With the aid of Enlitech’s automated inspection software, which ensures accurate and rapid detection of IPCE (Incident Photon to Current Efficiency), IQE (Internal Quantum Efficiency), and spectral response data, the quantum efficiency results obtained from the QE-R system have been widely adopted and referenced by high-impact factor journals.

Prof. Rupak Banerjee’s team synthesized Cs2SnX6 nanostructures through a solvothermal method and mixed them with PVDF to produce composite films. They found that the addition of Cs2SnX6 enhanced the electrical activity phase in PVDF, thereby improving the piezoelectric performance of the composite films. First-principles density functional theory (DFT) calculations were also employed to analyze the interface interaction between Cs2SnX6 and PVDF, revealing a physical adsorption mechanism between the perovskite and PVDF, leading to enhanced piezoelectric response. The researchers systematically varied the halide ions in the inorganic Cs2SnX6 perovskite and studied the corresponding piezoelectric behavior of the PENGs. Additionally, they measured the dielectric properties, piezoelectric response amplitude, piezoelectric output signal, and charging capacity of these halide perovskite-based mixtures.

Among the various prepared films, the optimized Cs2SnI6_PVDF film exhibited the highest piezoelectric coefficient (d33) value of approximately 200 pm V–1, and a residual polarization of about 0.74 μC cm–2 was obtained from piezo-force microscopy and polarization hysteresis curve measurements. The optimized Cs2SnI6_PVDF-based device generated an instantaneous output voltage of around 167 V, a current of approximately 5.0 μA, and a power of about 835 μW when subjected to periodic vertical compression. The output voltage of the device was used to charge a 10 μF capacitor, which reached a voltage of 2.2 V and was able to drive some commercial LEDs. In addition to being used as a pressure sensor, the device was also employed to monitor human physiological activities. The device demonstrated excellent operational durability in the environment, showcasing its outstanding potential for mechanical energy harvesting and pressure sensing applications.

This research provides a new approach for developing lead-free halide perovskite materials and offers an effective method for utilizing biomechanical energy to drive wearable devices and self-powered systems. The research team expressed their intention to continue optimizing the performance of these materials and devices, as well as exploring further application scenarios.