Speaker: Prof. Ge Ziyi
Date: February 24, 2025 (Monday)
Time: 14:30
Venue: Lecture Hall 1517, Energy Research Institute
Host: Energy Research Institute

Speaker Bio:
Prof. Ziyi Ge is a Second-Level Professor and Doctoral Supervisor at the Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences. He is a recipient of the National Science Fund for Distinguished Young Scholars and a Fellow of the Royal Society of Chemistry (FRSC). He also serves as the Director of the Zhejiang Engineering Research Center for Energy Photoelectronics. His current research primarily focuses on organic/perovskite solar cells and OLEDs. In recent years, he has published over 300 SCI papers in authoritative journals such as Nature Photonics and Chemical Society Reviews, filed more than 60 invention patents, and authored four Chinese and English monographs. He has led numerous projects, including the National Key R&D Program of China (as Chief Scientist), Key Projects of the National Natural Science Foundation of China (NSFC), NSFC Regional Joint Fund Key Projects, and five NSFC General Projects. He received the "China's Significant Achievements in Optics Award" in 2016 and the First Prize of the Zhejiang Provincial Natural Science Award in 2018 and 2022 (ranking first). Prof. Ge was selected as a Global Highly Cited Researcher in 2024. He serves on the editorial boards of eight journals, including Science China Chemistry, and holds positions such as Executive Director of the Zhejiang Society for Materials Research and Conference Chair of the International Conference on Organic Optoelectronics and Materials (ICOOE).

Abstract:
Perovskite solar cells are an emerging solar cell technology that has gained significant attention in recent years. Among them, flexible perovskite solar cells (f-PSCs), known for their high power conversion efficiency (PCE), lightweight, low-temperature processability, inherent flexibility, and compatibility with curved surfaces, show great application potential in areas such as building-integrated photovoltaics, distributed power generation, and wearable electronic devices. This presentation will systematically introduce the fundamental working principles, technical advantages, latest research progress, and commercial potential of f-PSCs. Firstly, by designing and synthesizing two-dimensional ferroelectric materials (3P-yAI), the exciton separation efficiency was improved, achieving an inverted f-PSC with 23% efficiency. A series of cyano derivatives were designed and synthesized to passivate grain boundary defects in perovskites, release residual stress in perovskite films, and enhance their flexibility, resulting in f-PSCs with efficiency exceeding 24%. Furthermore, by filling perovskite grain boundaries with zwitterionic elastomers, nucleation and crystallization were induced and regulated. Utilizing electrostatic interactions between zwitterions, low-temperature repairable flexible films were achieved, leading to the fabrication of flexible perovskite solar cells with 24.5% efficiency. Recently, through the design of a buried interface with a large orientation angle using self-assembled monolayers (SAM), high-quality crystalline growth of the upper perovskite layer was induced, defect density was reduced, and stress was released, achieving a flexible device efficiency of 25.05%—the highest reported efficiency for flexible perovskite solar cells at the time of publication.

All faculty and students are warmly welcome!