Recently, The latest research results of Prof. Shulong Longlong and his collaborators from the School of Physics and Materials of the University were published online in the top international journal Physical Review Letters with the title "Flexophotovoltaic effect and above-bandgap photovoltage induced by strain gradients in halide perovskites".
The paper was selected as an Editors' Suggestion article for the current issue (PRL selects no more than 15% of the best articles to be selected as Editors' Suggestions), and also received a Viewpoint feature on the official website of APS Physics, the official website of the American Physical Society (the Viewpoint section represents the highest form of recommendation for the journal). Zhiguo Wang, a full-time postdoctoral fellow at the School of Physics and Materials, is the first author of the paper, and his co-supervisor, Prof. Longlong Shu, is the corresponding author of the paper; Prof. Gustau Catalan of the Instituto Superior de Estudios de Catalunya (ISEC), Spain, is the co-corresponding author of the paper, and Nanchang University is the first and corresponding author of the paper.
Conventional interfacial photovoltaic effects usually require the formation of p-n junctions. In addition to interfacial photovoltaic effects, there exists a special class of photovoltaic effects originating from lattice polarization, i.e., bulk photovoltaic effects, which are usually found in non-centrosymmetric material systems (e.g., ferroelectric photovoltaics). Flexoelectric effect (gradient strain-induced electrode polarization phenomenon) is a new type of force-electric coupling effect that has gradually emerged in the field of functional materials in recent years, which has the advantages of not being constrained by the symmetry of the material and small size effect. The research team of Nanchang University has systematically studied a variety of materials with cubic symmetry, and for the first time verified and experimentally quantified a brand-new bulk photovoltaic effect (flexophotovoltaic effect) induced purely by the flexoelectric effect on the macroscopic scale. Meanwhile, at the micrometer scale, photovoltaic voltage beyond the material bandgap can be realized using the flexoelectric bulk photovoltaic effect. This work demonstrates that the strain gradient-based flexophotovoltaic effect is expected to greatly enhance the photovoltaic performance of photovoltaic materials as a novel technological route.
Prof. Shu Longlong was selected into the National Young Talent Program in 2023, and has undertaken 6 national projects, published more than 30 papers as corresponding author in Nature Materials, PRL and other journals, with more than 2,000 SCI citations, and part of his work has generated a large international influence in the segmented field of flexoelectricity.
原文链接：https://link.aps.org/doi/10.1103/PhysRevLett.132.086902
美国物理学会官网专题报道链接：https://physics.aps.org/articles/v17/27
