that KPK and TPT have a similar PD resistance, but their SPD were entirely different after corona discharge. The research works in this paper provide an important path to investigate the aging process of insulating polymers and evaluate the lifetime of insulating backsheets of PV modules, as well as a guidance to improve the testing standards for the PV system.

High power consumption of nonvolatile memory is a major challenge, as it reduces the memory efficiency of information storage devices. The magnetoelectric (ME) coupling in multiferroic nanocomposites, which can be utilized in magnetoelectric random access memory, is an effective approach to reduce power consumption in information storage. Here, a type of ME nanocomposite embedded with 0.5 wt % Fe3O4 is presented, exhibiting higher ME voltage coefficients for piezoelectric thin films. Specifically, the ME voltage coefficient of the P(VDF-TrFE)/Fe3O4 composite developed in this study is 8.97 mV/(cm·Oe), which is 17.5% higher compared to that of the pure P(VDF-TrFE) at a H dc of 1000 Oe. Meanwhile, the enhanced ME effect of smart nanocomposites is characterized by the increase of diffraction peak intensity at a microscopic level. The nanocomposite films exhibit high ME voltage coefficients and information storage performance, providing a great potential for creating next-generation memory devices in the realm of artificial intelligence and wearable devices.

Driven by the development of internet technology, higher requirements on information materials and data storage devices were demanded. To improve the work efficiency and performance of the new generation of information materials and data storage devices, the magnetoelectric (ME) coupling and storage mechanism of magnetoelectric composites deserve more attention. Here, we explored the influence of applied magnetic fields on the output voltage on a metal–insulation–metal (MIM) sandwich composite for realizing the magnetoelectric memory by experiments and modeling. It is found that the DC magnetic field ( H dc ) and the output voltage of the polyvinylidene fluoride film are linearly correlated. At a frequency of 1 kHz, the magnetoelectric voltage coefficient is 60.71 mV cm –1 Oe –1 , which is evidently larger than that of other film materials. From this work, we can conclude that the MIM sandwich composite could generate higher magnetoelectric voltage under the AC magnetic field ( H ac ) with higher frequency, which could be used as the magnetoelectric memory device, and provides significant support for improving the performance of magnetoelectric memory devices and the whole internet system.

Flexible solar wings with high energy density, lightweight, small size and large deployment area are one of the first choices for next‐generation spacecraft. However, the flexible solar wings are subjected to irradiation in space and tensile mechanical stress, which produce the charge accumulation effect and result in electrostatic discharge. It is necessary to establish a test method for the conductivity and space charge behaviour of polyimide under tensile stress. The stress–strain characteristics of polyimide under different tensile stresses are studied by the authors. The longitudinal length‐strain characteristics and transverse thickness evolution characteristics under different stresses are also obtained. The results show that the variation of film thickness with tensile force is only about 1% before the yield point. The polyimide films from 50 to 200 μm thick have similar yield and tensile strengths. The ultimate stress of the specimen decreases from approximately 126 to 103 MPa with increasing thickness. The thickness model of polyimide under tensile stress were obtained, which could accurately calculate the voltage amplitude applied on the specimens for measuring the conductivity under different tensile stresses. A basis for investigating the stress–strain characteristics of polyimide films under different tensile stresses are provided, which will facilitate the formulation selection and performance improvement of polyimide for flexible solar wings of spacecraft.

Smart sensors with excellent performance are accelerating the development of biomedicine and the Internet of Energy. Nanodielectrics exhibit unique electrical and mechanical properties. As the predominant materials in optical magnetic field sensor (MFS), they can not only exert the anti‐interference of optical sensing, but improve the measuring characteristics of optical sensors. For instance, the optical fibre quantum probe for the magnetic field can obtain a higher sensitivity of 0.57 nT/Hz1/2, while the measurement range of the sensor that uses Co‐doped ZnO nanorods as cladding is 17–180 mT. Here, these exciting recent achievements in the realm of optical sensing methods for magnetic field detection are reviewed, with a focus on nanodielectrics, which provide an emerging opportunity to achieve higher sensitivity and a wider measurement range of MFS.