On April 9th, it was reported that Professor Tang Yuanyuan from the International Institute of Ordered Materials Science at Nanchang University and researchers from Southeast University and other institutions have collaborated to prepare biodegradable ferroelectric molecular crystals with high piezoelectric response. This achievement not only provides potential candidate materials for transient implantable electronic medical devices, but also opens up new important exports for the application of molecular piezoelectric materials in the field of human health. The relevant research results were recently published in Science. Currently, people's demand for medical and health care is becoming increasingly strong. The research on implantable piezoelectric biomedical devices is flourishing, which is expected to help people improve their quality of life. At present, the mainstream materials for piezoelectric applications mainly include inorganic ferroelectric ceramics and ferroelectric polymers. However, a significant issue with these traditional materials is their non biodegradability. This means that when implantable electronic devices made of these materials are applied to the human body, a second surgery is required to remove them. This undoubtedly increases the risk and inconvenience for patients. In contrast, the synthesis of ferroelectric molecular crystals is simple and easy to process, while possessing lightweight, good biocompatibility, and controllable physical properties. Therefore, ferroelectric molecular crystals are considered an ideal candidate material for implantable transient piezoelectric devices. However, currently there are few biodegradable ferroelectric molecular crystals on the market, and the piezoelectric performance is not satisfactory. The research team has developed a ferroelectric molecular crystal (HFPD), which has increased the piezoelectric performance of small molecules by four times, playing a crucial role. HFPD can easily dissolve in various solvents, especially body fluids, which is extremely beneficial for its degradation process in organisms. In addition, HFPD also exhibits good biosafety, biocompatibility, and biodegradability, which provides broad prospects for its application in the field of biomedicine. Considering the brittleness and rigidity of the crystal, the team prepared HFPD polyvinyl alcohol flexible piezoelectric composite films by solution evaporation method. Based on this piezoelectric composite thin film, the team successfully assembled a controllable transient electromechanical device and confirmed its excellent biosensing performance. (Lai Xin She)